* do instructions or hints to the planner using C-style block comments
* of the SQL.
*
- * Copyright (c) 2012, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2013, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
+#include "catalog/pg_collation.h"
+#include "catalog/pg_index.h"
#include "commands/prepare.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "optimizer/restrictinfo.h"
#include "parser/scansup.h"
#include "tcop/utility.h"
+#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
+#include "utils/rel.h"
+#include "utils/syscache.h"
+#if PG_VERSION_NUM >= 90200
+#include "catalog/pg_class.h"
+#endif
+
+#include "executor/spi.h"
+#include "catalog/pg_type.h"
+/*
+ * We have our own header file "plpgsql-9.1", which is necessary to support
+ * hints for queries in PL/pgSQL blocks, in pg_hint_plan source package,
+ * because PostgreSQL 9.1 doesn't provide the header file as a part of
+ * installation. This header file is a copy of src/pl/plpgsql/src/plpgsql.h in
+ * PostgreSQL 9.1.9 source tree,
+ *
+ * On the other hand, 9.2 installation provides that header file for external
+ * modules, so we include the header in ordinary place.
+ */
+#if PG_VERSION_NUM >= 90200
+#include "plpgsql.h"
+#else
+#include "plpgsql-9.1.h"
+#endif
+
+/* partially copied from pg_stat_statements */
+#include "normalize_query.h"
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
/* hint keywords */
#define HINT_SEQSCAN "SeqScan"
#define HINT_INDEXSCAN "IndexScan"
+#define HINT_INDEXSCANREGEXP "IndexScanRegexp"
#define HINT_BITMAPSCAN "BitmapScan"
+#define HINT_BITMAPSCANREGEXP "BitmapScanRegexp"
#define HINT_TIDSCAN "TidScan"
#define HINT_NOSEQSCAN "NoSeqScan"
#define HINT_NOINDEXSCAN "NoIndexScan"
#define HINT_NOBITMAPSCAN "NoBitmapScan"
#define HINT_NOTIDSCAN "NoTidScan"
+#if PG_VERSION_NUM >= 90200
+#define HINT_INDEXONLYSCAN "IndexOnlyScan"
+#define HINT_INDEXONLYSCANREGEXP "IndexOnlyScanRegexp"
+#define HINT_NOINDEXONLYSCAN "NoIndexOnlyScan"
+#endif
#define HINT_NESTLOOP "NestLoop"
#define HINT_MERGEJOIN "MergeJoin"
#define HINT_HASHJOIN "HashJoin"
#define HINT_ARRAY_DEFAULT_INITSIZE 8
-#define parse_ereport(str, detail) \
+#define hint_ereport(str, detail) \
ereport(pg_hint_plan_parse_messages, \
(errmsg("hint syntax error at or near \"%s\"", (str)), \
errdetail detail))
ENABLE_INDEXSCAN = 0x02,
ENABLE_BITMAPSCAN = 0x04,
ENABLE_TIDSCAN = 0x08,
+#if PG_VERSION_NUM >= 90200
+ ENABLE_INDEXONLYSCAN = 0x10
+#endif
} SCAN_TYPE_BITS;
enum
ENABLE_HASHJOIN = 0x04
} JOIN_TYPE_BITS;
-#define ENABLE_ALL_SCAN (ENABLE_SEQSCAN | ENABLE_INDEXSCAN | ENABLE_BITMAPSCAN \
- | ENABLE_TIDSCAN)
+#if PG_VERSION_NUM >= 90200
+#define ENABLE_ALL_SCAN (ENABLE_SEQSCAN | ENABLE_INDEXSCAN | \
+ ENABLE_BITMAPSCAN | ENABLE_TIDSCAN | \
+ ENABLE_INDEXONLYSCAN)
+#else
+#define ENABLE_ALL_SCAN (ENABLE_SEQSCAN | ENABLE_INDEXSCAN | \
+ ENABLE_BITMAPSCAN | ENABLE_TIDSCAN)
+#endif
#define ENABLE_ALL_JOIN (ENABLE_NESTLOOP | ENABLE_MERGEJOIN | ENABLE_HASHJOIN)
#define DISABLE_ALL_SCAN 0
#define DISABLE_ALL_JOIN 0
+/* hint keyword of enum type*/
+typedef enum HintKeyword
+{
+ HINT_KEYWORD_SEQSCAN,
+ HINT_KEYWORD_INDEXSCAN,
+ HINT_KEYWORD_INDEXSCANREGEXP,
+ HINT_KEYWORD_BITMAPSCAN,
+ HINT_KEYWORD_BITMAPSCANREGEXP,
+ HINT_KEYWORD_TIDSCAN,
+ HINT_KEYWORD_NOSEQSCAN,
+ HINT_KEYWORD_NOINDEXSCAN,
+ HINT_KEYWORD_NOBITMAPSCAN,
+ HINT_KEYWORD_NOTIDSCAN,
+#if PG_VERSION_NUM >= 90200
+ HINT_KEYWORD_INDEXONLYSCAN,
+ HINT_KEYWORD_INDEXONLYSCANREGEXP,
+ HINT_KEYWORD_NOINDEXONLYSCAN,
+#endif
+ HINT_KEYWORD_NESTLOOP,
+ HINT_KEYWORD_MERGEJOIN,
+ HINT_KEYWORD_HASHJOIN,
+ HINT_KEYWORD_NONESTLOOP,
+ HINT_KEYWORD_NOMERGEJOIN,
+ HINT_KEYWORD_NOHASHJOIN,
+ HINT_KEYWORD_LEADING,
+ HINT_KEYWORD_SET,
+ HINT_KEYWORD_UNRECOGNIZED
+} HintKeyword;
+
typedef struct Hint Hint;
-typedef struct PlanHint PlanHint;
+typedef struct HintState HintState;
typedef Hint *(*HintCreateFunction) (const char *hint_str,
- const char *keyword);
+ const char *keyword,
+ HintKeyword hint_keyword);
typedef void (*HintDeleteFunction) (Hint *hint);
-typedef void (*HintDumpFunction) (Hint *hint, StringInfo buf);
+typedef void (*HintDescFunction) (Hint *hint, StringInfo buf);
typedef int (*HintCmpFunction) (const Hint *a, const Hint *b);
-typedef const char *(*HintParseFunction) (Hint *hint, PlanHint *plan,
+typedef const char *(*HintParseFunction) (Hint *hint, HintState *hstate,
Query *parse, const char *str);
/* hint types */
HINT_TYPE_SET
} HintType;
+static const char *HintTypeName[] = {
+ "scan method",
+ "join method",
+ "leading",
+ "set"
+};
+
/* hint status */
typedef enum HintStatus
{
{
const char *hint_str; /* must not do pfree */
const char *keyword; /* must not do pfree */
+ HintKeyword hint_keyword;
HintType type;
HintStatus state;
HintDeleteFunction delete_func;
- HintDumpFunction dump_func;
+ HintDescFunction desc_func;
HintCmpFunction cmp_func;
- HintParseFunction parser_func;
+ HintParseFunction parse_func;
};
/* scan method hints */
Hint base;
char *relname;
List *indexnames;
+ bool regexp;
unsigned char enforce_mask;
} ScanMethodHint;
+typedef struct ParentIndexInfo
+{
+ bool indisunique;
+ Oid method;
+ List *column_names;
+ char *expression_str;
+ Oid *indcollation;
+ Oid *opclass;
+ int16 *indoption;
+ char *indpred_str;
+} ParentIndexInfo;
+
/* join method hints */
typedef struct JoinMethodHint
{
Hint base;
int nrels;
+ int inner_nrels;
char **relnames;
unsigned char enforce_mask;
Relids joinrelids;
+ Relids inner_joinrelids;
} JoinMethodHint;
/* join order hints */
+typedef struct OuterInnerRels
+{
+ char *relation;
+ List *outer_inner_pair;
+} OuterInnerRels;
+
typedef struct LeadingHint
{
- Hint base;
- List *relations; /* relation names specified in Leading hint */
+ Hint base;
+ List *relations; /* relation names specified in Leading hint */
+ OuterInnerRels *outer_inner;
} LeadingHint;
/* change a run-time parameter hints */
Hint base;
char *name; /* name of variable */
char *value;
+ List *words;
} SetHint;
/*
* Describes a context of hint processing.
*/
-struct PlanHint
+struct HintState
{
char *hint_str; /* original hint string */
ScanMethodHint **scan_hints; /* parsed scan hints */
int init_scan_mask; /* initial value scan parameter */
Index parent_relid; /* inherit parent table relid */
+ Oid parent_rel_oid; /* inherit parent table relid */
ScanMethodHint *parent_hint; /* inherit parent table scan hint */
+ List *parent_index_infos; /* information of inherit parent table's
+ * index */
/* for join method hints */
JoinMethodHint **join_hints; /* parsed join hints */
List **join_hint_level;
/* for Leading hint */
- LeadingHint *leading_hint; /* parsed last specified Leading hint */
+ LeadingHint **leading_hint; /* parsed Leading hints */
/* for Set hints */
SetHint **set_hints; /* parsed Set hints */
{
char *keyword;
HintCreateFunction create_func;
+ HintKeyword hint_keyword;
} HintParser;
/* Module callbacks */
void _PG_init(void);
void _PG_fini(void);
-static void push_hint(PlanHint *plan);
+static void push_hint(HintState *hstate);
static void pop_hint(void);
static void pg_hint_plan_ProcessUtility(Node *parsetree,
int levels_needed,
List *initial_rels);
-static Hint *ScanMethodHintCreate(const char *hint_str, const char *keyword);
+static Hint *ScanMethodHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword);
static void ScanMethodHintDelete(ScanMethodHint *hint);
-static void ScanMethodHintDump(ScanMethodHint *hint, StringInfo buf);
+static void ScanMethodHintDesc(ScanMethodHint *hint, StringInfo buf);
static int ScanMethodHintCmp(const ScanMethodHint *a, const ScanMethodHint *b);
-static const char *ScanMethodHintParse(ScanMethodHint *hint, PlanHint *plan,
+static const char *ScanMethodHintParse(ScanMethodHint *hint, HintState *hstate,
Query *parse, const char *str);
-static Hint *JoinMethodHintCreate(const char *hint_str, const char *keyword);
+static Hint *JoinMethodHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword);
static void JoinMethodHintDelete(JoinMethodHint *hint);
-static void JoinMethodHintDump(JoinMethodHint *hint, StringInfo buf);
+static void JoinMethodHintDesc(JoinMethodHint *hint, StringInfo buf);
static int JoinMethodHintCmp(const JoinMethodHint *a, const JoinMethodHint *b);
-static const char *JoinMethodHintParse(JoinMethodHint *hint, PlanHint *plan,
+static const char *JoinMethodHintParse(JoinMethodHint *hint, HintState *hstate,
Query *parse, const char *str);
-static Hint *LeadingHintCreate(const char *hint_str, const char *keyword);
+static Hint *LeadingHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword);
static void LeadingHintDelete(LeadingHint *hint);
-static void LeadingHintDump(LeadingHint *hint, StringInfo buf);
+static void LeadingHintDesc(LeadingHint *hint, StringInfo buf);
static int LeadingHintCmp(const LeadingHint *a, const LeadingHint *b);
-static const char *LeadingHintParse(LeadingHint *hint, PlanHint *plan,
+static const char *LeadingHintParse(LeadingHint *hint, HintState *hstate,
Query *parse, const char *str);
-static Hint *SetHintCreate(const char *hint_str, const char *keyword);
+static Hint *SetHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword);
static void SetHintDelete(SetHint *hint);
-static void SetHintDump(SetHint *hint, StringInfo buf);
+static void SetHintDesc(SetHint *hint, StringInfo buf);
static int SetHintCmp(const SetHint *a, const SetHint *b);
-static const char *SetHintParse(SetHint *hint, PlanHint *plan, Query *parse,
+static const char *SetHintParse(SetHint *hint, HintState *hstate, Query *parse,
const char *str);
+static void quote_value(StringInfo buf, const char *value);
+
+static const char *parse_quoted_value(const char *str, char **word,
+ bool truncate);
+
RelOptInfo *pg_hint_plan_standard_join_search(PlannerInfo *root,
int levels_needed,
List *initial_rels);
static bool has_join_restriction(PlannerInfo *root, RelOptInfo *rel);
static void set_append_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
Index rti, RangeTblEntry *rte);
+#if PG_VERSION_NUM >= 90200
+static void generate_mergeappend_paths(PlannerInfo *root, RelOptInfo *rel,
+ List *live_childrels,
+ List *all_child_pathkeys);
+#endif
static List *accumulate_append_subpath(List *subpaths, Path *path);
+#if PG_VERSION_NUM < 90200
static void set_dummy_rel_pathlist(RelOptInfo *rel);
+#endif
RelOptInfo *pg_hint_plan_make_join_rel(PlannerInfo *root, RelOptInfo *rel1,
RelOptInfo *rel2);
+static void pg_hint_plan_plpgsql_stmt_beg(PLpgSQL_execstate *estate,
+ PLpgSQL_stmt *stmt);
+static void pg_hint_plan_plpgsql_stmt_end(PLpgSQL_execstate *estate,
+ PLpgSQL_stmt *stmt);
+
/* GUC variables */
-static bool pg_hint_plan_enable = true;
+static bool pg_hint_plan_enable_hint = true;
static bool pg_hint_plan_debug_print = false;
static int pg_hint_plan_parse_messages = INFO;
+/* Default is off, to keep backward compatibility. */
+static bool pg_hint_plan_enable_hint_table = false;
static const struct config_enum_entry parse_messages_level_options[] = {
{"debug", DEBUG2, true},
static get_relation_info_hook_type prev_get_relation_info = NULL;
static join_search_hook_type prev_join_search = NULL;
-/* フック関数をまたがって使用する情報を管理する */
-static PlanHint *current_hint = NULL;
+/* Hold reference to currently active hint */
+static HintState *current_hint = NULL;
-/* 有効なヒントをスタック構造で管理する */
-static List *PlanHintStack = NIL;
+/*
+ * List of hint contexts. We treat the head of the list as the Top of the
+ * context stack, so current_hint always points the first element of this list.
+ */
+static List *HintStateStack = NIL;
/*
- * EXECUTEコマンド実行時に、ステートメント名を格納する。
- * その他のコマンドの場合は、NULLに設定する。
+ * Holds statement name during executing EXECUTE command. NULL for other
+ * statements.
