/*-------------------------------------------------------------------------
*
* pg_hint_plan.c
- * do instructions or hints to the planner using C-style block comments
- * of the SQL.
+ * hinting on how to execute a query for PostgreSQL
*
- * Copyright (c) 2012-2016, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2019, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
+#include <string.h>
+
#include "postgres.h"
+#include "access/genam.h"
+#include "access/heapam.h"
+#include "access/relation.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_index.h"
#include "commands/prepare.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
+#include "nodes/params.h"
+#include "optimizer/appendinfo.h"
#include "optimizer/clauses.h"
#include "optimizer/cost.h"
#include "optimizer/geqo.h"
#include "optimizer/joininfo.h"
+#include "optimizer/optimizer.h"
#include "optimizer/pathnode.h"
#include "optimizer/paths.h"
#include "optimizer/plancat.h"
#include "optimizer/planner.h"
#include "optimizer/prep.h"
#include "optimizer/restrictinfo.h"
+#include "parser/analyze.h"
+#include "parser/parsetree.h"
#include "parser/scansup.h"
+#include "partitioning/partbounds.h"
#include "tcop/utility.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/rel.h"
+#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "utils/resowner.h"
#define HINT_INDEXONLYSCAN "IndexOnlyScan"
#define HINT_INDEXONLYSCANREGEXP "IndexOnlyScanRegexp"
#define HINT_NOINDEXONLYSCAN "NoIndexOnlyScan"
+#define HINT_PARALLEL "Parallel"
+
#define HINT_NESTLOOP "NestLoop"
#define HINT_MERGEJOIN "MergeJoin"
#define HINT_HASHJOIN "HashJoin"
#define HINT_ARRAY_DEFAULT_INITSIZE 8
-#define hint_ereport(str, detail) \
- ereport(pg_hint_plan_message_level, \
- (errhidestmt(hidestmt), \
- errmsg("pg_hint_plan%s: hint syntax error at or near \"%s\"", qnostr, (str)), \
- errdetail detail))
+#define hint_ereport(str, detail) hint_parse_ereport(str, detail)
+#define hint_parse_ereport(str, detail) \
+ do { \
+ ereport(pg_hint_plan_parse_message_level, \
+ (errmsg("pg_hint_plan: hint syntax error at or near \"%s\"", (str)), \
+ errdetail detail)); \
+ } while(0)
#define skip_space(str) \
while (isspace(*str)) \
HINT_KEYWORD_INDEXONLYSCAN,
HINT_KEYWORD_INDEXONLYSCANREGEXP,
HINT_KEYWORD_NOINDEXONLYSCAN,
+
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_ROWS,
+ HINT_KEYWORD_PARALLEL,
+
HINT_KEYWORD_UNRECOGNIZED
} HintKeyword;
+#define SCAN_HINT_ACCEPTS_INDEX_NAMES(kw) \
+ (kw == HINT_KEYWORD_INDEXSCAN || \
+ kw == HINT_KEYWORD_INDEXSCANREGEXP || \
+ kw == HINT_KEYWORD_INDEXONLYSCAN || \
+ kw == HINT_KEYWORD_INDEXONLYSCANREGEXP || \
+ kw == HINT_KEYWORD_BITMAPSCAN || \
+ kw == HINT_KEYWORD_BITMAPSCANREGEXP)
+
+
typedef struct Hint Hint;
typedef struct HintState HintState;
Query *parse, const char *str);
/* hint types */
-#define NUM_HINT_TYPE 5
+#define NUM_HINT_TYPE 6
typedef enum HintType
{
HINT_TYPE_SCAN_METHOD,
HINT_TYPE_JOIN_METHOD,
HINT_TYPE_LEADING,
HINT_TYPE_SET,
- HINT_TYPE_ROWS
+ HINT_TYPE_ROWS,
+ HINT_TYPE_PARALLEL
} HintType;
+typedef enum HintTypeBitmap
+{
+ HINT_BM_SCAN_METHOD = 1,
+ HINT_BM_PARALLEL = 2
+} HintTypeBitmap;
+
static const char *HintTypeName[] = {
"scan method",
"join method",
"leading",
"set",
- "rows"
+ "rows",
+ "parallel"
};
/* hint status */
(hint)->base.state == HINT_STATE_USED)
static unsigned int qno = 0;
+static unsigned int msgqno = 0;
static char qnostr[32];
+static const char *current_hint_str = NULL;
+
+/*
+ * However we usually take a hint stirng in post_parse_analyze_hook, we still
+ * need to do so in planner_hook when client starts query execution from the
+ * bind message on a prepared query. This variable prevent duplicate and
+ * sometimes harmful hint string retrieval.
