* do instructions or hints to the planner using C-style block comments
* of the SQL.
*
- * Copyright (c) 2012-2013, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2014, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
#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.
+ */
#include "plpgsql.h"
+/* partially copied from pg_stat_statements */
+#include "normalize_query.h"
+
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif
-#if PG_VERSION_NUM < 90100
-#error unsupported PostgreSQL version
-#endif
-
#define BLOCK_COMMENT_START "/*"
#define BLOCK_COMMENT_END "*/"
#define HINT_COMMENT_KEYWORD "+"
#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_NOHASHJOIN "NoHashJoin"
#define HINT_LEADING "Leading"
#define HINT_SET "Set"
+#define HINT_ROWS "Rows"
#define HINT_ARRAY_DEFAULT_INITSIZE 8
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;
-#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_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_NOHASHJOIN,
HINT_KEYWORD_LEADING,
HINT_KEYWORD_SET,
+ HINT_KEYWORD_ROWS,
HINT_KEYWORD_UNRECOGNIZED
} HintKeyword;
Query *parse, const char *str);
/* hint types */
-#define NUM_HINT_TYPE 4
+#define NUM_HINT_TYPE 5
typedef enum HintType
{
HINT_TYPE_SCAN_METHOD,
HINT_TYPE_JOIN_METHOD,
HINT_TYPE_LEADING,
- HINT_TYPE_SET
+ HINT_TYPE_SET,
+ HINT_TYPE_ROWS,
} HintType;
static const char *HintTypeName[] = {
"scan method",
"join method",
"leading",
- "set"
+ "set",
+ "rows",
};
/* hint status */
List *words;
} SetHint;
+/* rows hints */
+typedef enum RowsValueType {
+ RVT_ABSOLUTE, /* Rows(... #1000) */
+ RVT_ADD, /* Rows(... +1000) */
+ RVT_SUB, /* Rows(... -1000) */
+ RVT_MULTI, /* Rows(... *1.2) */
+} RowsValueType;
+typedef struct RowsHint
+{
+ Hint base;
+ int nrels;
+ int inner_nrels;
+ char **relnames;
+ Relids joinrelids;
+ Relids inner_joinrelids;
+ char *rows_str;
+ RowsValueType value_type;
+ double rows;
+} RowsHint;
+
/*
* Describes a context of hint processing.
*/
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; /* infomation of inherit parent table's
+ List *parent_index_infos; /* information of inherit parent table's
* index */
/* for join method hints */
/* for Set hints */
SetHint **set_hints; /* parsed Set hints */
GucContext context; /* which GUC parameters can we set? */
+
+ /* for Rows hints */
+ RowsHint **rows_hints; /* parsed Rows hints */
};
/*
void _PG_init(void);
void _PG_fini(void);
-void set_plpgsql_plugin(void);
-
static void push_hint(HintState *hstate);
static void pop_hint(void);
static int SetHintCmp(const SetHint *a, const SetHint *b);
static const char *SetHintParse(SetHint *hint, HintState *hstate, Query *parse,
const char *str);
+static Hint *RowsHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword);
+static void RowsHintDelete(RowsHint *hint);
+static void RowsHintDesc(RowsHint *hint, StringInfo buf);
+static int RowsHintCmp(const RowsHint *a, const RowsHint *b);
+static const char *RowsHintParse(RowsHint *hint, HintState *hstate,
+ Query *parse, const char *str);
+static Hint *LeadingHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword);
static void quote_value(StringInfo buf, const char *value);
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 Path *get_cheapest_parameterized_child_path(PlannerInfo *root,
+ RelOptInfo *rel,
+ Relids required_outer);
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_func_setup(PLpgSQL_execstate *estate,
- PLpgSQL_stmt *stmt);
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,