*/
static char *stmt_name = NULL;
static const HintParser parsers[] = {
- {HINT_SEQSCAN, ScanMethodHintCreate},
- {HINT_INDEXSCAN, ScanMethodHintCreate},
- {HINT_BITMAPSCAN, ScanMethodHintCreate},
- {HINT_TIDSCAN, ScanMethodHintCreate},
- {HINT_NOSEQSCAN, ScanMethodHintCreate},
- {HINT_NOINDEXSCAN, ScanMethodHintCreate},
- {HINT_NOBITMAPSCAN, ScanMethodHintCreate},
- {HINT_NOTIDSCAN, ScanMethodHintCreate},
- {HINT_NESTLOOP, JoinMethodHintCreate},
- {HINT_MERGEJOIN, JoinMethodHintCreate},
- {HINT_HASHJOIN, JoinMethodHintCreate},
- {HINT_NONESTLOOP, JoinMethodHintCreate},
- {HINT_NOMERGEJOIN, JoinMethodHintCreate},
- {HINT_NOHASHJOIN, JoinMethodHintCreate},
- {HINT_LEADING, LeadingHintCreate},
- {HINT_SET, SetHintCreate},
- {NULL, NULL}
+ {HINT_SEQSCAN, ScanMethodHintCreate, HINT_KEYWORD_SEQSCAN},
+ {HINT_INDEXSCAN, ScanMethodHintCreate, HINT_KEYWORD_INDEXSCAN},
+ {HINT_INDEXSCANREGEXP, ScanMethodHintCreate, HINT_KEYWORD_INDEXSCANREGEXP},
+ {HINT_BITMAPSCAN, ScanMethodHintCreate, HINT_KEYWORD_BITMAPSCAN},
+ {HINT_BITMAPSCANREGEXP, ScanMethodHintCreate,
+ HINT_KEYWORD_BITMAPSCANREGEXP},
+ {HINT_TIDSCAN, ScanMethodHintCreate, HINT_KEYWORD_TIDSCAN},
+ {HINT_NOSEQSCAN, ScanMethodHintCreate, HINT_KEYWORD_NOSEQSCAN},
+ {HINT_NOINDEXSCAN, ScanMethodHintCreate, HINT_KEYWORD_NOINDEXSCAN},
+ {HINT_NOBITMAPSCAN, ScanMethodHintCreate, HINT_KEYWORD_NOBITMAPSCAN},
+ {HINT_NOTIDSCAN, ScanMethodHintCreate, HINT_KEYWORD_NOTIDSCAN},
+#if PG_VERSION_NUM >= 90200
+ {HINT_INDEXONLYSCAN, ScanMethodHintCreate, HINT_KEYWORD_INDEXONLYSCAN},
+ {HINT_INDEXONLYSCANREGEXP, ScanMethodHintCreate,
+ HINT_KEYWORD_INDEXONLYSCANREGEXP},
+ {HINT_NOINDEXONLYSCAN, ScanMethodHintCreate, HINT_KEYWORD_NOINDEXONLYSCAN},
+#endif
+ {HINT_NESTLOOP, JoinMethodHintCreate, HINT_KEYWORD_NESTLOOP},
+ {HINT_MERGEJOIN, JoinMethodHintCreate, HINT_KEYWORD_MERGEJOIN},
+ {HINT_HASHJOIN, JoinMethodHintCreate, HINT_KEYWORD_HASHJOIN},
+ {HINT_NONESTLOOP, JoinMethodHintCreate, HINT_KEYWORD_NONESTLOOP},
+ {HINT_NOMERGEJOIN, JoinMethodHintCreate, HINT_KEYWORD_NOMERGEJOIN},
+ {HINT_NOHASHJOIN, JoinMethodHintCreate, HINT_KEYWORD_NOHASHJOIN},
+ {HINT_LEADING, LeadingHintCreate, HINT_KEYWORD_LEADING},
+ {HINT_SET, SetHintCreate, HINT_KEYWORD_SET},
+ {NULL, NULL, HINT_KEYWORD_UNRECOGNIZED}
+};
+
+/*
+ * PL/pgSQL plugin for retrieving string representation of each query during
+ * function execution.
+ */
+const char *plpgsql_query_string = NULL;
+PLpgSQL_plugin plugin_funcs = {
+ NULL,
+ NULL,
+ NULL,
+ pg_hint_plan_plpgsql_stmt_beg,
+ pg_hint_plan_plpgsql_stmt_end,
+ NULL,
+ NULL,
};
+/* Current nesting depth of SPI calls, used to prevent recursive calls */
+static int nested_level = 0;
+
/*
* Module load callbacks
*/
void
_PG_init(void)
{
+ PLpgSQL_plugin **var_ptr;
+
/* Define custom GUC variables. */
- DefineCustomBoolVariable("pg_hint_plan.enable",
+ DefineCustomBoolVariable("pg_hint_plan.enable_hint",
"Force planner to use plans specified in the hint comment preceding to the query.",
NULL,
- &pg_hint_plan_enable,
+ &pg_hint_plan_enable_hint,
true,
PGC_USERSET,
0,
NULL);
DefineCustomEnumVariable("pg_hint_plan.parse_messages",
- "Messege level of parse errors.",
+ "Message level of parse errors.",
NULL,
&pg_hint_plan_parse_messages,
INFO,
NULL,
NULL);
+ DefineCustomBoolVariable("pg_hint_plan.enable_hint_table",
+ "Force planner to not get hint by using table lookups.",
+ NULL,
+ &pg_hint_plan_enable_hint_table,
+ false,
+ PGC_USERSET,
+ 0,
+ NULL,
+ NULL,
+ NULL);
+
/* Install hooks. */
prev_ProcessUtility = ProcessUtility_hook;
ProcessUtility_hook = pg_hint_plan_ProcessUtility;
get_relation_info_hook = pg_hint_plan_get_relation_info;
prev_join_search = join_search_hook;
join_search_hook = pg_hint_plan_join_search;
+
+ /* setup PL/pgSQL plugin hook */
+ var_ptr = (PLpgSQL_plugin **) find_rendezvous_variable("PLpgSQL_plugin");
+ *var_ptr = &plugin_funcs;
}
/*
void
_PG_fini(void)
{
+ PLpgSQL_plugin **var_ptr;
+
/* Uninstall hooks. */
ProcessUtility_hook = prev_ProcessUtility;
planner_hook = prev_planner;
get_relation_info_hook = prev_get_relation_info;
join_search_hook = prev_join_search;
+
+ /* uninstall PL/pgSQL plugin hook */
+ var_ptr = (PLpgSQL_plugin **) find_rendezvous_variable("PLpgSQL_plugin");
+ *var_ptr = NULL;
}
/*
*/
static Hint *
-ScanMethodHintCreate(const char *hint_str, const char *keyword)
+ScanMethodHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword)
{
ScanMethodHint *hint;
hint = palloc(sizeof(ScanMethodHint));
hint->base.hint_str = hint_str;
hint->base.keyword = keyword;
+ hint->base.hint_keyword = hint_keyword;
hint->base.type = HINT_TYPE_SCAN_METHOD;
hint->base.state = HINT_STATE_NOTUSED;
hint->base.delete_func = (HintDeleteFunction) ScanMethodHintDelete;
- hint->base.dump_func = (HintDumpFunction) ScanMethodHintDump;
+ hint->base.desc_func = (HintDescFunction) ScanMethodHintDesc;
hint->base.cmp_func = (HintCmpFunction) ScanMethodHintCmp;
- hint->base.parser_func = (HintParseFunction) ScanMethodHintParse;
+ hint->base.parse_func = (HintParseFunction) ScanMethodHintParse;
hint->relname = NULL;
hint->indexnames = NIL;
+ hint->regexp = false;
hint->enforce_mask = 0;
return (Hint *) hint;
}
static Hint *
-JoinMethodHintCreate(const char *hint_str, const char *keyword)
+JoinMethodHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword)
{
JoinMethodHint *hint;
hint = palloc(sizeof(JoinMethodHint));
hint->base.hint_str = hint_str;
hint->base.keyword = keyword;
+ hint->base.hint_keyword = hint_keyword;
hint->base.type = HINT_TYPE_JOIN_METHOD;
hint->base.state = HINT_STATE_NOTUSED;
hint->base.delete_func = (HintDeleteFunction) JoinMethodHintDelete;
- hint->base.dump_func = (HintDumpFunction) JoinMethodHintDump;
+ hint->base.desc_func = (HintDescFunction) JoinMethodHintDesc;
hint->base.cmp_func = (HintCmpFunction) JoinMethodHintCmp;
- hint->base.parser_func = (HintParseFunction) JoinMethodHintParse;
+ hint->base.parse_func = (HintParseFunction) JoinMethodHintParse;
hint->nrels = 0;
+ hint->inner_nrels = 0;
hint->relnames = NULL;
hint->enforce_mask = 0;
hint->joinrelids = NULL;
+ hint->inner_joinrelids = NULL;
return (Hint *) hint;
}
pfree(hint->relnames[i]);
pfree(hint->relnames);
}
+
bms_free(hint->joinrelids);
+ bms_free(hint->inner_joinrelids);
pfree(hint);
}
static Hint *
-LeadingHintCreate(const char *hint_str, const char *keyword)
+LeadingHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword)
{
LeadingHint *hint;
hint = palloc(sizeof(LeadingHint));
hint->base.hint_str = hint_str;
hint->base.keyword = keyword;
+ hint->base.hint_keyword = hint_keyword;
hint->base.type = HINT_TYPE_LEADING;
hint->base.state = HINT_STATE_NOTUSED;
hint->base.delete_func = (HintDeleteFunction)LeadingHintDelete;
- hint->base.dump_func = (HintDumpFunction) LeadingHintDump;
+ hint->base.desc_func = (HintDescFunction) LeadingHintDesc;
hint->base.cmp_func = (HintCmpFunction) LeadingHintCmp;
- hint->base.parser_func = (HintParseFunction) LeadingHintParse;
+ hint->base.parse_func = (HintParseFunction) LeadingHintParse;
hint->relations = NIL;
+ hint->outer_inner = NULL;
return (Hint *) hint;
}
return;
list_free_deep(hint->relations);
+ if (hint->outer_inner)
+ pfree(hint->outer_inner);
pfree(hint);
}
static Hint *
-SetHintCreate(const char *hint_str, const char *keyword)
+SetHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword)
{
SetHint *hint;
hint = palloc(sizeof(SetHint));
hint->base.hint_str = hint_str;
hint->base.keyword = keyword;
+ hint->base.hint_keyword = hint_keyword;
hint->base.type = HINT_TYPE_SET;
hint->base.state = HINT_STATE_NOTUSED;
hint->base.delete_func = (HintDeleteFunction) SetHintDelete;
- hint->base.dump_func = (HintDumpFunction) SetHintDump;
+ hint->base.desc_func = (HintDescFunction) SetHintDesc;
hint->base.cmp_func = (HintCmpFunction) SetHintCmp;
- hint->base.parser_func = (HintParseFunction) SetHintParse;
+ hint->base.parse_func = (HintParseFunction) SetHintParse;
hint->name = NULL;
hint->value = NULL;
+ hint->words = NIL;
return (Hint *) hint;
}
pfree(hint->name);
if (hint->value)
pfree(hint->value);
+ if (hint->words)
+ list_free(hint->words);
pfree(hint);
}
-static PlanHint *
-PlanHintCreate(void)
-{
- PlanHint *hint;
-
- hint = palloc(sizeof(PlanHint));
- hint->hint_str = NULL;
- hint->nall_hints = 0;
- hint->max_all_hints = 0;
- hint->all_hints = NULL;
- memset(hint->num_hints, 0, sizeof(hint->num_hints));
- hint->scan_hints = NULL;
- hint->init_scan_mask = 0;
- hint->parent_relid = 0;
- hint->parent_hint = NULL;
- hint->join_hints = NULL;
- hint->init_join_mask = 0;
- hint->join_hint_level = NULL;
- hint->leading_hint = NULL;
- hint->context = superuser() ? PGC_SUSET : PGC_USERSET;
- hint->set_hints = NULL;
-
- return hint;
+static HintState *
+HintStateCreate(void)
+{
+ HintState *hstate;
+
+ hstate = palloc(sizeof(HintState));
+ hstate->hint_str = NULL;
+ hstate->nall_hints = 0;
+ hstate->max_all_hints = 0;
+ hstate->all_hints = NULL;
+ memset(hstate->num_hints, 0, sizeof(hstate->num_hints));
+ hstate->scan_hints = NULL;
+ hstate->init_scan_mask = 0;
+ hstate->parent_relid = 0;
+ hstate->parent_rel_oid = InvalidOid;
+ hstate->parent_hint = NULL;
+ hstate->parent_index_infos = NIL;
+ hstate->join_hints = NULL;
+ hstate->init_join_mask = 0;
+ hstate->join_hint_level = NULL;
+ hstate->leading_hint = NULL;
+ hstate->context = superuser() ? PGC_SUSET : PGC_USERSET;
+ hstate->set_hints = NULL;
+
+ return hstate;
}
static void
-PlanHintDelete(PlanHint *hint)
+HintStateDelete(HintState *hstate)
{
int i;
- if (!hint)
+ if (!hstate)
return;
- if (hint->hint_str)
- pfree(hint->hint_str);
+ if (hstate->hint_str)
+ pfree(hstate->hint_str);
- for (i = 0; i < hint->num_hints[HINT_TYPE_SCAN_METHOD]; i++)
- hint->all_hints[i]->delete_func(hint->all_hints[i]);
- if (hint->all_hints)
- pfree(hint->all_hints);
+ for (i = 0; i < hstate->num_hints[HINT_TYPE_SCAN_METHOD]; i++)
+ hstate->all_hints[i]->delete_func(hstate->all_hints[i]);
+ if (hstate->all_hints)
+ pfree(hstate->all_hints);
+ if (hstate->parent_index_infos)
+ list_free(hstate->parent_index_infos);
}
/*
- * dump functions
+ * Copy given value into buf, with quoting with '"' if necessary.