+ */
+static bool current_hint_retrieved = false;
/* common data for all hints. */
struct Hint
double rows;
} RowsHint;
+/* parallel hints */
+typedef struct ParallelHint
+{
+ Hint base;
+ char *relname;
+ char *nworkers_str; /* original string of nworkers */
+ int nworkers; /* num of workers specified by Worker */
+ bool force_parallel; /* force parallel scan */
+} ParallelHint;
+
/*
* Describes a context of hint processing.
*/
/* for scan method hints */
ScanMethodHint **scan_hints; /* parsed scan hints */
- int init_scan_mask; /* initial value of scan parameter */
+
+ /* Initial values of parameters */
+ int init_scan_mask; /* enable_* mask */
+ int init_nworkers; /* max_parallel_workers_per_gather */
+ /* min_parallel_table_scan_size*/
+ int init_min_para_tablescan_size;
+ /* min_parallel_index_scan_size*/
+ int init_min_para_indexscan_size;
+ int init_paratup_cost; /* parallel_tuple_cost */
+ int init_parasetup_cost;/* parallel_setup_cost */
+
+ PlannerInfo *current_root; /* PlannerInfo for the followings */
Index parent_relid; /* inherit parent of table relid */
- ScanMethodHint *parent_hint; /* inherit parent of table scan hint */
+ ScanMethodHint *parent_scan_hint; /* scan hint for the parent */
+ ParallelHint *parent_parallel_hint; /* parallel hint for the parent */
List *parent_index_infos; /* list of parent table's index */
- /* for join method hints */
JoinMethodHint **join_hints; /* parsed join hints */
int init_join_mask; /* initial value join parameter */
List **join_hint_level;
-
- /* for Leading hint */
LeadingHint **leading_hint; /* parsed Leading 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 */
+ ParallelHint **parallel_hints; /* parsed Parallel hints */
};
/*
static void push_hint(HintState *hstate);
static void pop_hint(void);
-static void pg_hint_plan_ProcessUtility(Node *parsetree,
- const char *queryString,
- ProcessUtilityContext context,
- ParamListInfo params,
- DestReceiver *dest, char *completionTag);
+static void pg_hint_plan_post_parse_analyze(ParseState *pstate, Query *query);
+static void pg_hint_plan_ProcessUtility(PlannedStmt *pstmt,
+ const char *queryString,
+ ProcessUtilityContext context,
+ ParamListInfo params, QueryEnvironment *queryEnv,
+ DestReceiver *dest, char *completionTag);
static PlannedStmt *pg_hint_plan_planner(Query *parse, int cursorOptions,
ParamListInfo boundParams);
-static void pg_hint_plan_get_relation_info(PlannerInfo *root,
- Oid relationObjectId,
- bool inhparent, RelOptInfo *rel);
static RelOptInfo *pg_hint_plan_join_search(PlannerInfo *root,
int levels_needed,
List *initial_rels);
static const char *RowsHintParse(RowsHint *hint, HintState *hstate,
Query *parse, const char *str);
+/* Parallel hint callbacks */
+static Hint *ParallelHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword);
+static void ParallelHintDelete(ParallelHint *hint);
+static void ParallelHintDesc(ParallelHint *hint, StringInfo buf, bool nolf);
+static int ParallelHintCmp(const ParallelHint *a, const ParallelHint *b);
+static const char *ParallelHintParse(ParallelHint *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,
int levels_needed,