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},
{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_NOHASHJOIN, JoinMethodHintCreate, HINT_KEYWORD_NOHASHJOIN},
{HINT_LEADING, LeadingHintCreate, HINT_KEYWORD_LEADING},
{HINT_SET, SetHintCreate, HINT_KEYWORD_SET},
+ {HINT_ROWS, RowsHintCreate, HINT_KEYWORD_ROWS},
{NULL, NULL, HINT_KEYWORD_UNRECOGNIZED}
};
-const char *hint_query_string = NULL;
-PLpgSQL_plugin **plugin_funcs = NULL;
+/*
+ * 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_hint",
"Force planner to use plans specified in the hint comment preceding to the query.",
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;
prev_join_search = join_search_hook;
join_search_hook = pg_hint_plan_join_search;
- /* PL/pgSQL plugin hook */
- set_plpgsql_plugin();
- plugin_funcs =
- (PLpgSQL_plugin **) find_rendezvous_variable("PLpgSQL_plugin");
+ /* 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;
-}
-
-void
-set_plpgsql_plugin(void)
-{
- plugin_funcs = palloc(sizeof(void *));
- *plugin_funcs = palloc(sizeof(PLpgSQL_plugin));
- (*plugin_funcs)->func_setup = (void *)pg_hint_plan_plpgsql_func_setup;
- (*plugin_funcs)->func_beg = NULL;
- (*plugin_funcs)->func_end = NULL;
- (*plugin_funcs)->stmt_beg = NULL;
- (*plugin_funcs)->stmt_end = NULL;
- (*plugin_funcs)->error_callback = NULL;
- (*plugin_funcs)->assign_expr = NULL;
+ /* uninstall PL/pgSQL plugin hook */
+ var_ptr = (PLpgSQL_plugin **) find_rendezvous_variable("PLpgSQL_plugin");
+ *var_ptr = NULL;
}
/*
pfree(hint);
}
+static Hint *
+RowsHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword)
+{
+ RowsHint *hint;
+
+ hint = palloc(sizeof(RowsHint));
+ hint->base.hint_str = hint_str;
+ hint->base.keyword = keyword;
+ hint->base.hint_keyword = hint_keyword;
+ hint->base.type = HINT_TYPE_ROWS;
+ hint->base.state = HINT_STATE_NOTUSED;
+ hint->base.delete_func = (HintDeleteFunction) RowsHintDelete;
+ hint->base.desc_func = (HintDescFunction) RowsHintDesc;
+ hint->base.cmp_func = (HintCmpFunction) RowsHintCmp;
+ hint->base.parse_func = (HintParseFunction) RowsHintParse;
+ hint->nrels = 0;
+ hint->inner_nrels = 0;
+ hint->relnames = NULL;
+ hint->joinrelids = NULL;
+ hint->inner_joinrelids = NULL;
+ hint->rows_str = NULL;
+ hint->value_type = RVT_ABSOLUTE;
+ hint->rows = 0;
+
+ return (Hint *) hint;
+}
+
+static void
+RowsHintDelete(RowsHint *hint)
+{
+ if (!hint)
+ return;
+
+ if (hint->relnames)
+ {
+ int i;
+
+ for (i = 0; i < hint->nrels; i++)
+ pfree(hint->relnames[i]);
+ pfree(hint->relnames);
+ }
+
+ bms_free(hint->joinrelids);
+ bms_free(hint->inner_joinrelids);
+ pfree(hint);
+}
+
static HintState *
HintStateCreate(void)
{
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->leading_hint = NULL;
hstate->context = superuser() ? PGC_SUSET : PGC_USERSET;
hstate->set_hints = NULL;
+ hstate->rows_hints = NULL;
return hstate;
}
appendStringInfo(buf, ")\n");
}
+static void
+RowsHintDesc(RowsHint *hint, StringInfo buf)
+{
+ int i;
+
+ appendStringInfo(buf, "%s(", hint->base.keyword);
+ if (hint->relnames != NULL)
+ {
+ quote_value(buf, hint->relnames[0]);
+ for (i = 1; i < hint->nrels; i++)
+ {
+ appendStringInfoCharMacro(buf, ' ');
+ quote_value(buf, hint->relnames[i]);
+ }
+ }
+ appendStringInfo(buf, " %s", hint->rows_str);
+ appendStringInfoString(buf, ")\n");
+
+}
+
/*
- * Append string which repserents all hints in a given state to buf, with
+ * Append string which represents all hints in a given state to buf, with
* preceding title with them.