*/
-
static void
-dump_quote_value(StringInfo buf, const char *value)
+quote_value(StringInfo buf, const char *value)
{
bool need_quote = false;
const char *str;
for (str = value; *str != '\0'; str++)
{
- if (isspace(*str) || *str == ')' || *str == '"')
+ if (isspace(*str) || *str == '(' || *str == ')' || *str == '"')
{
need_quote = true;
appendStringInfoCharMacro(buf, '"');
}
static void
-ScanMethodHintDump(ScanMethodHint *hint, StringInfo buf)
+ScanMethodHintDesc(ScanMethodHint *hint, StringInfo buf)
{
ListCell *l;
appendStringInfo(buf, "%s(", hint->base.keyword);
- dump_quote_value(buf, hint->relname);
- foreach(l, hint->indexnames)
+ if (hint->relname != NULL)
{
- appendStringInfoCharMacro(buf, ' ');
- dump_quote_value(buf, (char *) lfirst(l));
+ quote_value(buf, hint->relname);
+ foreach(l, hint->indexnames)
+ {
+ appendStringInfoCharMacro(buf, ' ');
+ quote_value(buf, (char *) lfirst(l));
+ }
}
appendStringInfoString(buf, ")\n");
}
static void
-JoinMethodHintDump(JoinMethodHint *hint, StringInfo buf)
+JoinMethodHintDesc(JoinMethodHint *hint, StringInfo buf)
{
int i;
appendStringInfo(buf, "%s(", hint->base.keyword);
- dump_quote_value(buf, hint->relnames[0]);
- for (i = 1; i < hint->nrels; i++)
+ if (hint->relnames != NULL)
{
- appendStringInfoCharMacro(buf, ' ');
- dump_quote_value(buf, hint->relnames[i]);
+ quote_value(buf, hint->relnames[0]);
+ for (i = 1; i < hint->nrels; i++)
+ {
+ appendStringInfoCharMacro(buf, ' ');
+ quote_value(buf, hint->relnames[i]);
+ }
}
appendStringInfoString(buf, ")\n");
}
static void
-LeadingHintDump(LeadingHint *hint, StringInfo buf)
+OuterInnerDesc(OuterInnerRels *outer_inner, StringInfo buf)
{
- bool is_first;
- ListCell *l;
+ if (outer_inner->relation == NULL)
+ {
+ bool is_first;
+ ListCell *l;
+
+ is_first = true;
+
+ appendStringInfoCharMacro(buf, '(');
+ foreach(l, outer_inner->outer_inner_pair)
+ {
+ if (is_first)
+ is_first = false;
+ else
+ appendStringInfoCharMacro(buf, ' ');
+
+ OuterInnerDesc(lfirst(l), buf);
+ }
+
+ appendStringInfoCharMacro(buf, ')');
+ }
+ else
+ quote_value(buf, outer_inner->relation);
+}
+static void
+LeadingHintDesc(LeadingHint *hint, StringInfo buf)
+{
appendStringInfo(buf, "%s(", HINT_LEADING);
- is_first = true;
- foreach(l, hint->relations)
+ if (hint->outer_inner == NULL)
{
- if (is_first)
- is_first = false;
- else
- appendStringInfoCharMacro(buf, ' ');
+ ListCell *l;
+ bool is_first;
+
+ is_first = true;
+
+ foreach(l, hint->relations)
+ {
+ if (is_first)
+ is_first = false;
+ else
+ appendStringInfoCharMacro(buf, ' ');
- dump_quote_value(buf, (char *) lfirst(l));
+ quote_value(buf, (char *) lfirst(l));
+ }
}
+ else
+ OuterInnerDesc(hint->outer_inner, buf);
appendStringInfoString(buf, ")\n");
}
static void
-SetHintDump(SetHint *hint, StringInfo buf)
+SetHintDesc(SetHint *hint, StringInfo buf)
{
+ bool is_first = true;
+ ListCell *l;
+
appendStringInfo(buf, "%s(", HINT_SET);
- dump_quote_value(buf, hint->name);
- appendStringInfoCharMacro(buf, ' ');
- dump_quote_value(buf, hint->value);
+ foreach(l, hint->words)
+ {
+ if (is_first)
+ is_first = false;
+ else
+ appendStringInfoCharMacro(buf, ' ');
+
+ quote_value(buf, (char *) lfirst(l));
+ }
appendStringInfo(buf, ")\n");
}
+/*
+ * Append string which represents all hints in a given state to buf, with
+ * preceding title with them.
+ */
static void
-all_hint_dump(PlanHint *hint, StringInfo buf, const char *title,
- HintStatus state)
+desc_hint_in_state(HintState *hstate, StringInfo buf, const char *title,
+ HintStatus state)
{
int i;
appendStringInfo(buf, "%s:\n", title);
- for (i = 0; i < hint->nall_hints; i++)
+ for (i = 0; i < hstate->nall_hints; i++)
{
- if (hint->all_hints[i]->state != state)
+ if (hstate->all_hints[i]->state != state)
continue;
- hint->all_hints[i]->dump_func(hint->all_hints[i], buf);
+ hstate->all_hints[i]->desc_func(hstate->all_hints[i], buf);
}
}
+/*
+ * Dump contents of given hstate to server log with log level LOG.
+ */
static void
-PlanHintDump(PlanHint *hint)
+HintStateDump(HintState *hstate)
{
StringInfoData buf;
- if (!hint)
+ if (!hstate)
{
elog(LOG, "pg_hint_plan:\nno hint");
return;
initStringInfo(&buf);
appendStringInfoString(&buf, "pg_hint_plan:\n");
- all_hint_dump(hint, &buf, "used hint", HINT_STATE_USED);
- all_hint_dump(hint, &buf, "not used hint", HINT_STATE_NOTUSED);
- all_hint_dump(hint, &buf, "duplication hint", HINT_STATE_DUPLICATION);
- all_hint_dump(hint, &buf, "error hint", HINT_STATE_ERROR);
+ desc_hint_in_state(hstate, &buf, "used hint", HINT_STATE_USED);
+ desc_hint_in_state(hstate, &buf, "not used hint", HINT_STATE_NOTUSED);
+ desc_hint_in_state(hstate, &buf, "duplication hint", HINT_STATE_DUPLICATION);
+ desc_hint_in_state(hstate, &buf, "error hint", HINT_STATE_ERROR);
elog(LOG, "%s", buf.data);
}
static int
-AllHintCmp(const void *a, const void *b, bool order)
+HintCmp(const void *a, const void *b)
{
const Hint *hinta = *((const Hint **) a);
const Hint *hintb = *((const Hint **) b);
- int result = 0;
if (hinta->type != hintb->type)
return hinta->type - hintb->type;
-
- if ((result = hinta->cmp_func(hinta, hintb)) != 0 || !order)
- return result;
-
- /* ヒント句で指定した順を返す */
- return hinta->hint_str - hintb->hint_str;
+ if (hinta->state == HINT_STATE_ERROR)
+ return -1;
+ if (hintb->state == HINT_STATE_ERROR)
+ return 1;
+ return hinta->cmp_func(hinta, hintb);
}
+/*
+ * Returns byte offset of hint b from hint a. If hint a was specified before
+ * b, positive value is returned.
+ */
static int
-AllHintCmpIsOrder(const void *a, const void *b)
+HintCmpWithPos(const void *a, const void *b)
{
- return AllHintCmp(a, b, true);
+ const Hint *hinta = *((const Hint **) a);
+ const Hint *hintb = *((const Hint **) b);
+ int result;
+
+ result = HintCmp(a, b);
+ if (result == 0)
+ result = hinta->hint_str - hintb->hint_str;
+
+ return result;
}
/*
* parse functions
*/
-
static const char *
parse_keyword(const char *str, StringInfo buf)
{
}
static const char *
-skip_opened_parenthesis(const char *str)
+skip_parenthesis(const char *str, char parenthesis)
{
skip_space(str);
- if (*str != '(')
+ if (*str != parenthesis)
{
- parse_ereport(str, ("Opening parenthesis is necessary."));
- return NULL;
- }
-
- str++;
+ if (parenthesis == '(')
+ hint_ereport(str, ("Opening parenthesis is necessary."));
+ else if (parenthesis == ')')
+ hint_ereport(str, ("Closing parenthesis is necessary."));
- return str;
-}
-
-static const char *
-skip_closed_parenthesis(const char *str)
-{
- skip_space(str);
-
- if (*str != ')')
- {
- parse_ereport(str, ("Closing parenthesis is necessary."));
return NULL;
}
}
/*
- * 二重引用符で囲まれているかもしれないトークンを読み取り word 引数に palloc
- * で確保したバッファに格納してそのポインタを返す。
+ * Parse a token from str, and store malloc'd copy into word. A token can be
+ * quoted with '"'. Return value is pointer to unparsed portion of original
+ * string, or NULL if an error occurred.
*
- * 正常にパースできた場合は残りの文字列の先頭位置を、異常があった場合は NULL を
- * 返す。
- * truncateがtrueの場合は、NAMEDATALENに切り詰める。
+ * Parsed token is truncated within NAMEDATALEN-1 bytes, when truncate is true.
*/
static const char *
-parse_quote_value(const char *str, char **word, char *value_type, bool truncate)
+parse_quoted_value(const char *str, char **word, bool truncate)
{
StringInfoData buf;
bool in_quote;
- /* 先頭のスペースは読み飛ばす。 */
+ /* Skip leading spaces. */
skip_space(str);
initStringInfo(&buf);
{
if (in_quote)
{
- /* 二重引用符が閉じられていない場合はパース中断 */
+ /* Double quotation must be closed. */
if (*str == '\0')
{
pfree(buf.data);
- parse_ereport(str, ("Unterminated quoted %s.", value_type));
+ hint_ereport(str, ("Unterminated quoted string."));
return NULL;
}
/*
- * エスケープ対象のダブルクウォートをスキップする。
- * もしブロックコメントの開始文字列や終了文字列もオブジェクト名とし
- * て使用したい場合は、/ と * もエスケープ対象とすることで使用できる
- * が、処理対象としていない。もしテーブル名にこれらの文字が含まれる
- * 場合は、エイリアスを指定する必要がある。
+ * Skip escaped double quotation.
+ *
+ * We don't allow slash-asterisk and asterisk-slash (delimiters of
+ * block comments) to be an object name, so users must specify
+ * alias for such object names.
+ *
+ * Those special names can be allowed if we care escaped slashes
+ * and asterisks, but we don't.
*/
if (*str == '"')
{
break;
}
}
- else if (isspace(*str) || *str == ')' || *str == '"' || *str == '\0')
+ else if (isspace(*str) || *str == '(' || *str == ')' || *str == '"' ||
+ *str == '\0')
break;
appendStringInfoCharMacro(&buf, *str++);
if (buf.len == 0)
{
- char *type;
-
- type = pstrdup(value_type);
- type[0] = toupper(type[0]);
- parse_ereport(str, ("%s is necessary.", type));
+ hint_ereport(str, ("Zero-length delimited string."));
pfree(buf.data);
- pfree(type);
return NULL;
}
- /* Truncate name if it's overlength */
+ /* Truncate name if it's too long */
if (truncate)
truncate_identifier(buf.data, strlen(buf.data), true);
return str;
}
+static OuterInnerRels *
+OuterInnerRelsCreate(char *name, List *outer_inner_list)
+{
+ OuterInnerRels *outer_inner;
+
+ outer_inner = palloc(sizeof(OuterInnerRels));
+ outer_inner->relation = name;
+ outer_inner->outer_inner_pair = outer_inner_list;
+
+ return outer_inner;
+}
+
+static const char *
+parse_parentheses_Leading_in(const char *str, OuterInnerRels **outer_inner)
+{
+ List *outer_inner_pair = NIL;
+
+ if ((str = skip_parenthesis(str, '(')) == NULL)
+ return NULL;
+
+ skip_space(str);
+
+ /* Store words in parentheses into outer_inner_list. */
+ while(*str != ')' && *str != '\0')
+ {
+ OuterInnerRels *outer_inner_rels;
+
+ if (*str == '(')
+ {
+ str = parse_parentheses_Leading_in(str, &outer_inner_rels);
+ if (str == NULL)
+ break;
+ }
+ else
+ {
+ char *name;
+
+ if ((str = parse_quoted_value(str, &name, true)) == NULL)
+ break;
+ else
+ outer_inner_rels = OuterInnerRelsCreate(name, NIL);
+ }
+
+ outer_inner_pair = lappend(outer_inner_pair, outer_inner_rels);
+ skip_space(str);
+ }
+
+ if (str == NULL ||
+ (str = skip_parenthesis(str, ')')) == NULL)
+ {
+ list_free(outer_inner_pair);
+ return NULL;
+ }
+
+ *outer_inner = OuterInnerRelsCreate(NULL, outer_inner_pair);
+
+ return str;
+}
+
+static const char *
+parse_parentheses_Leading(const char *str, List **name_list,
+ OuterInnerRels **outer_inner)
+{
+ char *name;
+ bool truncate = true;
+
+ if ((str = skip_parenthesis(str, '(')) == NULL)
+ return NULL;
+
+ skip_space(str);
+ if (*str =='(')
+ {
+ if ((str = parse_parentheses_Leading_in(str, outer_inner)) == NULL)
+ return NULL;
+ }
+ else
+ {
+ /* Store words in parentheses into name_list. */
+ while(*str != ')' && *str != '\0')
+ {
+ if ((str = parse_quoted_value(str, &name, truncate)) == NULL)
+ {
+ list_free(*name_list);
+ return NULL;
+ }
+
+ *name_list = lappend(*name_list, name);
+ skip_space(str);
+ }
+ }
+
+ if ((str = skip_parenthesis(str, ')')) == NULL)
+ return NULL;
+ return str;
+}
+
+static const char *
+parse_parentheses(const char *str, List **name_list, HintKeyword keyword)
+{
+ char *name;
+ bool truncate = true;
+
+ if ((str = skip_parenthesis(str, '(')) == NULL)
+ return NULL;
+
+ skip_space(str);
+
+ /* Store words in parentheses into name_list. */
+ while(*str != ')' && *str != '\0')
+ {
+ if ((str = parse_quoted_value(str, &name, truncate)) == NULL)
+ {
+ list_free(*name_list);
+ return NULL;
+ }
+
+ *name_list = lappend(*name_list, name);
+ skip_space(str);
+
+ if (keyword == HINT_KEYWORD_INDEXSCANREGEXP ||
+#if PG_VERSION_NUM >= 90200
+ keyword == HINT_KEYWORD_INDEXONLYSCANREGEXP ||
+#endif
+ keyword == HINT_KEYWORD_BITMAPSCANREGEXP ||
+ keyword == HINT_KEYWORD_SET)
+ {
+ truncate = false;
+ }
+ }
+
+ if ((str = skip_parenthesis(str, ')')) == NULL)
+ return NULL;
+ return str;
+}
+
static void
-parse_hints(PlanHint *plan, Query *parse, const char *str)
+parse_hints(HintState *hstate, Query *parse, const char *str)
{
StringInfoData buf;
char *head;
if (strcasecmp(buf.data, keyword) != 0)
continue;
- hint = parser->create_func(head, keyword);
+ hint = parser->create_func(head, keyword, parser->hint_keyword);
/* parser of each hint does parse in a parenthesis. */
- if ((str = skip_opened_parenthesis(str)) == NULL ||
- (str = hint->parser_func(hint, plan, parse, str)) == NULL ||
- (str = skip_closed_parenthesis(str)) == NULL)
+ if ((str = hint->parse_func(hint, hstate, parse, str)) == NULL)
{
hint->delete_func(hint);
pfree(buf.data);
}
/*
- * 出来上がったヒント情報を追加。スロットが足りない場合は二倍に拡張
- * する。
+ * Add hint information into all_hints array. If we don't have
+ * enough space, double the array.