List *initial_rels);
void pg_hint_plan_join_search_one_level(PlannerInfo *root, int level);
+void pg_hint_plan_set_rel_pathlist(PlannerInfo * root, RelOptInfo *rel,
+ Index rti, RangeTblEntry *rte);
+static void create_plain_partial_paths(PlannerInfo *root,
+ RelOptInfo *rel);
static void make_rels_by_clause_joins(PlannerInfo *root, RelOptInfo *old_rel,
ListCell *other_rels);
static void make_rels_by_clauseless_joins(PlannerInfo *root,
RelOptInfo *old_rel,
ListCell *other_rels);
static bool has_join_restriction(PlannerInfo *root, RelOptInfo *rel);
+static void set_plain_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
+ RangeTblEntry *rte);
static void set_append_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
Index rti, RangeTblEntry *rte);
-static void generate_mergeappend_paths(PlannerInfo *root, RelOptInfo *rel,
- List *live_childrels,
- List *all_child_pathkeys);
-static Path *get_cheapest_parameterized_child_path(PlannerInfo *root,
- RelOptInfo *rel,
- Relids required_outer);
-static List *accumulate_append_subpath(List *subpaths, Path *path);
RelOptInfo *pg_hint_plan_make_join_rel(PlannerInfo *root, RelOptInfo *rel1,
RelOptInfo *rel2);
bool isCommit,
bool isTopLevel,
void *arg);
+static int set_config_option_noerror(const char *name, const char *value,
+ GucContext context, GucSource source,
+ GucAction action, bool changeVal, int elevel);
+static void setup_scan_method_enforcement(ScanMethodHint *scanhint,
+ HintState *state);
+static int set_config_int32_option(const char *name, int32 value,
+ GucContext context);
/* GUC variables */
static bool pg_hint_plan_enable_hint = true;
static int debug_level = 0;
-static int pg_hint_plan_message_level = INFO;
+static int pg_hint_plan_parse_message_level = INFO;
+static int pg_hint_plan_debug_message_level = LOG;
/* Default is off, to keep backward compatibility. */
static bool pg_hint_plan_enable_hint_table = false;
-/* Internal static variables. */
-static bool hidestmt = false; /* Allow or inhibit STATEMENT: output */
-
static int plpgsql_recurse_level = 0; /* PLpgSQL recursion level */
+static int recurse_level = 0; /* recursion level incl. direct SPI calls */
static int hint_inhibit_level = 0; /* Inhibit hinting if this is above 0 */
/* (This could not be above 1) */
+static int max_hint_nworkers = -1; /* Maximum nworkers of Workers hints */
static const struct config_enum_entry parse_messages_level_options[] = {
{"debug", DEBUG2, true},
};
/* Saved hook values in case of unload */
-static ProcessUtility_hook_type prev_ProcessUtility = NULL;
+static post_parse_analyze_hook_type prev_post_parse_analyze_hook = NULL;
static planner_hook_type prev_planner = NULL;
-static get_relation_info_hook_type prev_get_relation_info = NULL;
static join_search_hook_type prev_join_search = NULL;
+static set_rel_pathlist_hook_type prev_set_rel_pathlist = NULL;
+static ProcessUtility_hook_type prev_ProcessUtility_hook = NULL;
/* Hold reference to currently active hint */
static HintState *current_hint_state = NULL;
*/
static List *HintStateStack = NIL;
-/*
- * Holds statement name during executing EXECUTE command. NULL for other
- * statements.