*/
static void
}
static int
+RowsHintCmp(const RowsHint *a, const RowsHint *b)
+{
+ int i;
+
+ if (a->nrels != b->nrels)
+ return a->nrels - b->nrels;
+
+ for (i = 0; i < a->nrels; i++)
+ {
+ int result;
+ if ((result = RelnameCmp(&a->relnames[i], &b->relnames[i])) != 0)
+ return result;
+ }
+
+ return 0;
+}
+
+static int
HintCmp(const void *a, const void *b)
{
const Hint *hinta = *((const Hint **) a);
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)
{
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 HintState *
-parse_head_comment(Query *parse)
+static const char *
+get_query_string(void)
{
const char *p;
- const char *hint_head;
- char *head;
- char *tail;
- int len;
- int i;
- HintState *hstate;
- /* get client-supplied query string. */
if (stmt_name)
{
PreparedStatement *entry;
entry = FetchPreparedStatement(stmt_name, true);
p = entry->plansource->query_string;
}
- else if (hint_query_string)
- p = hint_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;
head[len] = '\0';
p = head;
+ return 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;
+
+ if (hints == NULL)
+ return NULL;
+
+ p = hints;
hstate = HintStateCreate();
- hstate->hint_str = head;
+ hstate->hint_str = (char *) hints;
/* parse each hint. */
parse_hints(hstate, parse, p);
/*
* If an object (or a set of objects) has multiple hints of same hint-type,
- * only the last hint is valid and others are igonred in planning.
+ * 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++)
hstate->num_hints[HINT_TYPE_JOIN_METHOD]);
hstate->set_hints = (SetHint **) (hstate->leading_hint +
hstate->num_hints[HINT_TYPE_LEADING]);
+ hstate->rows_hints = (RowsHint **) (hstate->set_hints +
+ hstate->num_hints[HINT_TYPE_SET]);
return hstate;
}
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)
{
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_NOINDEXONLYSCAN:
hint->enforce_mask = ENABLE_ALL_SCAN ^ ENABLE_INDEXONLYSCAN;
break;
-#endif
default:
hint_ereport(str, ("Unrecognized hint keyword \"%s\".", keyword));
return NULL;
return str;
}
+static const char *
+RowsHintParse(RowsHint *hint, HintState *hstate, Query *parse,
+ const char *str)
+{
+ HintKeyword hint_keyword = hint->base.hint_keyword;
+ List *name_list = NIL;
+ char *rows_str;
+ char *end_ptr;
+
+ if ((str = parse_parentheses(str, &name_list, hint_keyword)) == NULL)
+ return NULL;
+
+ /* Last element must be rows specification */
+ hint->nrels = list_length(name_list) - 1;
+
+ if (hint->nrels > 0)
+ {
+ ListCell *l;
+ int i = 0;
+
+ /*
+ * Transform relation names from list to array to sort them with qsort
+ * after.
+ */
+ hint->relnames = palloc(sizeof(char *) * hint->nrels);
+ foreach (l, name_list)
+ {
+ if (hint->nrels <= i)
+ break;
+ hint->relnames[i] = lfirst(l);
+ i++;
+ }
+ }
+
+ /* Retieve rows estimation */
+ rows_str = list_nth(name_list, hint->nrels);
+ hint->rows_str = rows_str; /* store as-is for error logging */
+ if (rows_str[0] == '#')
+ {
+ hint->value_type = RVT_ABSOLUTE;
+ rows_str++;
+ }
+ else if (rows_str[0] == '+')
+ {
+ hint->value_type = RVT_ADD;
+ rows_str++;
+ }
+ else if (rows_str[0] == '-')
+ {
+ hint->value_type = RVT_SUB;
+ rows_str++;
+ }
+ else if (rows_str[0] == '*')
+ {
+ hint->value_type = RVT_MULTI;
+ rows_str++;
+ }
+ else
+ {
+ hint_ereport(rows_str, ("Unrecognized rows value type notation."));
+ hint->base.state = HINT_STATE_ERROR;
+ return str;
+ }
+ hint->rows = strtod(rows_str, &end_ptr);
+ if (*end_ptr)
+ {
+ hint_ereport(rows_str,
+ ("%s hint requires valid number as rows estimation.",
+ hint->base.keyword));
+ hint->base.state = HINT_STATE_ERROR;
+ return str;
+ }
+
+ /* A join hint requires at least two relations */
+ if (hint->nrels < 2)
+ {
+ hint_ereport(str,
+ ("%s hint requires at least two relations.",
+ hint->base.keyword));
+ hint->base.state = HINT_STATE_ERROR;
+ return str;
+ }
+
+ list_free(name_list);
+
+ /* Sort relnames in alphabetical order. */
+ qsort(hint->relnames, hint->nrels, sizeof(char *), RelnameCmp);
+
+ return str;
+}
+
/*
* set GUC parameter functions
*/
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_hint)
+ /*
+ * 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,
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.
stmt_name = estmt->name;
}
}
-#endif
+
if (stmt_name)
{
PG_TRY();
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;
HintState *hstate;
/*
- * Use standard planner if pg_hint_plan is disabled. Other hook functions
- * try to change plan with current_hint if any, so set it to NULL.