*/
- if (plan->nall_hints == 0)
+ if (hstate->nall_hints == 0)
{
- plan->max_all_hints = HINT_ARRAY_DEFAULT_INITSIZE;
- plan->all_hints = palloc(sizeof(Hint *) * plan->max_all_hints);
+ hstate->max_all_hints = HINT_ARRAY_DEFAULT_INITSIZE;
+ hstate->all_hints = (Hint **)
+ palloc(sizeof(Hint *) * hstate->max_all_hints);
}
- else if (plan->nall_hints == plan->max_all_hints)
+ else if (hstate->nall_hints == hstate->max_all_hints)
{
- plan->max_all_hints *= 2;
- plan->all_hints = repalloc(plan->all_hints,
- sizeof(Hint *) * plan->max_all_hints);
+ hstate->max_all_hints *= 2;
+ hstate->all_hints = (Hint **)
+ repalloc(hstate->all_hints,
+ sizeof(Hint *) * hstate->max_all_hints);
}
- plan->all_hints[plan->nall_hints] = hint;
- plan->nall_hints++;
+ hstate->all_hints[hstate->nall_hints] = hint;
+ hstate->nall_hints++;
skip_space(str);
if (parser->keyword == NULL)
{
- parse_ereport(head, ("Unrecognized hint keyword \"%s\".",
- buf.data));
+ hint_ereport(head,
+ ("Unrecognized hint keyword \"%s\".", buf.data));
pfree(buf.data);
return;
}
pfree(buf.data);
}
+
+/*
+ * Get hints from table by client-supplied query string and application name.
+ */
+static const char *
+get_hints_from_table(const char *client_query, const char *client_application)
+{
+ const char *search_query =
+ "SELECT hints "
+ " FROM hint_plan.hints "
+ " WHERE norm_query_string = $1 "
+ " AND ( application_name = $2 "
+ " OR application_name = '' ) "
+ " ORDER BY application_name DESC";
+ static SPIPlanPtr plan = NULL;
+ char *hints = NULL;
+ Oid argtypes[2] = { TEXTOID, TEXTOID };
+ Datum values[2];
+ bool nulls[2] = { false, false };
+ text *qry;
+ text *app;
+
+ PG_TRY();
+ {
+ ++nested_level;
+
+ SPI_connect();
+
+ if (plan == NULL)
+ {
+ SPIPlanPtr p;
+ p = SPI_prepare(search_query, 2, argtypes);
+ plan = SPI_saveplan(p);
+ SPI_freeplan(p);
+ }
+
+ qry = cstring_to_text(client_query);
+ app = cstring_to_text(client_application);
+ values[0] = PointerGetDatum(qry);
+ values[1] = PointerGetDatum(app);
+
+ SPI_execute_plan(plan, values, nulls, true, 1);
+
+ if (SPI_processed > 0)
+ {
+ char *buf;
+
+ hints = SPI_getvalue(SPI_tuptable->vals[0],
+ SPI_tuptable->tupdesc, 1);
+ /*
+ * Here we use SPI_palloc to ensure that hints string is valid even
+ * after SPI_finish call. We can't use simple palloc because it
+ * allocates memory in SPI's context and that context is deleted in
+ * SPI_finish.
+ */
+ buf = SPI_palloc(strlen(hints) + 1);
+ strcpy(buf, hints);
+ hints = buf;
+ }
+
+ SPI_finish();
+
+ --nested_level;
+ }
+ PG_CATCH();
+ {
+ --nested_level;
+ PG_RE_THROW();
+ }
+ PG_END_TRY();
+
+ return hints;
+}
+
/*
- * Do basic parsing of the query head comment.
+ * Get client-supplied query string.
*/
-static PlanHint *
-parse_head_comment(Query *parse)
+static const char *
+get_query_string(void)
{
const char *p;
- char *head;
- char *tail;
- int len;
- int i;
- PlanHint *plan;
- /* get client-supplied query string. */
if (stmt_name)
{
PreparedStatement *entry;
entry = FetchPreparedStatement(stmt_name, true);
p = entry->plansource->query_string;
}
+ else if (plpgsql_query_string)
+ p = plpgsql_query_string;
else
p = debug_query_string;
+ return p;
+}
+
+/*
+ * Get hints from the head block comment in client-supplied query string.
+ */
+static const char *
+get_hints_from_comment(const char *p)
+{
+ const char *hint_head;
+ char *head;
+ char *tail;
+ int len;
+
if (p == NULL)
return NULL;
/* extract query head comment. */
- len = strlen(HINT_START);
- skip_space(p);
- if (strncmp(p, HINT_START, len))
+ hint_head = strstr(p, HINT_START);
+ if (hint_head == NULL)
return NULL;
+ for (;p < hint_head; p++)
+ {
+ /*
+ * Allow these characters precedes hint comment:
+ * - digits
+ * - alphabets which are in ASCII range
+ * - space, tabs and new-lines
+ * - underscores, for identifier
+ * - commas, for SELECT clause, EXPLAIN and PREPARE
+ * - parentheses, for EXPLAIN and PREPARE
+ *
+ * Note that we don't use isalpha() nor isalnum() in ctype.h here to
+ * avoid behavior which depends on locale setting.
+ */
+ if (!(*p >= '0' && *p <= '9') &&
+ !(*p >= 'A' && *p <= 'Z') &&
+ !(*p >= 'a' && *p <= 'z') &&
+ !isspace(*p) &&
+ *p != '_' &&
+ *p != ',' &&
+ *p != '(' && *p != ')')
+ return NULL;
+ }
+ len = strlen(HINT_START);
head = (char *) p;
p += len;
skip_space(p);
/* find hint end keyword. */
if ((tail = strstr(p, HINT_END)) == NULL)
{
- parse_ereport(head, ("Unterminated block comment."));
+ hint_ereport(head, ("Unterminated block comment."));
return NULL;
}
- /* 入れ子にしたブロックコメントはサポートしない */
+ /* We don't support nested block comments. */
if ((head = strstr(p, BLOCK_COMMENT_START)) != NULL && head < tail)
{
- parse_ereport(head, ("Nested block comments are not supported."));
+ hint_ereport(head, ("Nested block comments are not supported."));
return NULL;
}
- /* ヒント句部分を切り出す */
+ /* Make a copy of hint. */
len = tail - p;
head = palloc(len + 1);
memcpy(head, p, len);
head[len] = '\0';
p = head;
- plan = PlanHintCreate();
- plan->hint_str = head;
+ return p;
+}
- /* parse each hint. */
- parse_hints(plan, parse, p);
+/*
+ * Parse hints that got, create hint struct from parse tree and parse hints.
+ */
+static HintState *
+create_hintstate(Query *parse, const char *hints)
+{
+ const char *p;
+ int i;
+ HintState *hstate;
- /* When nothing specified a hint, we free PlanHint and returns NULL. */
- if (plan->nall_hints == 0)
- {
- PlanHintDelete(plan);
+ if (hints == NULL)
+ return NULL;
+
+ p = hints;
+ hstate = HintStateCreate();
+ hstate->hint_str = (char *) hints;
+
+ /* parse each hint. */
+ parse_hints(hstate, parse, p);
+
+ /* When nothing specified a hint, we free HintState and returns NULL. */
+ if (hstate->nall_hints == 0)
+ {
+ HintStateDelete(hstate);
return NULL;
}
- /* パースしたヒントを並び替える */
- qsort(plan->all_hints, plan->nall_hints, sizeof(Hint *), AllHintCmpIsOrder);
+ /* Sort hints in order of original position. */
+ qsort(hstate->all_hints, hstate->nall_hints, sizeof(Hint *),
+ HintCmpWithPos);
- /* 重複したヒントを検索する */
- for (i = 0; i < plan->nall_hints; i++)
+ /* Count number of hints per hint-type. */
+ for (i = 0; i < hstate->nall_hints; i++)
{
- Hint *hint = plan->all_hints[i];
+ Hint *cur_hint = hstate->all_hints[i];
+ hstate->num_hints[cur_hint->type]++;
+ }
- plan->num_hints[hint->type]++;
+ /*
+ * If an object (or a set of objects) has multiple hints of same hint-type,
+ * only the last hint is valid and others are ignored in planning.
+ * Hints except the last are marked as 'duplicated' to remember the order.
+ */
+ for (i = 0; i < hstate->nall_hints - 1; i++)
+ {
+ Hint *cur_hint = hstate->all_hints[i];
+ Hint *next_hint = hstate->all_hints[i + 1];
- if (i + 1 >= plan->nall_hints)
- break;
+ /*
+ * Leading hint is marked as 'duplicated' in transform_join_hints.
+ */
+ if (cur_hint->type == HINT_TYPE_LEADING &&
+ next_hint->type == HINT_TYPE_LEADING)
+ continue;
- if (AllHintCmp(plan->all_hints + i, plan->all_hints + i + 1, false)
- == 0)
+ /*
+ * Note that we need to pass addresses of hint pointers, because
+ * HintCmp is designed to sort array of Hint* by qsort.
+ */
+ if (HintCmp(&cur_hint, &next_hint) == 0)
{
- const char *HintTypeName[] = {"scan method", "join method",
- "leading", "set"};
-
- parse_ereport(plan->all_hints[i]->hint_str,
- ("Conflict %s hint.", HintTypeName[hint->type]));
- plan->all_hints[i]->state = HINT_STATE_DUPLICATION;
+ hint_ereport(cur_hint->hint_str,
+ ("Conflict %s hint.", HintTypeName[cur_hint->type]));
+ cur_hint->state = HINT_STATE_DUPLICATION;
}
}
- plan->scan_hints = (ScanMethodHint **) plan->all_hints;
- plan->join_hints = (JoinMethodHint **) plan->all_hints +
- plan->num_hints[HINT_TYPE_SCAN_METHOD];
- plan->leading_hint = (LeadingHint *) plan->all_hints[
- plan->num_hints[HINT_TYPE_SCAN_METHOD] +
- plan->num_hints[HINT_TYPE_JOIN_METHOD] +
- plan->num_hints[HINT_TYPE_LEADING] - 1];
- plan->set_hints = (SetHint **) plan->all_hints +
- plan->num_hints[HINT_TYPE_SCAN_METHOD] +
- plan->num_hints[HINT_TYPE_JOIN_METHOD] +
- plan->num_hints[HINT_TYPE_LEADING];
-
- return plan;
+ /*
+ * Make sure that per-type array pointers point proper position in the
+ * array which consists of all hints.
+ */
+ hstate->scan_hints = (ScanMethodHint **) hstate->all_hints;
+ hstate->join_hints = (JoinMethodHint **) (hstate->scan_hints +
+ hstate->num_hints[HINT_TYPE_SCAN_METHOD]);
+ hstate->leading_hint = (LeadingHint **) (hstate->join_hints +
+ hstate->num_hints[HINT_TYPE_JOIN_METHOD]);
+ hstate->set_hints = (SetHint **) (hstate->leading_hint +
+ hstate->num_hints[HINT_TYPE_LEADING]);
+
+ return hstate;
}
/*
- * スキャン方式ヒントのカッコ内をパースする
+ * Parse inside of parentheses of scan-method hints.
*/
static const char *
-ScanMethodHintParse(ScanMethodHint *hint, PlanHint *plan, Query *parse,
+ScanMethodHintParse(ScanMethodHint *hint, HintState *hstate, Query *parse,
const char *str)
{
- const char *keyword = hint->base.keyword;
+ const char *keyword = hint->base.keyword;
+ HintKeyword hint_keyword = hint->base.hint_keyword;
+ List *name_list = NIL;
+ int length;
- /*
- * スキャン方式のヒントでリレーション名が読み取れない場合はヒント無効
- */
- if ((str = parse_quote_value(str, &hint->relname, "relation name", true))
- == NULL)
+ if ((str = parse_parentheses(str, &name_list, hint_keyword)) == NULL)
return NULL;
- skip_space(str);
-
- /*
- * インデックスリストを受け付けるヒントであれば、インデックス参照をパース
- * する。
- */
- if (strcmp(keyword, HINT_INDEXSCAN) == 0 ||
- strcmp(keyword, HINT_BITMAPSCAN) == 0)
+ /* Parse relation name and index name(s) if given hint accepts. */
+ length = list_length(name_list);
+ if (length > 0)
{
- while (*str != ')' && *str != '\0')
+ hint->relname = linitial(name_list);
+ hint->indexnames = list_delete_first(name_list);
+
+ /* check whether the hint accepts index name(s). */
+ if (length != 1 &&
+ hint_keyword != HINT_KEYWORD_INDEXSCAN &&
+ hint_keyword != HINT_KEYWORD_INDEXSCANREGEXP &&
+#if PG_VERSION_NUM >= 90200
+ hint_keyword != HINT_KEYWORD_INDEXONLYSCAN &&
+ hint_keyword != HINT_KEYWORD_INDEXONLYSCANREGEXP &&
+#endif
+ hint_keyword != HINT_KEYWORD_BITMAPSCAN &&
+ hint_keyword != HINT_KEYWORD_BITMAPSCANREGEXP)
{
- char *indexname;
-
- str = parse_quote_value(str, &indexname, "index name", true);
- if (str == NULL)
- return NULL;
-
- hint->indexnames = lappend(hint->indexnames, indexname);
- skip_space(str);
+ hint_ereport(str,
+ ("%s hint accepts only one relation.",
+ hint->base.keyword));
+ hint->base.state = HINT_STATE_ERROR;
+ return str;
}
}
-
- /*
- * ヒントごとに決まっている許容スキャン方式をビットマスクとして設定
- */
- if (strcasecmp(keyword, HINT_SEQSCAN) == 0)
- hint->enforce_mask = ENABLE_SEQSCAN;
- else if (strcasecmp(keyword, HINT_INDEXSCAN) == 0)
- hint->enforce_mask = ENABLE_INDEXSCAN;
- else if (strcasecmp(keyword, HINT_BITMAPSCAN) == 0)
- hint->enforce_mask = ENABLE_BITMAPSCAN;
- else if (strcasecmp(keyword, HINT_TIDSCAN) == 0)
- hint->enforce_mask = ENABLE_TIDSCAN;
- else if (strcasecmp(keyword, HINT_NOSEQSCAN) == 0)
- hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_SEQSCAN;
- else if (strcasecmp(keyword, HINT_NOINDEXSCAN) == 0)
- hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_INDEXSCAN;
- else if (strcasecmp(keyword, HINT_NOBITMAPSCAN) == 0)
- hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_BITMAPSCAN;
- else if (strcasecmp(keyword, HINT_NOTIDSCAN) == 0)
- hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_TIDSCAN;
else
{
- parse_ereport(str, ("Unrecognized hint keyword \"%s\".", keyword));
- return NULL;
+ hint_ereport(str,
+ ("%s hint requires a relation.",
+ hint->base.keyword));
+ hint->base.state = HINT_STATE_ERROR;
+ return str;
+ }
+
+ /* Set a bit for specified hint. */
+ switch (hint_keyword)
+ {
+ case HINT_KEYWORD_SEQSCAN:
+ hint->enforce_mask = ENABLE_SEQSCAN;
+ break;
+ case HINT_KEYWORD_INDEXSCAN:
+ hint->enforce_mask = ENABLE_INDEXSCAN;
+ break;
+ case HINT_KEYWORD_INDEXSCANREGEXP:
+ hint->enforce_mask = ENABLE_INDEXSCAN;
+ hint->regexp = true;
+ break;
+ case HINT_KEYWORD_BITMAPSCAN:
+ hint->enforce_mask = ENABLE_BITMAPSCAN;
+ break;
+ case HINT_KEYWORD_BITMAPSCANREGEXP:
+ hint->enforce_mask = ENABLE_BITMAPSCAN;
+ hint->regexp = true;
+ break;
+ case HINT_KEYWORD_TIDSCAN:
+ hint->enforce_mask = ENABLE_TIDSCAN;
+ break;
+ case HINT_KEYWORD_NOSEQSCAN:
+ hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_SEQSCAN;
+ break;
+ case HINT_KEYWORD_NOINDEXSCAN:
+ hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_INDEXSCAN;
+ break;
+ case HINT_KEYWORD_NOBITMAPSCAN:
+ hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_BITMAPSCAN;
+ break;
+ case HINT_KEYWORD_NOTIDSCAN:
+ hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_TIDSCAN;
+ break;
+#if PG_VERSION_NUM >= 90200
+ case HINT_KEYWORD_INDEXONLYSCAN:
+ hint->enforce_mask = ENABLE_INDEXSCAN | ENABLE_INDEXONLYSCAN;
+ break;
+ case HINT_KEYWORD_INDEXONLYSCANREGEXP:
+ hint->enforce_mask = ENABLE_INDEXSCAN | ENABLE_INDEXONLYSCAN;
+ hint->regexp = true;
+ break;
+ case HINT_KEYWORD_NOINDEXONLYSCAN:
+ hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_INDEXONLYSCAN;
+ break;
+#endif
+ default:
+ hint_ereport(str, ("Unrecognized hint keyword \"%s\".", keyword));
+ return NULL;
+ break;
}
return str;
}
static const char *
-JoinMethodHintParse(JoinMethodHint *hint, PlanHint *plan, Query *parse,
+JoinMethodHintParse(JoinMethodHint *hint, HintState *hstate, Query *parse,
const char *str)
{
- char *relname;
- const char *keyword = hint->base.keyword;
+ const char *keyword = hint->base.keyword;
+ HintKeyword hint_keyword = hint->base.hint_keyword;
+ List *name_list = NIL;
- skip_space(str);
+ if ((str = parse_parentheses(str, &name_list, hint_keyword)) == NULL)
+ return NULL;
- hint->relnames = palloc(sizeof(char *));
+ hint->nrels = list_length(name_list);
- while ((str = parse_quote_value(str, &relname, "relation name", true))
- != NULL)
+ if (hint->nrels > 0)
{
- hint->nrels++;
- hint->relnames = repalloc(hint->relnames, sizeof(char *) * hint->nrels);
- hint->relnames[hint->nrels - 1] = relname;
+ ListCell *l;
+ int i = 0;
- skip_space(str);
- if (*str == ')')
- break;
+ /*
+ * Transform relation names from list to array to sort them with qsort
+ * after.