- */
-static char *stmt_name = NULL;
-
static const HintParser parsers[] = {
{HINT_SEQSCAN, ScanMethodHintCreate, HINT_KEYWORD_SEQSCAN},
{HINT_INDEXSCAN, ScanMethodHintCreate, HINT_KEYWORD_INDEXSCAN},
{HINT_INDEXONLYSCANREGEXP, ScanMethodHintCreate,
HINT_KEYWORD_INDEXONLYSCANREGEXP},
{HINT_NOINDEXONLYSCAN, ScanMethodHintCreate, HINT_KEYWORD_NOINDEXONLYSCAN},
+
{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},
{HINT_ROWS, RowsHintCreate, HINT_KEYWORD_ROWS},
+ {HINT_PARALLEL, ParallelHintCreate, HINT_KEYWORD_PARALLEL},
+
{NULL, NULL, HINT_KEYWORD_UNRECOGNIZED}
};
DefineCustomEnumVariable("pg_hint_plan.parse_messages",
"Message level of parse errors.",
NULL,
- &pg_hint_plan_message_level,
+ &pg_hint_plan_parse_message_level,
INFO,
parse_messages_level_options,
PGC_USERSET,
DefineCustomEnumVariable("pg_hint_plan.message_level",
"Message level of debug messages.",
NULL,
- &pg_hint_plan_message_level,
- INFO,
+ &pg_hint_plan_debug_message_level,
+ LOG,
parse_messages_level_options,
PGC_USERSET,
0,
NULL);
DefineCustomBoolVariable("pg_hint_plan.enable_hint_table",
- "Force planner to not get hint by using table lookups.",
+ "Let pg_hint_plan look up the hint table.",
NULL,
&pg_hint_plan_enable_hint_table,
false,
NULL);
/* Install hooks. */
- prev_ProcessUtility = ProcessUtility_hook;
- ProcessUtility_hook = pg_hint_plan_ProcessUtility;
+ prev_post_parse_analyze_hook = post_parse_analyze_hook;
+ post_parse_analyze_hook = pg_hint_plan_post_parse_analyze;
prev_planner = planner_hook;
planner_hook = pg_hint_plan_planner;
- prev_get_relation_info = get_relation_info_hook;
- get_relation_info_hook = pg_hint_plan_get_relation_info;
prev_join_search = join_search_hook;
join_search_hook = pg_hint_plan_join_search;
+ prev_set_rel_pathlist = set_rel_pathlist_hook;
+ set_rel_pathlist_hook = pg_hint_plan_set_rel_pathlist;
+ prev_ProcessUtility_hook = ProcessUtility_hook;
+ ProcessUtility_hook = pg_hint_plan_ProcessUtility;
/* setup PL/pgSQL plugin hook */
var_ptr = (PLpgSQL_plugin **) find_rendezvous_variable("PLpgSQL_plugin");
PLpgSQL_plugin **var_ptr;
/* Uninstall hooks. */
- ProcessUtility_hook = prev_ProcessUtility;
+ post_parse_analyze_hook = prev_post_parse_analyze_hook;
planner_hook = prev_planner;
- get_relation_info_hook = prev_get_relation_info;
join_search_hook = prev_join_search;
+ set_rel_pathlist_hook = prev_set_rel_pathlist;
+ ProcessUtility_hook = prev_ProcessUtility_hook;
/* uninstall PL/pgSQL plugin hook */
var_ptr = (PLpgSQL_plugin **) find_rendezvous_variable("PLpgSQL_plugin");
pfree(hint);
}
+static Hint *
+ParallelHintCreate(const char *hint_str, const char *keyword,
+ HintKeyword hint_keyword)
+{
+ ParallelHint *hint;
+
+ hint = palloc(sizeof(ParallelHint));
+ hint->base.hint_str = hint_str;
+ hint->base.keyword = keyword;
+ hint->base.hint_keyword = hint_keyword;
+ hint->base.type = HINT_TYPE_PARALLEL;
+ hint->base.state = HINT_STATE_NOTUSED;
+ hint->base.delete_func = (HintDeleteFunction) ParallelHintDelete;
+ hint->base.desc_func = (HintDescFunction) ParallelHintDesc;
+ hint->base.cmp_func = (HintCmpFunction) ParallelHintCmp;
+ hint->base.parse_func = (HintParseFunction) ParallelHintParse;
+ hint->relname = NULL;
+ hint->nworkers = 0;
+ hint->nworkers_str = "0";
+
+ return (Hint *) hint;
+}
+
+static void
+ParallelHintDelete(ParallelHint *hint)
+{
+ if (!hint)
+ return;
+