+ * 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_hint)
- {
- 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);
- }
+ /* Create hint struct from client-supplied query string. */
+ query = get_query_string();
- /* Create hint struct from parse tree. */
- hstate = parse_head_comment(parse);
+ /*
+ * 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 (pg_hint_plan_enable_hint_table)
+ {
+ /*
+ * 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);
/*
* Use standard planner if the statement has not valid hint. Other hook
* NULL.
*/
if (!hstate)
- {
- current_hint = NULL;
-
- if (prev_planner)
- return (*prev_planner) (parse, cursorOptions, boundParams);
- else
- return standard_planner(parse, cursorOptions, boundParams);
- }
+ goto standard_planner_proc;
/*
* Push new hint struct to the hint stack to disable previous 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)
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);
}
/*
}
}
- /* Check to match the predicate's paraameter of index */
+ /* Check to match the predicate's parameter of index */
if (p_info->indpred_str &&
!heap_attisnull(ht_idx, Anum_pg_index_indpred))
{
Datum result;
/*
- * to change the predicate's parabeter of child's
+ * to change the predicate's parameter of child's
* index to strings
*/
predDatum = SysCacheGetAttr(INDEXRELID, ht_idx,
}
/*
- * to check to match the expression's paraameter of index with child indexes
+ * 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))
}
/*
- * to check to match the predicate's paraameter of index with child indexes
+ * 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))
if (prev_get_relation_info)
(*prev_get_relation_info) (root, relationObjectId, inhparent, rel);
- /* Do nothing if we don't have valid hint in this context. */
- 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)
{
/* This rel is not inherit table. */
current_hint->parent_relid = 0;
- current_hint->parent_rel_oid = InvalidOid;
current_hint->parent_hint = NULL;
}
return join_relids;
}
+static Relids
+create_bms_of_relids(Hint *base, PlannerInfo *root, List *initial_rels,
+ int nrels, char **relnames)
+{
+ int relid;
+ Relids relids = NULL;
+ int j;
+ char *relname;
+
+ for (j = 0; j < nrels; j++)
+ {
+ relname = relnames[j];
+
+ relid = find_relid_aliasname(root, relname, initial_rels,
+ base->hint_str);
+
+ if (relid == -1)
+ base->state = HINT_STATE_ERROR;
+
+ /*
+ * the aliasname is not found(relid == 0) or same aliasname was used
+ * multiple times in a query(relid == -1)
+ */
+ if (relid <= 0)
+ {
+ relids = NULL;
+ break;
+ }
+ if (bms_is_member(relid, relids))
+ {
+ hint_ereport(base->hint_str,
+ ("Relation name \"%s\" is duplicated.", relname));
+ base->state = HINT_STATE_ERROR;
+ break;
+ }
+
+ relids = bms_add_member(relids, relid);
+ }
+ return relids;
+}
/*
* Transform join method hint into handy form.
*
for (i = 0; i < hstate->num_hints[HINT_TYPE_JOIN_METHOD]; i++)
{
JoinMethodHint *hint = hstate->join_hints[i];
- int j;
if (!hint_state_enabled(hint) || hint->nrels > nbaserel)
continue;
- bms_free(hint->joinrelids);
- hint->joinrelids = NULL;
- relid = 0;
- for (j = 0; j < hint->nrels; j++)
- {
- relname = hint->relnames[j];
-
- relid = find_relid_aliasname(root, relname, initial_rels,
- hint->base.hint_str);
-
- if (relid == -1)
- hint->base.state = HINT_STATE_ERROR;
+ hint->joinrelids = create_bms_of_relids(&(hint->base), root,
+ initial_rels, hint->nrels, hint->relnames);
- if (relid <= 0)
- break;
+ if (hint->joinrelids == NULL || hint->base.state == HINT_STATE_ERROR)
+ continue;
- if (bms_is_member(relid, hint->joinrelids))
- {
- hint_ereport(hint->base.hint_str,
- ("Relation name \"%s\" is duplicated.", relname));
- hint->base.state = HINT_STATE_ERROR;
- break;
- }
+ hstate->join_hint_level[hint->nrels] =
+ lappend(hstate->join_hint_level[hint->nrels], hint);
+ }
- hint->joinrelids = bms_add_member(hint->joinrelids, relid);
- }
+ /*
+ * Create bitmap of relids from alias names for each rows hint.