+ */
+ hint->relnames = palloc(sizeof(char *) * hint->nrels);
+ foreach (l, name_list)
+ {
+ hint->relnames[i] = lfirst(l);
+ i++;
+ }
}
- if (str == NULL)
- return NULL;
+ list_free(name_list);
- /* Join 対象のテーブルは最低でも2つ指定する必要がある */
+ /* A join hint requires at least two relations */
if (hint->nrels < 2)
{
- parse_ereport(str,
- ("%s hint requires at least two relations.",
- hint->base.keyword));
+ hint_ereport(str,
+ ("%s hint requires at least two relations.",
+ hint->base.keyword));
hint->base.state = HINT_STATE_ERROR;
+ return str;
}
- /* テーブル名順にソートする */
+ /* Sort hints in alphabetical order of relation names. */
qsort(hint->relnames, hint->nrels, sizeof(char *), RelnameCmp);
- if (strcasecmp(keyword, HINT_NESTLOOP) == 0)
- hint->enforce_mask = ENABLE_NESTLOOP;
- else if (strcasecmp(keyword, HINT_MERGEJOIN) == 0)
- hint->enforce_mask = ENABLE_MERGEJOIN;
- else if (strcasecmp(keyword, HINT_HASHJOIN) == 0)
- hint->enforce_mask = ENABLE_HASHJOIN;
- else if (strcasecmp(keyword, HINT_NONESTLOOP) == 0)
- hint->enforce_mask = ENABLE_ALL_JOIN ^ ENABLE_NESTLOOP;
- else if (strcasecmp(keyword, HINT_NOMERGEJOIN) == 0)
- hint->enforce_mask = ENABLE_ALL_JOIN ^ ENABLE_MERGEJOIN;
- else if (strcasecmp(keyword, HINT_NOHASHJOIN) == 0)
- hint->enforce_mask = ENABLE_ALL_JOIN ^ ENABLE_HASHJOIN;
- else
+ switch (hint_keyword)
{
- parse_ereport(str, ("Unrecognized hint keyword \"%s\".", keyword));
- return NULL;
+ case HINT_KEYWORD_NESTLOOP:
+ hint->enforce_mask = ENABLE_NESTLOOP;
+ break;
+ case HINT_KEYWORD_MERGEJOIN:
+ hint->enforce_mask = ENABLE_MERGEJOIN;
+ break;
+ case HINT_KEYWORD_HASHJOIN:
+ hint->enforce_mask = ENABLE_HASHJOIN;
+ break;
+ case HINT_KEYWORD_NONESTLOOP:
+ hint->enforce_mask = ENABLE_ALL_JOIN ^ ENABLE_NESTLOOP;
+ break;
+ case HINT_KEYWORD_NOMERGEJOIN:
+ hint->enforce_mask = ENABLE_ALL_JOIN ^ ENABLE_MERGEJOIN;
+ break;
+ case HINT_KEYWORD_NOHASHJOIN:
+ hint->enforce_mask = ENABLE_ALL_JOIN ^ ENABLE_HASHJOIN;
+ break;
+ default:
+ hint_ereport(str, ("Unrecognized hint keyword \"%s\".", keyword));
+ return NULL;
+ break;
}
return str;
}
-static const char *
-LeadingHintParse(LeadingHint *hint, PlanHint *plan, Query *parse,
- const char *str)
+static bool
+OuterInnerPairCheck(OuterInnerRels *outer_inner)
{
- skip_space(str);
+ ListCell *l;
+ if (outer_inner->outer_inner_pair == NIL)
+ {
+ if (outer_inner->relation)
+ return true;
+ else
+ return false;
+ }
- while (*str != ')')
+ if (list_length(outer_inner->outer_inner_pair) == 2)
{
- char *relname;
+ foreach(l, outer_inner->outer_inner_pair)
+ {
+ if (!OuterInnerPairCheck(lfirst(l)))
+ return false;
+ }
+ }
+ else
+ return false;
- if ((str = parse_quote_value(str, &relname, "relation name", true))
- == NULL)
- return NULL;
+ return true;
+}
- hint->relations = lappend(hint->relations, relname);
+static List *
+OuterInnerList(OuterInnerRels *outer_inner)
+{
+ List *outer_inner_list = NIL;
+ ListCell *l;
+ OuterInnerRels *outer_inner_rels;
- skip_space(str);
+ foreach(l, outer_inner->outer_inner_pair)
+ {
+ outer_inner_rels = (OuterInnerRels *)(lfirst(l));
+
+ if (outer_inner_rels->relation != NULL)
+ outer_inner_list = lappend(outer_inner_list,
+ outer_inner_rels->relation);
+ else
+ outer_inner_list = list_concat(outer_inner_list,
+ OuterInnerList(outer_inner_rels));
}
+ return outer_inner_list;
+}
- /* テーブル指定が2つ未満の場合は、Leading ヒントはエラーとする */
- if (list_length(hint->relations) < 2)
+static const char *
+LeadingHintParse(LeadingHint *hint, HintState *hstate, Query *parse,
+ const char *str)
+{
+ List *name_list = NIL;
+ OuterInnerRels *outer_inner = NULL;
+
+ if ((str = parse_parentheses_Leading(str, &name_list, &outer_inner)) ==
+ NULL)
+ return NULL;
+
+ if (outer_inner != NULL)
+ name_list = OuterInnerList(outer_inner);
+
+ hint->relations = name_list;
+ hint->outer_inner = outer_inner;
+
+ /* A Leading hint requires at least two relations */
+ if ( hint->outer_inner == NULL && list_length(hint->relations) < 2)
+ {
+ hint_ereport(hint->base.hint_str,
+ ("%s hint requires at least two relations.",
+ HINT_LEADING));
+ hint->base.state = HINT_STATE_ERROR;
+ }
+ else if (hint->outer_inner != NULL &&
+ !OuterInnerPairCheck(hint->outer_inner))
{
- parse_ereport(hint->base.hint_str,
- ("%s hint requires at least two relations.",
- HINT_LEADING));
+ hint_ereport(hint->base.hint_str,
+ ("%s hint requires two sets of relations when parentheses nests.",
+ HINT_LEADING));
hint->base.state = HINT_STATE_ERROR;
}
}
static const char *
-SetHintParse(SetHint *hint, PlanHint *plan, Query *parse, const char *str)
+SetHintParse(SetHint *hint, HintState *hstate, Query *parse, const char *str)
{
- if ((str = parse_quote_value(str, &hint->name, "parameter name", true))
- == NULL ||
- (str = parse_quote_value(str, &hint->value, "parameter value", false))
+ List *name_list = NIL;
+
+ if ((str = parse_parentheses(str, &name_list, hint->base.hint_keyword))
== NULL)
return NULL;
+ hint->words = name_list;
+
+ /* We need both name and value to set GUC parameter. */
+ if (list_length(name_list) == 2)
+ {
+ hint->name = linitial(name_list);
+ hint->value = lsecond(name_list);
+ }
+ else
+ {
+ hint_ereport(hint->base.hint_str,
+ ("%s hint requires name and value of GUC parameter.",
+ HINT_SET));
+ hint->base.state = HINT_STATE_ERROR;
+ }
+
return str;
}
PG_TRY();
{
+#if PG_VERSION_NUM >= 90200
+ result = set_config_option(name, value, context, source,
+ action, changeVal, 0);
+#else
result = set_config_option(name, value, context, source,
action, changeVal);
+#endif
}
PG_CATCH();
{
if (enforce_mask == ENABLE_SEQSCAN || enforce_mask == ENABLE_INDEXSCAN ||
enforce_mask == ENABLE_BITMAPSCAN || enforce_mask == ENABLE_TIDSCAN
+#if PG_VERSION_NUM >= 90200
+ || enforce_mask == (ENABLE_INDEXSCAN | ENABLE_INDEXONLYSCAN)
+#endif
)
mask = enforce_mask;
else
SET_CONFIG_OPTION("enable_indexscan", ENABLE_INDEXSCAN);
SET_CONFIG_OPTION("enable_bitmapscan", ENABLE_BITMAPSCAN);
SET_CONFIG_OPTION("enable_tidscan", ENABLE_TIDSCAN);
+#if PG_VERSION_NUM >= 90200
+ SET_CONFIG_OPTION("enable_indexonlyscan", ENABLE_INDEXONLYSCAN);
+#endif
}
static void
{
Node *node;
- if (!pg_hint_plan_enable)
+ /*
+ * Use standard planner if pg_hint_plan is disabled or current nesting
+ * depth is nesting depth of SPI calls.
+ */
+ if (!pg_hint_plan_enable_hint || nested_level > 0)
{
if (prev_ProcessUtility)
(*prev_ProcessUtility) (parsetree, queryString, params,
if (IsA(node, ExplainStmt))
{
/*
- * EXPLAIN対象のクエリのパースツリーを取得する
+ * Draw out parse tree of actual query from Query struct of EXPLAIN
+ * statement.
*/
ExplainStmt *stmt;
Query *query;
}
/*
- * EXECUTEコマンドならば、PREPARE時に指定されたクエリ文字列を取得し、ヒント
- * 句の候補として設定する
+ * If the query was a EXECUTE or CREATE TABLE AS EXECUTE, get query string
+ * specified to preceding PREPARE command to use it as source of hints.
*/
if (IsA(node, ExecuteStmt))
{
stmt = (ExecuteStmt *) node;
stmt_name = stmt->name;
}
+#if PG_VERSION_NUM >= 90200
+ /*
+ * CREATE AS EXECUTE behavior has changed since 9.2, so we must handle it
+ * specially here.
+ */
+ if (IsA(node, CreateTableAsStmt))
+ {
+ CreateTableAsStmt *stmt;
+ Query *query;
+
+ stmt = (CreateTableAsStmt *) node;
+ Assert(IsA(stmt->query, Query));
+ query = (Query *) stmt->query;
+ if (query->commandType == CMD_UTILITY &&
+ IsA(query->utilityStmt, ExecuteStmt))
+ {
+ ExecuteStmt *estmt = (ExecuteStmt *) query->utilityStmt;
+ stmt_name = estmt->name;
+ }
+ }
+#endif
if (stmt_name)
{
PG_TRY();
}
/*
- * ヒント用スタック構造にヒントをプッシュする。なお、List構造体でヒント用スタッ
- * ク構造を実装していて、リストの先頭がスタックの一番上に該当する。
+ * Push a hint into hint stack which is implemented with List struct. Head of
+ * list is top of stack.
*/
static void
-push_hint(PlanHint *plan)
+push_hint(HintState *hstate)
{
- /* 新しいヒントをスタックに積む。 */
- PlanHintStack = lcons(plan, PlanHintStack);
+ /* Prepend new hint to the list means pushing to stack. */
+ HintStateStack = lcons(hstate, HintStateStack);
- /*
- * 先ほどスタックに積んだヒントを現在のヒントとしてcurrent_hintに格納する。
- */
- current_hint = plan;
+ /* Pushed hint is the one which should be used hereafter. */
+ current_hint = hstate;
}
+/* Pop a hint from hint stack. Popped hint is automatically discarded. */
static void
pop_hint(void)
{
- /* ヒントのスタックが空の場合はエラーを返す */
- if(PlanHintStack == NIL)
+ /* Hint stack must not be empty. */
+ if(HintStateStack == NIL)
elog(ERROR, "hint stack is empty");
/*
- * ヒントのスタックから一番上のものを取り出して解放する。 current_hint
- * 常に最上段ヒントを指すが、スタックが空の場合はNULLにする。
+ * Take a hint at the head from the list, and free it. Switch current_hint
+ * to point new head (NULL if the list is empty).
*/
- PlanHintStack = list_delete_first(PlanHintStack);
- PlanHintDelete(current_hint);
- if(PlanHintStack == NIL)
+ HintStateStack = list_delete_first(HintStateStack);
+ HintStateDelete(current_hint);
+ if(HintStateStack == NIL)
current_hint = NULL;
else
- current_hint = (PlanHint *) lfirst(list_head(PlanHintStack));
+ current_hint = (HintState *) lfirst(list_head(HintStateStack));
}
static PlannedStmt *
pg_hint_plan_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
{
+ const char *hints = NULL;
+ const char *query;
+ char *norm_query;
+ pgssJumbleState jstate;
+ int query_len;
int save_nestlevel;
PlannedStmt *result;
- PlanHint *plan;
+ HintState *hstate;
/*
- * pg_hint_planが無効である場合は通常のparser処理をおこなう。
- * 他のフック関数で実行されるhint処理をスキップするために、current_hint 変数
- * をNULLに設定しておく。
+ * Use standard planner if pg_hint_plan is disabled or current nesting
+ * depth is nesting depth of SPI calls. Other hook functions try to change
+ * plan with current_hint if any, so set it to NULL.