+ if (hint->relname)
+ pfree(hint->relname);
+ pfree(hint);
+}
+
+
static HintState *
HintStateCreate(void)
{
memset(hstate->num_hints, 0, sizeof(hstate->num_hints));
hstate->scan_hints = NULL;
hstate->init_scan_mask = 0;
+ hstate->init_nworkers = 0;
+ hstate->init_min_para_tablescan_size = 0;
+ hstate->init_min_para_indexscan_size = 0;
+ hstate->init_paratup_cost = 0;
+ hstate->init_parasetup_cost = 0;
+ hstate->current_root = NULL;
hstate->parent_relid = 0;
- hstate->parent_hint = NULL;
+ hstate->parent_scan_hint = NULL;
+ hstate->parent_parallel_hint = NULL;
hstate->parent_index_infos = NIL;
hstate->join_hints = NULL;
hstate->init_join_mask = 0;
hstate->context = superuser() ? PGC_SUSET : PGC_USERSET;
hstate->set_hints = NULL;
hstate->rows_hints = NULL;
+ hstate->parallel_hints = NULL;
return hstate;
}
appendStringInfoChar(buf, '\n');
}
+static void
+ParallelHintDesc(ParallelHint *hint, StringInfo buf, bool nolf)
+{
+ appendStringInfo(buf, "%s(", hint->base.keyword);
+ if (hint->relname != NULL)
+ {
+ quote_value(buf, hint->relname);
+
+ /* number of workers */
+ appendStringInfoCharMacro(buf, ' ');
+ quote_value(buf, hint->nworkers_str);
+ /* application mode of num of workers */
+ appendStringInfoCharMacro(buf, ' ');
+ appendStringInfoString(buf,
+ (hint->force_parallel ? "hard" : "soft"));
+ }
+ appendStringInfoString(buf, ")");
+ if (!nolf)
+ appendStringInfoChar(buf, '\n');
+}
+
/*
* Append string which represents all hints in a given state to buf, with
* preceding title with them.
if (!hstate)
{
- elog(LOG, "pg_hint_plan:\nno hint");
+ elog(pg_hint_plan_debug_message_level, "pg_hint_plan:\nno hint");
return;
}
desc_hint_in_state(hstate, &buf, "duplication hint", HINT_STATE_DUPLICATION, false);
desc_hint_in_state(hstate, &buf, "error hint", HINT_STATE_ERROR, false);
- elog(LOG, "%s", buf.data);
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg ("%s", buf.data)));
pfree(buf.data);
}
if (!hstate)
{
- elog(pg_hint_plan_message_level,
+ elog(pg_hint_plan_debug_message_level,
"pg_hint_plan%s: HintStateDump: no hint", qnostr);
return;
}
desc_hint_in_state(hstate, &buf, "}, {error hints", HINT_STATE_ERROR, true);
appendStringInfoChar(&buf, '}');
- ereport(pg_hint_plan_message_level,
- (errhidestmt(true),
- errmsg("%s", buf.data)));
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg("%s", buf.data),
+ errhidestmt(true),
+ errhidecontext(true)));
pfree(buf.data);
}
}
static int
+ParallelHintCmp(const ParallelHint *a, const ParallelHint *b)
+{
+ return RelnameCmp(&a->relname, &b->relname);
+}
+
+static int
HintCmp(const void *a, const void *b)
{
const Hint *hinta = *((const Hint **) a);
char *keyword = parser->keyword;
Hint *hint;
- if (strcasecmp(buf.data, keyword) != 0)
+ if (pg_strcasecmp(buf.data, keyword) != 0)
continue;
hint = parser->create_func(head, keyword, parser->hint_keyword);
char *hints = NULL;
Oid argtypes[2] = { TEXTOID, TEXTOID };
Datum values[2];
- bool nulls[2] = { false, false };
+ char nulls[2] = {' ', ' '};
text *qry;
text *app;
PG_TRY();
{
+ bool snapshot_set = false;
+
hint_inhibit_level++;
+
+ if (!ActiveSnapshotSet())
+ {
+ PushActiveSnapshot(GetTransactionSnapshot());
+ snapshot_set = true;
+ }
SPI_connect();
}
SPI_finish();
-
+
+ if (snapshot_set)
+ PopActiveSnapshot();
+
hint_inhibit_level--;
}
PG_CATCH();
}
/*
- * Get client-supplied query string.