+ * Bitmaps are more handy than strings in join searching.
+ */
+ for (i = 0; i < hstate->num_hints[HINT_TYPE_ROWS]; i++)
+ {
+ RowsHint *hint = hstate->rows_hints[i];
- if (relid <= 0 || hint->base.state == HINT_STATE_ERROR)
+ if (!hint_state_enabled(hint) || hint->nrels > nbaserel)
continue;
- hstate->join_hint_level[hint->nrels] =
- lappend(hstate->join_hint_level[hint->nrels], hint);
+ hint->joinrelids = create_bms_of_relids(&(hint->base), root,
+ initial_rels, hint->nrels, hint->relnames);
}
/* Do nothing if no Leading hint was supplied. */
ListCell *next = NULL;
for(l = list_head(hstate->join_hint_level[i]); l; l = next)
{
-
JoinMethodHint *hint = (JoinMethodHint *)lfirst(l);
next = lnext(l);
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);
}
joinrelids = bms_union(outerrel->relids, innerrel->relids);
+
join_hint = find_join_hint(joinrelids);
bms_free(joinrelids);
/*
* Use standard planner (or geqo planner) if pg_hint_plan is disabled or no
- * valid hint is supplied.
+ * 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);
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);
}
}
-static void
-pg_hint_plan_plpgsql_func_setup(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt)
-{
- (*plugin_funcs)->stmt_beg = pg_hint_plan_plpgsql_stmt_beg;
- (*plugin_funcs)->stmt_end = pg_hint_plan_plpgsql_stmt_end;
-}
-
+/*
+ * 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 = NULL;
+
+ switch ((enum PLpgSQL_stmt_types) stmt->cmd_type)
{
- PLpgSQL_expr *expr = ((PLpgSQL_stmt_execsql *) stmt)->sqlstmt;
- hint_query_string = expr->query;
+ case PLPGSQL_STMT_FORS:
+ expr = ((PLpgSQL_stmt_fors *) stmt)->query;
+ break;
+ case PLPGSQL_STMT_FORC:
+ expr = ((PLpgSQL_var *) (estate->datums[((PLpgSQL_stmt_forc *)stmt)->curvar]))->cursor_explicit_expr;
+ break;
+ case PLPGSQL_STMT_RETURN_QUERY:
+ if (((PLpgSQL_stmt_return_query *) stmt)->query != NULL)
+ expr = ((PLpgSQL_stmt_return_query *) stmt)->query;
+ else
+ expr = ((PLpgSQL_stmt_return_query *) stmt)->dynquery;
+ break;
+ case PLPGSQL_STMT_EXECSQL:
+ expr = ((PLpgSQL_stmt_execsql *) stmt)->sqlstmt;
+ break;
+ case PLPGSQL_STMT_DYNEXECUTE:
+ expr = ((PLpgSQL_stmt_dynexecute *) stmt)->query;
+ break;
+ case PLPGSQL_STMT_DYNFORS:
+ expr = ((PLpgSQL_stmt_dynfors *) stmt)->query;
+ break;
+ case PLPGSQL_STMT_OPEN:
+ if (((PLpgSQL_stmt_open *) stmt)->query != NULL)
+ expr = ((PLpgSQL_stmt_open *) stmt)->query;
+ else if (((PLpgSQL_stmt_open *) stmt)->dynquery != NULL)
+ expr = ((PLpgSQL_stmt_open *) stmt)->dynquery;
+ else
+ expr = ((PLpgSQL_var *) (estate->datums[((PLpgSQL_stmt_open *)stmt)->curvar]))->cursor_explicit_expr;
+ break;
+ default:
+ break;
}
+
+ if (expr)
+ 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)
- hint_query_string = NULL;
+ plpgsql_query_string = NULL;
}
#define standard_join_search pg_hint_plan_standard_join_search
#define make_join_rel pg_hint_plan_make_join_rel
#define add_paths_to_joinrel add_paths_to_joinrel_wrapper
#include "make_join_rel.c"
+
+#include "pg_stat_statements.c"
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