*/
- if (!pg_hint_plan_enable)
- {
- current_hint = NULL;
+ if (!pg_hint_plan_enable_hint || nested_level > 0)
+ goto standard_planner_proc;
- if (prev_planner)
- return (*prev_planner) (parse, cursorOptions, boundParams);
- else
- return standard_planner(parse, cursorOptions, boundParams);
- }
-
- /* 有効なヒント句を保存する。 */
- plan = parse_head_comment(parse);
+ /* Create hint struct from client-supplied query string. */
+ query = get_query_string();
/*
- * hintが指定されない、または空のhintを指定された場合は通常のparser処理をお
- * こなう。
- * 他のフック関数で実行されるhint処理をスキップするために、current_hint 変数
- * をNULLに設定しておく。
+ * Create hintstate from hint specified for the query, if any.
+ *
+ * First we lookup hint in pg_hint.hints table by normalized query string,
+ * unless pg_hint_plan.enable_hint_table is OFF.
+ * This parameter provides option to avoid overhead of table lookup during
+ * planning.
+ *
+ * If no hint was found, then we try to get hint from special query comment.
*/
- if (!plan)
+ if (pg_hint_plan_enable_hint_table)
{
- current_hint = NULL;
-
- if (prev_planner)
- return (*prev_planner) (parse, cursorOptions, boundParams);
- else
- return standard_planner(parse, cursorOptions, boundParams);
+ /*
+ * Search hint information which is stored for the query and the
+ * application. Query string is normalized before using in condition
+ * in order to allow fuzzy matching.
+ *
+ * XXX: normalizing code is copied from pg_stat_statements.c, so be
+ * careful when supporting PostgreSQL's version up.
+ */
+ jstate.jumble = (unsigned char *) palloc(JUMBLE_SIZE);
+ jstate.jumble_len = 0;
+ jstate.clocations_buf_size = 32;
+ jstate.clocations = (pgssLocationLen *)
+ palloc(jstate.clocations_buf_size * sizeof(pgssLocationLen));
+ jstate.clocations_count = 0;
+ JumbleQuery(&jstate, parse);
+ /*
+ * generate_normalized_query() copies exact given query_len bytes, so we
+ * add 1 byte for null-termination here. As comments on
+ * generate_normalized_query says, generate_normalized_query doesn't
+ * take care of null-terminate, but additional 1 byte ensures that '\0'
+ * byte in the source buffer to be copied into norm_query.
+ */
+ query_len = strlen(query) + 1;
+ norm_query = generate_normalized_query(&jstate,
+ query,
+ &query_len,
+ GetDatabaseEncoding());
+ hints = get_hints_from_table(norm_query, application_name);
+ elog(DEBUG1,
+ "pg_hint_plan: get_hints_from_table [%s][%s]=>[%s]",
+ norm_query, application_name, hints ? hints : "(none)");
}
+ if (hints == NULL)
+ hints = get_hints_from_comment(query);
+ hstate = create_hintstate(parse, hints);
- /* 現在のヒントをスタックに積む。 */
- push_hint(plan);
+ /*
+ * Use standard planner if the statement has not valid hint. Other hook
+ * functions try to change plan with current_hint if any, so set it to
+ * NULL.
+ */
+ if (!hstate)
+ goto standard_planner_proc;
+
+ /*
+ * Push new hint struct to the hint stack to disable previous hint context.
+ */
+ push_hint(hstate);
- /* Set hint で指定されたGUCパラメータを設定する */
+ /* Set GUC parameters which are specified with Set hint. */
save_nestlevel = set_config_options(current_hint->set_hints,
current_hint->num_hints[HINT_TYPE_SET],
current_hint->context);
current_hint->init_scan_mask |= ENABLE_BITMAPSCAN;
if (enable_tidscan)
current_hint->init_scan_mask |= ENABLE_TIDSCAN;
+#if PG_VERSION_NUM >= 90200
+ if (enable_indexonlyscan)
+ current_hint->init_scan_mask |= ENABLE_INDEXONLYSCAN;
+#endif
if (enable_nestloop)
current_hint->init_join_mask |= ENABLE_NESTLOOP;
if (enable_mergejoin)
current_hint->init_join_mask |= ENABLE_HASHJOIN;
/*
- * プラン作成中にエラーとなった場合、GUCパラメータと current_hintを
- * pg_hint_plan_planner 関数の実行前の状態に戻す。
+ * Use PG_TRY mechanism to recover GUC parameters and current_hint to the
+ * state when this planner started when error occurred in planner.
*/
PG_TRY();
{
PG_CATCH();
{
/*
- * プランナ起動前の状態に戻すため、GUCパラメータを復元し、ヒント情報を
- * 一つ削除する。
+ * Rollback changes of GUC parameters, and pop current hint context
+ * from hint stack to rewind the state.
*/
AtEOXact_GUC(true, save_nestlevel);
pop_hint();
}
PG_END_TRY();
- /*
- * Print hint if debugging.
- */
+ /* Print hint in debug mode. */
if (pg_hint_plan_debug_print)
- PlanHintDump(current_hint);
+ HintStateDump(current_hint);
/*
- * プランナ起動前の状態に戻すため、GUCパラメータを復元し、ヒント情報を一つ
- * 削除する。
+ * Rollback changes of GUC parameters, and pop current hint context from
+ * hint stack to rewind the state.
*/
AtEOXact_GUC(true, save_nestlevel);
pop_hint();
return result;
+
+standard_planner_proc:
+ current_hint = NULL;
+ if (prev_planner)
+ return (*prev_planner) (parse, cursorOptions, boundParams);
+ else
+ return standard_planner(parse, cursorOptions, boundParams);
}
/*
- * aliasnameと一致するSCANヒントを探す
+ * Return scan method hint which matches given aliasname.
*/
static ScanMethodHint *
find_scan_hint(PlannerInfo *root, RelOptInfo *rel)
int i;
/*
- * RELOPT_BASEREL でなければ、scan method ヒントが適用しない。
- * 子テーブルの場合はRELOPT_OTHER_MEMBER_RELとなるが、サポート対象外とする。
- * また、通常のリレーション以外は、スキャン方式を選択できない。
+ * We can't apply scan method hint if the relation is:
+ * - not a base relation
+ * - not an ordinary relation (such as join and subquery)
*/
if (rel->reloptkind != RELOPT_BASEREL || rel->rtekind != RTE_RELATION)
return NULL;
rte = root->simple_rte_array[rel->relid];
- /* 外部表はスキャン方式が選択できない。 */
+ /* We can't force scan method of foreign tables */
if (rte->relkind == RELKIND_FOREIGN_TABLE)
return NULL;
- /*
- * スキャン方式のヒントのリストから、検索対象のリレーションと名称が一致する
- * ヒントを検索する。
- */
+ /* Find scan method hint, which matches given names, from the list. */
for (i = 0; i < current_hint->num_hints[HINT_TYPE_SCAN_METHOD]; i++)
{
ScanMethodHint *hint = current_hint->scan_hints[i];
- /* すでに無効となっているヒントは検索対象にしない。 */
+ /* We ignore disabled hints. */
if (!hint_state_enabled(hint))
continue;
return NULL;
}
+/*
+ * regexeq
+ *
+ * Returns TRUE on match, FALSE on no match.
+ *
+ * s1 --- the data to match against
+ * s2 --- the pattern
+ *
+ * Because we copy s1 to NameData, make the size of s1 less than NAMEDATALEN.
+ */
+static bool
+regexpeq(const char *s1, const char *s2)
+{
+ NameData name;
+ text *regexp;
+ Datum result;
+
+ strcpy(name.data, s1);
+ regexp = cstring_to_text(s2);
+
+ result = DirectFunctionCall2Coll(nameregexeq,
+ DEFAULT_COLLATION_OID,
+ NameGetDatum(&name),
+ PointerGetDatum(regexp));
+ return DatumGetBool(result);
+}
+
static void
-delete_indexes(ScanMethodHint *hint, RelOptInfo *rel)
+delete_indexes(ScanMethodHint *hint, RelOptInfo *rel, Oid relationObjectId)
{
ListCell *cell;
ListCell *prev;
ListCell *next;
+ StringInfoData buf;
/*
* We delete all the IndexOptInfo list and prevent you from being usable by
* other than it.
*/
prev = NULL;
+ if (pg_hint_plan_debug_print)
+ initStringInfo(&buf);
+
for (cell = list_head(rel->indexlist); cell; cell = next)
{
IndexOptInfo *info = (IndexOptInfo *) lfirst(cell);
foreach(l, hint->indexnames)
{
- if (RelnameCmp(&indexname, &lfirst(l)) == 0)
+ char *hintname = (char *) lfirst(l);
+ bool result;
+
+ if (hint->regexp)
+ result = regexpeq(indexname, hintname);
+ else
+ result = RelnameCmp(&indexname, &hintname) == 0;
+
+ if (result)
{
use_index = true;
+ if (pg_hint_plan_debug_print)
+ {
+ appendStringInfoCharMacro(&buf, ' ');
+ quote_value(&buf, indexname);
+ }
+
+ break;
+ }
+ }
+
+ /*
+ * to make the index a candidate when definition of this index is
+ * matched with the index's definition of current_hint.
+ */
+ if (OidIsValid(relationObjectId) && !use_index)
+ {
+ foreach(l, current_hint->parent_index_infos)
+ {
+ int i;
+ HeapTuple ht_idx;
+ ParentIndexInfo *p_info = (ParentIndexInfo *)lfirst(l);
+
+ /* check to match the parameter of unique */
+ if (p_info->indisunique != info->unique)
+ continue;
+
+ /* check to match the parameter of index's method */
+ if (p_info->method != info->relam)
+ continue;
+
+ /* to check to match the indexkey's configuration */
+ if ((list_length(p_info->column_names)) !=
+ info->ncolumns)
+ continue;
+
+ /* check to match the indexkey's configuration */
+ for (i = 0; i < info->ncolumns; i++)
+ {
+ char *c_attname = NULL;
+ char *p_attname = NULL;
+
+ p_attname =
+ list_nth(p_info->column_names, i);
+
+ /* both are expressions */
+ if (info->indexkeys[i] == 0 && !p_attname)
+ continue;
+
+ /* one's column is expression, the other is not */
+ if (info->indexkeys[i] == 0 || !p_attname)
+ break;
+
+ c_attname = get_attname(relationObjectId,
+ info->indexkeys[i]);
+
+ if (strcmp(p_attname, c_attname) != 0)
+ break;
+
+ if (p_info->indcollation[i] != info->indexcollations[i])
+ break;
+
+ if (p_info->opclass[i] != info->opcintype[i])
+ break;
+
+ if (((p_info->indoption[i] & INDOPTION_DESC) != 0) !=
+ info->reverse_sort[i])
+ break;
+
+ if (((p_info->indoption[i] & INDOPTION_NULLS_FIRST) != 0) !=
+ info->nulls_first[i])
+ break;
+
+ }
+
+ if (i != info->ncolumns)
+ continue;
+
+ if ((p_info->expression_str && (info->indexprs != NIL)) ||
+ (p_info->indpred_str && (info->indpred != NIL)))
+ {
+ /*
+ * Fetch the pg_index tuple by the Oid of the index
+ */
+ ht_idx = SearchSysCache1(INDEXRELID,
+ ObjectIdGetDatum(info->indexoid));
+
+ /* check to match the expression's parameter of index */
+ if (p_info->expression_str &&
+ !heap_attisnull(ht_idx, Anum_pg_index_indexprs))
+ {
+ Datum exprsDatum;
+ bool isnull;
+ Datum result;
+
+ /*
+ * to change the expression's parameter of child's
+ * index to strings
+ */
+ exprsDatum = SysCacheGetAttr(INDEXRELID, ht_idx,
+ Anum_pg_index_indexprs,
+ &isnull);
+
+ result = DirectFunctionCall2(pg_get_expr,
+ exprsDatum,
+ ObjectIdGetDatum(
+ relationObjectId));
+
+ if (strcmp(p_info->expression_str,
+ text_to_cstring(DatumGetTextP(result))) != 0)
+ {
+ /* Clean up */
+ ReleaseSysCache(ht_idx);
+
+ continue;
+ }
+ }
+
+ /* Check to match the predicate's parameter of index */
+ if (p_info->indpred_str &&
+ !heap_attisnull(ht_idx, Anum_pg_index_indpred))
+ {
+ Datum predDatum;
+ bool isnull;
+ Datum result;
+
+ /*
+ * to change the predicate's parameter of child's
+ * index to strings
+ */
+ predDatum = SysCacheGetAttr(INDEXRELID, ht_idx,
+ Anum_pg_index_indpred,
+ &isnull);
+
+ result = DirectFunctionCall2(pg_get_expr,
+ predDatum,
+ ObjectIdGetDatum(
+ relationObjectId));
+
+ if (strcmp(p_info->indpred_str,
+ text_to_cstring(DatumGetTextP(result))) != 0)
+ {
+ /* Clean up */
+ ReleaseSysCache(ht_idx);
+
+ continue;
+ }
+ }
+
+ /* Clean up */
+ ReleaseSysCache(ht_idx);
+ }
+ else if (p_info->expression_str || (info->indexprs != NIL))
+ continue;
+ else if (p_info->indpred_str || (info->indpred != NIL))
+ continue;
+
+ use_index = true;
+
+ /* to log the candidate of index */
+ if (pg_hint_plan_debug_print)
+ {
+ appendStringInfoCharMacro(&buf, ' ');
+ quote_value(&buf, indexname);
+ }
+
break;
}
}
pfree(indexname);
}
+
+ if (pg_hint_plan_debug_print)
+ {
+ char *relname;
+ StringInfoData rel_buf;
+
+ if (OidIsValid(relationObjectId))
+ relname = get_rel_name(relationObjectId);
+ else
+ relname = hint->relname;
+
+ initStringInfo(&rel_buf);
+ quote_value(&rel_buf, relname);
+
+ ereport(LOG,
+ (errmsg("available indexes for %s(%s):%s",
+ hint->base.keyword,
+ rel_buf.data,
+ buf.data)));
+ pfree(buf.data);
+ pfree(rel_buf.data);
+ }
+}
+
+/*
+ * Return information of index definition.