+ * Get client-supplied query string. Addtion to that the jumbled query is
+ * supplied if the caller requested. From the restriction of JumbleQuery, some
+ * kind of query needs special amendments. Reutrns NULL if this query doesn't
+ * change the current hint. This function returns NULL also when something
+ * wrong has happend and let the caller continue using the current hints.
*/
static const char *
-get_query_string(void)
+get_query_string(ParseState *pstate, Query *query, Query **jumblequery)
{
- const char *p;
+ const char *p = debug_query_string;
- if (plpgsql_recurse_level > 0)
+ /*
+ * If debug_query_string is set, it is the top level statement. But in some
+ * cases we reach here with debug_query_string set NULL for example in the
+ * case of DESCRIBE message handling or EXECUTE command. We may still see a
+ * candidate top-level query in pstate in the case.
+ */
+ if (!p && pstate)
+ p = pstate->p_sourcetext;
+
+ /* We don't see a query string, return NULL */
+ if (!p)
+ return NULL;
+
+ if (jumblequery != NULL)
+ *jumblequery = query;
+
+ if (query->commandType == CMD_UTILITY)
{
+ Query *target_query = (Query *)query->utilityStmt;
+
/*
- * This is quite ugly but this is the only point I could find where
- * we can get the query string.
+ * Some CMD_UTILITY statements have a subquery that we can hint on.
+ * Since EXPLAIN can be placed before other kind of utility statements
+ * and EXECUTE can be contained other kind of utility statements, these
+ * conditions are not mutually exclusive and should be considered in
+ * this order.
*/
- p = (char*)error_context_stack->arg;
- }
- else if (stmt_name)
- {
- PreparedStatement *entry;
+ if (IsA(target_query, ExplainStmt))
+ {
+ ExplainStmt *stmt = (ExplainStmt *)target_query;
+
+ Assert(IsA(stmt->query, Query));
+ target_query = (Query *)stmt->query;
+
+ /* strip out the top-level query for further processing */
+ if (target_query->commandType == CMD_UTILITY &&
+ target_query->utilityStmt != NULL)
+ target_query = (Query *)target_query->utilityStmt;
+ }
- entry = FetchPreparedStatement(stmt_name, true);
- p = entry->plansource->query_string;
+ if (IsA(target_query, DeclareCursorStmt))
+ {
+ DeclareCursorStmt *stmt = (DeclareCursorStmt *)target_query;
+ Query *query = (Query *)stmt->query;
+
+ /* the target must be CMD_SELECT in this case */
+ Assert(IsA(query, Query) && query->commandType == CMD_SELECT);
+ target_query = query;
+ }
+
+ if (IsA(target_query, CreateTableAsStmt))
+ {
+ CreateTableAsStmt *stmt = (CreateTableAsStmt *) target_query;
+
+ Assert(IsA(stmt->query, Query));
+ target_query = (Query *) stmt->query;
+
+ /* strip out the top-level query for further processing */
+ if (target_query->commandType == CMD_UTILITY &&
+ target_query->utilityStmt != NULL)
+ target_query = (Query *)target_query->utilityStmt;
+ }
+
+ if (IsA(target_query, ExecuteStmt))
+ {
+ /*
+ * Use the prepared query for EXECUTE. The Query for jumble
+ * also replaced with the corresponding one.
+ */
+ ExecuteStmt *stmt = (ExecuteStmt *)target_query;
+ PreparedStatement *entry;
+
+ entry = FetchPreparedStatement(stmt->name, true);
+ p = entry->plansource->query_string;
+ target_query = (Query *) linitial (entry->plansource->query_list);
+ }
+
+ /* JumbleQuery accespts only a non-utility Query */
+ if (!IsA(target_query, Query) ||
+ target_query->utilityStmt != NULL)
+ target_query = NULL;
+
+ if (jumblequery)
+ *jumblequery = target_query;
}
- else
- p = debug_query_string;
+ /*
+ * Return NULL if pstate is not of top-level query. We don't need this
+ * when jumble info is not requested or cannot do this when pstate is NULL.