+ */
+static ParentIndexInfo *
+get_parent_index_info(Oid indexoid, Oid relid)
+{
+ ParentIndexInfo *p_info = palloc(sizeof(ParentIndexInfo));
+ Relation indexRelation;
+ Form_pg_index index;
+ char *attname;
+ int i;
+
+ indexRelation = index_open(indexoid, RowExclusiveLock);
+
+ index = indexRelation->rd_index;
+
+ p_info->indisunique = index->indisunique;
+ p_info->method = indexRelation->rd_rel->relam;
+
+ p_info->column_names = NIL;
+ p_info->indcollation = (Oid *) palloc(sizeof(Oid) * index->indnatts);
+ p_info->opclass = (Oid *) palloc(sizeof(Oid) * index->indnatts);
+ p_info->indoption = (int16 *) palloc(sizeof(Oid) * index->indnatts);
+
+ for (i = 0; i < index->indnatts; i++)
+ {
+ attname = get_attname(relid, index->indkey.values[i]);
+ p_info->column_names = lappend(p_info->column_names, attname);
+
+ p_info->indcollation[i] = indexRelation->rd_indcollation[i];
+ p_info->opclass[i] = indexRelation->rd_opcintype[i];
+ p_info->indoption[i] = indexRelation->rd_indoption[i];
+ }
+
+ /*
+ * to check to match the expression's parameter of index with child indexes
+ */
+ p_info->expression_str = NULL;
+ if(!heap_attisnull(indexRelation->rd_indextuple, Anum_pg_index_indexprs))
+ {
+ Datum exprsDatum;
+ bool isnull;
+ Datum result;
+
+ exprsDatum = SysCacheGetAttr(INDEXRELID, indexRelation->rd_indextuple,
+ Anum_pg_index_indexprs, &isnull);
+
+ result = DirectFunctionCall2(pg_get_expr,
+ exprsDatum,
+ ObjectIdGetDatum(relid));
+
+ p_info->expression_str = text_to_cstring(DatumGetTextP(result));
+ }
+
+ /*
+ * to check to match the predicate's parameter of index with child indexes
+ */
+ p_info->indpred_str = NULL;
+ if(!heap_attisnull(indexRelation->rd_indextuple, Anum_pg_index_indpred))
+ {
+ Datum predDatum;
+ bool isnull;
+ Datum result;
+
+ predDatum = SysCacheGetAttr(INDEXRELID, indexRelation->rd_indextuple,
+ Anum_pg_index_indpred, &isnull);
+
+ result = DirectFunctionCall2(pg_get_expr,
+ predDatum,
+ ObjectIdGetDatum(relid));
+
+ p_info->indpred_str = text_to_cstring(DatumGetTextP(result));
+ }
+
+ index_close(indexRelation, NoLock);
+
+ return p_info;
}
static void
if (prev_get_relation_info)
(*prev_get_relation_info) (root, relationObjectId, inhparent, rel);
- /* 有効なヒントが指定されなかった場合は処理をスキップする。 */
- if (!current_hint)
+ /*
+ * Do nothing if we don't have valid hint in this context or current
+ * nesting depth is nesting depth of SPI calls.
+ */
+ if (!current_hint || nested_level > 0)
return;
if (inhparent)
{
/* store does relids of parent table. */
current_hint->parent_relid = rel->relid;
+ current_hint->parent_rel_oid = relationObjectId;
}
else if (current_hint->parent_relid != 0)
{
appinfo->child_relid == rel->relid)
{
if (current_hint->parent_hint)
- delete_indexes(current_hint->parent_hint, rel);
+ delete_indexes(current_hint->parent_hint, rel,
+ relationObjectId);
return;
}
/* This rel is not inherit table. */
current_hint->parent_relid = 0;
+ current_hint->parent_rel_oid = InvalidOid;
current_hint->parent_hint = NULL;
}
- /* scan hint が指定されない場合は、GUCパラメータをリセットする。 */
+ /*
+ * If scan method hint was given, reset GUC parameters which control
+ * planner behavior about choosing scan methods.
+ */
if ((hint = find_scan_hint(root, rel)) == NULL)
{
set_scan_config_options(current_hint->init_scan_mask,
}
set_scan_config_options(hint->enforce_mask, current_hint->context);
hint->base.state = HINT_STATE_USED;
+
if (inhparent)
+ {
+ Relation relation;
+ List *indexoidlist;
+ ListCell *l;
+
current_hint->parent_hint = hint;
- delete_indexes(hint, rel);
+ relation = heap_open(relationObjectId, NoLock);
+ indexoidlist = RelationGetIndexList(relation);
+
+ foreach(l, indexoidlist)
+ {
+ Oid indexoid = lfirst_oid(l);
+ char *indexname = get_rel_name(indexoid);
+ bool use_index = false;
+ ListCell *lc;
+ ParentIndexInfo *parent_index_info;
+
+ foreach(lc, hint->indexnames)
+ {
+ if (RelnameCmp(&indexname, &lfirst(lc)) == 0)
+ {
+ use_index = true;
+ break;
+ }
+ }
+ if (!use_index)
+ continue;
+
+ parent_index_info = get_parent_index_info(indexoid,
+ relationObjectId);
+ current_hint->parent_index_infos =
+ lappend(current_hint->parent_index_infos, parent_index_info);
+ }
+ heap_close(relation, NoLock);
+ }
+ else
+ delete_indexes(hint, rel, InvalidOid);
}
/*
- * aliasnameがクエリ中に指定した別名と一致する場合は、そのインデックスを返し、一
- * 致する別名がなければ0を返す。
- * aliasnameがクエリ中に複数回指定された場合は、-1を返す。
+ * Return index of relation which matches given aliasname, or 0 if not found.
+ * If same aliasname was used multiple times in a query, return -1.
*/
static int
find_relid_aliasname(PlannerInfo *root, char *aliasname, List *initial_rels,
Assert(i == root->simple_rel_array[i]->relid);
- if (RelnameCmp(&aliasname, &root->simple_rte_array[i]->eref->aliasname)
- != 0)
+ if (RelnameCmp(&aliasname,
+ &root->simple_rte_array[i]->eref->aliasname) != 0)
continue;
foreach(l, initial_rels)
if (found != 0)
{
- parse_ereport(str,
- ("Relation name \"%s\" is ambiguous.",
- aliasname));
+ hint_ereport(str,
+ ("Relation name \"%s\" is ambiguous.",
+ aliasname));
return -1;
}
}
/*
- * relidビットマスクと一致するヒントを探す
+ * Return join hint which matches given joinrelids.
*/
static JoinMethodHint *
find_join_hint(Relids joinrelids)
return NULL;
}
+static Relids
+OuterInnerJoinCreate(OuterInnerRels *outer_inner, LeadingHint *leading_hint,
+ PlannerInfo *root, List *initial_rels, HintState *hstate, int nbaserel)
+{
+ OuterInnerRels *outer_rels;
+ OuterInnerRels *inner_rels;
+ Relids outer_relids;
+ Relids inner_relids;
+ Relids join_relids;
+ JoinMethodHint *hint;
+
+ if (outer_inner->relation != NULL)
+ {
+ return bms_make_singleton(
+ find_relid_aliasname(root, outer_inner->relation,
+ initial_rels,
+ leading_hint->base.hint_str));
+ }
+
+ outer_rels = lfirst(outer_inner->outer_inner_pair->head);
+ inner_rels = lfirst(outer_inner->outer_inner_pair->tail);
+
+ outer_relids = OuterInnerJoinCreate(outer_rels,
+ leading_hint,
+ root,
+ initial_rels,
+ hstate,
+ nbaserel);
+ inner_relids = OuterInnerJoinCreate(inner_rels,
+ leading_hint,
+ root,
+ initial_rels,
+ hstate,
+ nbaserel);
+
+ join_relids = bms_add_members(outer_relids, inner_relids);
+
+ if (bms_num_members(join_relids) > nbaserel)
+ return join_relids;
+
+ /*
+ * If we don't have join method hint, create new one for the
+ * join combination with all join methods are enabled.
+ */
+ hint = find_join_hint(join_relids);
+ if (hint == NULL)
+ {
+ /*
+ * Here relnames is not set, since Relids bitmap is sufficient to
+ * control paths of this query afterward.
+ */
+ hint = (JoinMethodHint *) JoinMethodHintCreate(
+ leading_hint->base.hint_str,
+ HINT_LEADING,
+ HINT_KEYWORD_LEADING);
+ hint->base.state = HINT_STATE_USED;
+ hint->nrels = bms_num_members(join_relids);
+ hint->enforce_mask = ENABLE_ALL_JOIN;
+ hint->joinrelids = bms_copy(join_relids);
+ hint->inner_nrels = bms_num_members(inner_relids);
+ hint->inner_joinrelids = bms_copy(inner_relids);
+
+ hstate->join_hint_level[hint->nrels] =
+ lappend(hstate->join_hint_level[hint->nrels], hint);
+ }
+ else
+ {
+ hint->inner_nrels = bms_num_members(inner_relids);
+ hint->inner_joinrelids = bms_copy(inner_relids);
+ }
+
+ return join_relids;
+}
+
/*
- * 結合方式のヒントを使用しやすい構造に変換する。
+ * Transform join method hint into handy form.
+ *
+ * - create bitmap of relids from alias names, to make it easier to check
+ * whether a join path matches a join method hint.
+ * - add join method hints which are necessary to enforce join order
+ * specified by Leading hint
*/
-static void
-transform_join_hints(PlanHint *plan, PlannerInfo *root, int nbaserel,
+static bool
+transform_join_hints(HintState *hstate, PlannerInfo *root, int nbaserel,
List *initial_rels, JoinMethodHint **join_method_hints)
{
int i;
int relid;
- LeadingHint *lhint;
Relids joinrelids;
int njoinrels;
ListCell *l;
+ char *relname;
+ LeadingHint *lhint = NULL;
- for (i = 0; i < plan->num_hints[HINT_TYPE_JOIN_METHOD]; i++)
+ /*
+ * Create bitmap of relids from alias names for each join method hint.
+ * Bitmaps are more handy than strings in join searching.
+ */
+ for (i = 0; i < hstate->num_hints[HINT_TYPE_JOIN_METHOD]; i++)
{
- JoinMethodHint *hint = plan->join_hints[i];
+ JoinMethodHint *hint = hstate->join_hints[i];
int j;
if (!hint_state_enabled(hint) || hint->nrels > nbaserel)
relid = 0;
for (j = 0; j < hint->nrels; j++)
{
- char *relname = hint->relnames[j];
+ relname = hint->relnames[j];
relid = find_relid_aliasname(root, relname, initial_rels,
hint->base.hint_str);
if (bms_is_member(relid, hint->joinrelids))
{
- parse_ereport(hint->base.hint_str,
- ("Relation name \"%s\" is duplicated.", relname));
+ hint_ereport(hint->base.hint_str,
+ ("Relation name \"%s\" is duplicated.", relname));
hint->base.state = HINT_STATE_ERROR;
break;
}
if (relid <= 0 || hint->base.state == HINT_STATE_ERROR)
continue;
- plan->join_hint_level[hint->nrels] =
- lappend(plan->join_hint_level[hint->nrels], hint);
+ hstate->join_hint_level[hint->nrels] =
+ lappend(hstate->join_hint_level[hint->nrels], hint);
}
- /*
- * 有効なLeading ヒントが指定されている場合は、結合順にあわせて
- * join method hint のフォーマットに変換する。
- */
- if (plan->num_hints[HINT_TYPE_LEADING] == 0)
- return;
-
- lhint = plan->leading_hint;
- if (!hint_state_enabled(lhint))
- return;
+ /* Do nothing if no Leading hint was supplied. */
+ if (hstate->num_hints[HINT_TYPE_LEADING] == 0)
+ return false;
- /* Leading hint は、全ての join 方式が有効な hint として登録する */
- joinrelids = NULL;
- njoinrels = 0;
- foreach(l, lhint->relations)
+ /*
+ * Decide to use Leading hint。
+ */
+ for (i = 0; i < hstate->num_hints[HINT_TYPE_LEADING]; i++)
{
- char *relname = (char *)lfirst(l);
- JoinMethodHint *hint;
+ LeadingHint *leading_hint = (LeadingHint *)hstate->leading_hint[i];
+ Relids relids;
+
+ if (leading_hint->base.state == HINT_STATE_ERROR)
+ continue;
- relid =
- find_relid_aliasname(root, relname, initial_rels, plan->hint_str);
+ relid = 0;
+ relids = NULL;
- if (relid == -1)
+ foreach(l, leading_hint->relations)
{
- bms_free(joinrelids);
- return;
+ relname = (char *)lfirst(l);;
+
+ relid = find_relid_aliasname(root, relname, initial_rels,
+ leading_hint->base.hint_str);
+ if (relid == -1)
+ leading_hint->base.state = HINT_STATE_ERROR;
+
+ if (relid <= 0)
+ break;
+
+ if (bms_is_member(relid, relids))
+ {
+ hint_ereport(leading_hint->base.hint_str,
+ ("Relation name \"%s\" is duplicated.", relname));
+ leading_hint->base.state = HINT_STATE_ERROR;
+ break;
+ }
+
+ relids = bms_add_member(relids, relid);
}
- if (relid == 0)
+ if (relid <= 0 || leading_hint->base.state == HINT_STATE_ERROR)
continue;
- if (bms_is_member(relid, joinrelids))
+ if (lhint != NULL)
{
- parse_ereport(lhint->base.hint_str,
- ("Relation name \"%s\" is duplicated.", relname));
- lhint->base.state = HINT_STATE_ERROR;
- bms_free(joinrelids);
- return;
+ hint_ereport(lhint->base.hint_str,
+ ("Conflict %s hint.", HintTypeName[lhint->base.type]));
+ lhint->base.state = HINT_STATE_DUPLICATION;
}
+ leading_hint->base.state = HINT_STATE_USED;
+ lhint = leading_hint;
+ }
- joinrelids = bms_add_member(joinrelids, relid);
- njoinrels++;
-
- if (njoinrels < 2)
- continue;
+ /* check to exist Leading hint marked with 'used'. */
+ if (lhint == NULL)
+ return false;
- hint = find_join_hint(joinrelids);
- if (hint == NULL)
+ /*
+ * We need join method hints which fit specified join order in every join
+ * level. For example, Leading(A B C) virtually requires following join
+ * method hints, if no join method hint supplied:
+ * - level 1: none
+ * - level 2: NestLoop(A B), MergeJoin(A B), HashJoin(A B)
+ * - level 3: NestLoop(A B C), MergeJoin(A B C), HashJoin(A B C)
+ *
+ * If we already have join method hint which fits specified join order in
+ * that join level, we leave it as-is and don't add new hints.
+ */
+ joinrelids = NULL;
+ njoinrels = 0;
+ if (lhint->outer_inner == NULL)
+ {
+ foreach(l, lhint->relations)
{
+ JoinMethodHint *hint;
+
+ relname = (char *)lfirst(l);
+
/*
- * Here relnames is not set, since Relids bitmap is sufficient to
- * control paths of this query afterwards.
+ * Find relid of the relation which has given name. If we have the
+ * name given in Leading hint multiple times in the join, nothing to
+ * do.
*/
- hint = (JoinMethodHint *) JoinMethodHintCreate(lhint->base.hint_str,
- HINT_LEADING);
- hint->base.state = HINT_STATE_USED;
- hint->nrels = njoinrels;
- hint->enforce_mask = ENABLE_ALL_JOIN;
- hint->joinrelids = bms_copy(joinrelids);
- }
+ relid = find_relid_aliasname(root, relname, initial_rels,
+ hstate->hint_str);
- join_method_hints[njoinrels] = hint;
+ /* Create bitmap of relids for current join level. */
+ joinrelids = bms_add_member(joinrelids, relid);
+ njoinrels++;
- if (njoinrels >= nbaserel)
- break;
- }
+ /* We never have join method hint for single relation. */
+ if (njoinrels < 2)
+ continue;
- bms_free(joinrelids);
+ /*
+ * If we don't have join method hint, create new one for the
+ * join combination with all join methods are enabled.
+ */
+ hint = find_join_hint(joinrelids);
+ if (hint == NULL)
+ {
+ /*
+ * Here relnames is not set, since Relids bitmap is sufficient
+ * to control paths of this query afterward.
+ */
+ hint = (JoinMethodHint *) JoinMethodHintCreate(
+ lhint->base.hint_str,
+ HINT_LEADING,
+ HINT_KEYWORD_LEADING);
+ hint->base.state = HINT_STATE_USED;
+ hint->nrels = njoinrels;
+ hint->enforce_mask = ENABLE_ALL_JOIN;
+ hint->joinrelids = bms_copy(joinrelids);
+ }
- if (njoinrels < 2)
- return;
+ join_method_hints[njoinrels] = hint;
+
+ if (njoinrels >= nbaserel)
+ break;
+ }
+ bms_free(joinrelids);
- for (i = 2; i <= njoinrels; i++)
+ if (njoinrels < 2)
+ return false;
+
+ /*
+ * Delete all join hints which have different combination from Leading
+ * hint.
+ */
+ for (i = 2; i <= njoinrels; i++)
+ {
+ list_free(hstate->join_hint_level[i]);
+
+ hstate->join_hint_level[i] = lappend(NIL, join_method_hints[i]);
+ }
+ }
+ else
{
- /* Leading で指定した組み合わせ以外の join hint を削除する */
- list_free(plan->join_hint_level[i]);
+ joinrelids = OuterInnerJoinCreate(lhint->outer_inner,
+ lhint,
+ root,
+ initial_rels,
+ hstate,
+ nbaserel);
+
+ njoinrels = bms_num_members(joinrelids);
+ Assert(njoinrels >= 2);
+
+ /*
+ * Delete all join hints which have different combination from Leading
+ * hint.
+ */
+ for (i = 2;i <= njoinrels; i++)
+ {
+ if (hstate->join_hint_level[i] != NIL)
+ {
+ ListCell *prev = NULL;
+ ListCell *next = NULL;
+ for(l = list_head(hstate->join_hint_level[i]); l; l = next)
+ {
+
+ JoinMethodHint *hint = (JoinMethodHint *)lfirst(l);
+
+ next = lnext(l);
+
+ if (hint->inner_nrels == 0 &&
+ !(bms_intersect(hint->joinrelids, joinrelids) == NULL ||
+ bms_equal(bms_union(hint->joinrelids, joinrelids),
+ hint->joinrelids)))
+ {
+ hstate->join_hint_level[i] =
+ list_delete_cell(hstate->join_hint_level[i], l,
+ prev);
+ }
+ else
+ prev = l;
+ }
+ }
+ }
- plan->join_hint_level[i] = lappend(NIL, join_method_hints[i]);
+ bms_free(joinrelids);
}
if (hint_state_enabled(lhint))
+ {
set_join_config_options(DISABLE_ALL_JOIN, current_hint->context);
-
- lhint->base.state = HINT_STATE_USED;
-
+ return true;
+ }
+ return false;
}
/*
set_plain_rel_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
{
/* Consider sequential scan */
+#if PG_VERSION_NUM >= 90200
+ add_path(rel, create_seqscan_path(root, rel, NULL));
+#else
add_path(rel, create_seqscan_path(root, rel));
+#endif
/* Consider index scans */
create_index_paths(root, rel);
}
static void
-rebuild_scan_path(PlanHint *plan, PlannerInfo *root, int level,
+rebuild_scan_path(HintState *hstate, PlannerInfo *root, int level,
List *initial_rels)
{
ListCell *l;
RangeTblEntry *rte;
ScanMethodHint *hint;
- /*
- * スキャン方式が選択できるリレーションのみ、スキャンパスを再生成する。
- */
+ /* Skip relations which we can't choose scan method. */
if (rel->reloptkind != RELOPT_BASEREL || rel->rtekind != RTE_RELATION)
continue;
rte = root->simple_rte_array[rel->relid];
- /* 外部表はスキャン方式が選択できない。 */
+ /* We can't force scan method of foreign tables */
if (rte->relkind == RELKIND_FOREIGN_TABLE)
continue;
/*
- * scan method hint が指定されていなければ、初期値のGUCパラメータでscan
- * path を再生成する。
+ * Create scan paths with GUC parameters which are at the beginning of
+ * planner if scan method hint is not specified, otherwise use
+ * specified hints and mark the hint as used.
*/
if ((hint = find_scan_hint(root, rel)) == NULL)
- set_scan_config_options(plan->init_scan_mask, plan->context);
+ set_scan_config_options(hstate->init_scan_mask,
+ hstate->context);
else
{
- set_scan_config_options(hint->enforce_mask, plan->context);
+ set_scan_config_options(hint->enforce_mask, hstate->context);
hint->base.state = HINT_STATE_USED;
}
/*
* Restore the GUC variables we set above.
*/
- set_scan_config_options(plan->init_scan_mask, plan->context);
+ set_scan_config_options(hstate->init_scan_mask, hstate->context);
}
/*
- * make_join_rel() をラップする関数
+ * wrapper of make_join_rel()
*
- * ヒントにしたがって、enabele_* パラメータを変更した上で、make_join_rel()を
- * 呼び出す。
+ * call make_join_rel() after changing enable_* parameters according to given
+ * hints.
*/
static RelOptInfo *
make_join_rel_wrapper(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2)
if (!hint)
return pg_hint_plan_make_join_rel(root, rel1, rel2);
- save_nestlevel = NewGUCNestLevel();
+ if (hint->inner_nrels == 0)
+ {
+ save_nestlevel = NewGUCNestLevel();
- set_join_config_options(hint->enforce_mask, current_hint->context);
+ set_join_config_options(hint->enforce_mask, current_hint->context);
- rel = pg_hint_plan_make_join_rel(root, rel1, rel2);
- hint->base.state = HINT_STATE_USED;
+ rel = pg_hint_plan_make_join_rel(root, rel1, rel2);
+ hint->base.state = HINT_STATE_USED;
- /*
- * Restore the GUC variables we set above.
- */
- AtEOXact_GUC(true, save_nestlevel);
+ /*
+ * Restore the GUC variables we set above.
+ */
+ AtEOXact_GUC(true, save_nestlevel);
+ }
+ else
+ rel = pg_hint_plan_make_join_rel(root, rel1, rel2);
return rel;
}
+/*
+ * TODO : comment
+ */
+static void
+add_paths_to_joinrel_wrapper(PlannerInfo *root,
+ RelOptInfo *joinrel,
+ RelOptInfo *outerrel,
+ RelOptInfo *innerrel,
+ JoinType jointype,
+ SpecialJoinInfo *sjinfo,
+ List *restrictlist)
+{
+ ScanMethodHint *scan_hint = NULL;
+ Relids joinrelids;
+ JoinMethodHint *join_hint;
+ int save_nestlevel;
+
+ if ((scan_hint = find_scan_hint(root, innerrel)) != NULL)
+ {
+ set_scan_config_options(scan_hint->enforce_mask, current_hint->context);
+ scan_hint->base.state = HINT_STATE_USED;
+ }
+
+ joinrelids = bms_union(outerrel->relids, innerrel->relids);
+ join_hint = find_join_hint(joinrelids);
+ bms_free(joinrelids);
+
+ if (join_hint && join_hint->inner_nrels != 0)
+ {
+ save_nestlevel = NewGUCNestLevel();
+
+ if (bms_equal(join_hint->inner_joinrelids, innerrel->relids))
+ {
+
+ set_join_config_options(join_hint->enforce_mask,
+ current_hint->context);
+
+ add_paths_to_joinrel(root, joinrel, outerrel, innerrel, jointype,
+ sjinfo, restrictlist);
+ join_hint->base.state = HINT_STATE_USED;
+ }
+ else
+ {
+ set_join_config_options(DISABLE_ALL_JOIN, current_hint->context);
+ add_paths_to_joinrel(root, joinrel, outerrel, innerrel, jointype,
+ sjinfo, restrictlist);
+ }
+
+ /*
+ * Restore the GUC variables we set above.
+ */
+ AtEOXact_GUC(true, save_nestlevel);
+ }
+ else
+ add_paths_to_joinrel(root, joinrel, outerrel, innerrel, jointype,
+ sjinfo, restrictlist);
+
+ if (scan_hint != NULL)
+ set_scan_config_options(current_hint->init_scan_mask,
+ current_hint->context);
+}
+
static int
get_num_baserels(List *initial_rels)
{
else
{
/* other values not expected here */
- elog(ERROR, "Unrecognized reloptkind type: %d", rel->reloptkind);
+ elog(ERROR, "unrecognized reloptkind type: %d", rel->reloptkind);
}
}
pg_hint_plan_join_search(PlannerInfo *root, int levels_needed,
List *initial_rels)
{
- JoinMethodHint **join_method_hints;
- int nbaserel;
- RelOptInfo *rel;
- int i;
+ JoinMethodHint **join_method_hints;
+ int nbaserel;
+ RelOptInfo *rel;
+ int i;
+ bool leading_hint_enable;
/*
- * pg_hint_planが無効、または有効なヒントが1つも指定されなかった場合は、標準
- * の処理を行う。
+ * Use standard planner (or geqo planner) if pg_hint_plan is disabled or no
+ * valid hint is supplied or current nesting depth is nesting depth of SPI
+ * calls.
*/
- if (!current_hint)
+ if (!current_hint || nested_level > 0)
{
if (prev_join_search)
return (*prev_join_search) (root, levels_needed, initial_rels);
rebuild_scan_path(current_hint, root, levels_needed, initial_rels);
/*
- * GEQOを使用する条件を満たした場合は、GEQOを用いた結合方式の検索を行う。
- * このとき、スキャン方式のヒントとSetヒントのみが有効になり、結合方式や結合
- * 順序はヒント句は無効になりGEQOのアルゴリズムで決定される。
+ * In the case using GEQO, only scan method hints and Set hints have
+ * effect. Join method and join order is not controllable by hints.
*/
if (enable_geqo && levels_needed >= geqo_threshold)
return geqo(root, levels_needed, initial_rels);
current_hint->join_hint_level = palloc0(sizeof(List *) * (nbaserel + 1));
join_method_hints = palloc0(sizeof(JoinMethodHint *) * (nbaserel + 1));
- transform_join_hints(current_hint, root, nbaserel, initial_rels,
- join_method_hints);
+ leading_hint_enable = transform_join_hints(current_hint, root, nbaserel,
+ initial_rels, join_method_hints);
rel = pg_hint_plan_standard_join_search(root, levels_needed, initial_rels);
pfree(current_hint->join_hint_level);
pfree(join_method_hints);
- if (current_hint->num_hints[HINT_TYPE_LEADING] > 0 &&
- hint_state_enabled(current_hint->leading_hint))
- set_join_config_options(current_hint->init_join_mask, current_hint->context);
+ if (leading_hint_enable)
+ set_join_config_options(current_hint->init_join_mask,
+ current_hint->context);
return rel;
}
set_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
Index rti, RangeTblEntry *rte)
{
+#if PG_VERSION_NUM >= 90200
+ if (IS_DUMMY_REL(rel))
+ {
+ /* We already proved the relation empty, so nothing more to do */
+ }
+ else if (rte->inh)
+#else
if (rte->inh)
+#endif
{
/* It's an "append relation", process accordingly */
set_append_rel_pathlist(root, rel, rti, rte);
set_plain_rel_pathlist(root, rel, rte);
}
else
- elog(ERROR, "Unexpected relkind: %c", rte->relkind);
+ elog(ERROR, "unexpected relkind: %c", rte->relkind);
}
else
- elog(ERROR, "Unexpected rtekind: %d", (int) rel->rtekind);
+ elog(ERROR, "unexpected rtekind: %d", (int) rel->rtekind);
}
}
+/*
+ * stmt_beg callback is called when each query in PL/pgSQL function is about
+ * to be executed. At that timing, we save query string in the global variable
+ * plpgsql_query_string to use it in planner hook. It's safe to use one global
+ * variable for the purpose, because its content is only necessary until
+ * planner hook is called for the query, so recursive PL/pgSQL function calls
+ * don't harm this mechanism.
+ */
+static void
+pg_hint_plan_plpgsql_stmt_beg(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt)
+{
+ if ((enum PLpgSQL_stmt_types) stmt->cmd_type == PLPGSQL_STMT_EXECSQL)
+ {
+ PLpgSQL_expr *expr = ((PLpgSQL_stmt_execsql *) stmt)->sqlstmt;
+ plpgsql_query_string = expr->query;
+ }
+}
+
+/*
+ * stmt_end callback is called then each query in PL/pgSQL function has
+ * finished. At that timing, we clear plpgsql_query_string to tell planner
+ * hook that next call is not for a query written in PL/pgSQL block.
+ */
+static void
+pg_hint_plan_plpgsql_stmt_end(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt)
+{
+ if ((enum PLpgSQL_stmt_types) stmt->cmd_type == PLPGSQL_STMT_EXECSQL)
+ plpgsql_query_string = NULL;
+}
+
#define standard_join_search pg_hint_plan_standard_join_search
#define join_search_one_level pg_hint_plan_join_search_one_level
#define make_join_rel make_join_rel_wrapper
#undef make_join_rel
#define make_join_rel pg_hint_plan_make_join_rel
-#define add_paths_to_joinrel(root, joinrel, outerrel, innerrel, jointype, sjinfo, restrictlist) \
-do { \
- ScanMethodHint *hint = NULL; \
- if ((hint = find_scan_hint((root), (innerrel))) != NULL) \
- { \
- set_scan_config_options(hint->enforce_mask, current_hint->context); \
- hint->base.state = HINT_STATE_USED; \
- } \
- add_paths_to_joinrel((root), (joinrel), (outerrel), (innerrel), (jointype), (sjinfo), (restrictlist)); \
- if (hint != NULL) \
- set_scan_config_options(current_hint->init_scan_mask, current_hint->context); \
-} while(0)
+#define add_paths_to_joinrel add_paths_to_joinrel_wrapper
#include "make_join_rel.c"
+
+#include "pg_stat_statements.c"
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