+ */
+ else if (!jumblequery && pstate && pstate->p_sourcetext != p &&
+ strcmp(pstate->p_sourcetext, p) != 0)
+ p = NULL;
return p;
}
if (hints == NULL)
return NULL;
+ /* -1 means that no Parallel hint is specified. */
+ max_hint_nworkers = -1;
+
p = hints;
hstate = HintStateCreate();
hstate->hint_str = (char *) hints;
hstate->num_hints[HINT_TYPE_LEADING]);
hstate->rows_hints = (RowsHint **) (hstate->set_hints +
hstate->num_hints[HINT_TYPE_SET]);
+ hstate->parallel_hints = (ParallelHint **) (hstate->set_hints +
+ hstate->num_hints[HINT_TYPE_ROWS]);
return hstate;
}
/* Parse relation name and index name(s) if given hint accepts. */
length = list_length(name_list);
- if (length > 0)
+
+ /* at least twp parameters required */
+ if (length < 1)
{
- 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 &&
- hint_keyword != HINT_KEYWORD_INDEXONLYSCAN &&
- hint_keyword != HINT_KEYWORD_INDEXONLYSCANREGEXP &&
- hint_keyword != HINT_KEYWORD_BITMAPSCAN &&
- hint_keyword != HINT_KEYWORD_BITMAPSCANREGEXP)
- {
- hint_ereport(str,
- ("%s hint accepts only one relation.",
- hint->base.keyword));
- hint->base.state = HINT_STATE_ERROR;
- return str;
- }
+ hint_ereport(str,
+ ("%s hint requires a relation.", hint->base.keyword));
+ hint->base.state = HINT_STATE_ERROR;
+ return str;
}
- else
+
+ hint->relname = linitial(name_list);
+ hint->indexnames = list_delete_first(name_list);
+
+ /* check whether the hint accepts index name(s) */
+ if (length > 1 && !SCAN_HINT_ACCEPTS_INDEX_NAMES(hint_keyword))
{
hint_ereport(str,
- ("%s hint requires a relation.",
+ ("%s hint accepts only one relation.",
hint->base.keyword));
hint->base.state = HINT_STATE_ERROR;
return str;
return str;
}
+static const char *
+ParallelHintParse(ParallelHint *hint, HintState *hstate, Query *parse,
+ const char *str)
+{
+ HintKeyword hint_keyword = hint->base.hint_keyword;
+ List *name_list = NIL;
+ int length;
+ char *end_ptr;
+ int nworkers;
+ bool force_parallel = false;
+
+ if ((str = parse_parentheses(str, &name_list, hint_keyword)) == NULL)
+ return NULL;
+
+ /* Parse relation name and index name(s) if given hint accepts. */
+ length = list_length(name_list);
+
+ if (length < 2 || length > 3)
+ {
+ hint_ereport(")",
+ ("wrong number of arguments (%d): %s",
+ length, hint->base.keyword));
+ hint->base.state = HINT_STATE_ERROR;
+ return str;
+ }
+
+ hint->relname = linitial(name_list);
+
+ /* The second parameter is number of workers */
+ hint->nworkers_str = list_nth(name_list, 1);
+ nworkers = strtod(hint->nworkers_str, &end_ptr);
+ if (*end_ptr || nworkers < 0 || nworkers > max_worker_processes)
+ {
+ if (*end_ptr)
+ hint_ereport(hint->nworkers_str,
+ ("number of workers must be a number: %s",
+ hint->base.keyword));
+ else if (nworkers < 0)
+ hint_ereport(hint->nworkers_str,
+ ("number of workers must be positive: %s",
+ hint->base.keyword));
+ else if (nworkers > max_worker_processes)
+ hint_ereport(hint->nworkers_str,
+ ("number of workers = %d is larger than max_worker_processes(%d): %s",
+ nworkers, max_worker_processes, hint->base.keyword));
+
+ hint->base.state = HINT_STATE_ERROR;
+ }
+
+ hint->nworkers = nworkers;
+
+ /* optional third parameter is specified */
+ if (length == 3)
+ {
+ const char *modeparam = (const char *)list_nth(name_list, 2);
+ if (pg_strcasecmp(modeparam, "hard") == 0)
+ force_parallel = true;
+ else if (pg_strcasecmp(modeparam, "soft") != 0)
+ {
+ hint_ereport(modeparam,
+ ("enforcement must be soft or hard: %s",
+ hint->base.keyword));
+ hint->base.state = HINT_STATE_ERROR;
+ }
+ }
+
+ hint->force_parallel = force_parallel;
+
+ if (hint->base.state != HINT_STATE_ERROR &&
+ nworkers > max_hint_nworkers)
+ max_hint_nworkers = nworkers;
+
+ return str;
+}
+
/*
* set GUC parameter functions
*/
static int
-set_config_option_wrapper(const char *name, const char *value,
+get_current_scan_mask()
+{
+ int mask = 0;
+
+ if (enable_seqscan)
+ mask |= ENABLE_SEQSCAN;
+ if (enable_indexscan)
+ mask |= ENABLE_INDEXSCAN;
+ if (enable_bitmapscan)
+ mask |= ENABLE_BITMAPSCAN;
+ if (enable_tidscan)
+ mask |= ENABLE_TIDSCAN;
+ if (enable_indexonlyscan)
+ mask |= ENABLE_INDEXONLYSCAN;
+
+ return mask;
+}
+
+static int
+get_current_join_mask()
+{
+ int mask = 0;
+
+ if (enable_nestloop)
+ mask |= ENABLE_NESTLOOP;
+ if (enable_mergejoin)
+ mask |= ENABLE_MERGEJOIN;
+ if (enable_hashjoin)
+ mask |= ENABLE_HASHJOIN;
+
+ return mask;
+}
+
+/*
+ * Sets GUC prameters without throwing exception. Reutrns false if something
+ * wrong.
+ */
+static int
+set_config_option_noerror(const char *name, const char *value,
GucContext context, GucSource source,
GucAction action, bool changeVal, int elevel)
{
ereport(elevel,
(errcode(errdata->sqlerrcode),
- errhidestmt(hidestmt),
errmsg("%s", errdata->message),
errdata->detail ? errdetail("%s", errdata->detail) : 0,
errdata->hint ? errhint("%s", errdata->hint) : 0));
+ msgqno = qno;
FreeErrorData(errdata);
}
PG_END_TRY();
return result;
}
+/*
+ * Sets GUC parameter of int32 type without throwing exceptions. Returns false
+ * if something wrong.
+ */
static int
-set_config_options(SetHint **options, int noptions, GucContext context)
+set_config_int32_option(const char *name, int32 value, GucContext context)
{
- int i;
- int save_nestlevel;
+ char buf[16]; /* enough for int32 */
- save_nestlevel = NewGUCNestLevel();
+ if (snprintf(buf, 16, "%d", value) < 0)
+ {
+ ereport(pg_hint_plan_parse_message_level,
+ (errmsg ("Failed to convert integer to string: %d", value)));
+ return false;
+ }
+
+ return
+ set_config_option_noerror(name, buf, context,
+ PGC_S_SESSION, GUC_ACTION_SAVE, true,
+ pg_hint_plan_parse_message_level);
+}
+
+/* setup scan method enforcement according to given options */
+static void
+setup_guc_enforcement(SetHint **options, int noptions, GucContext context)
+{
+ int i;
for (i = 0; i < noptions; i++)
{
if (!hint_state_enabled(hint))
continue;
- result = set_config_option_wrapper(hint->name, hint->value, context,
+ result = set_config_option_noerror(hint->name, hint->value, context,
PGC_S_SESSION, GUC_ACTION_SAVE, true,
- pg_hint_plan_message_level);
+ pg_hint_plan_parse_message_level);
if (result != 0)
hint->base.state = HINT_STATE_USED;
else
hint->base.state = HINT_STATE_ERROR;
}
- return save_nestlevel;
+ return;
+}
+
+/*
+ * Setup parallel execution environment.
+ *
+ * If hint is not NULL, set up using it, elsewise reset to initial environment.
+ */
+static void
+setup_parallel_plan_enforcement(ParallelHint *hint, HintState *state)
+{
+ if (hint)
+ {
+ hint->base.state = HINT_STATE_USED;
+ set_config_int32_option("max_parallel_workers_per_gather",
+ hint->nworkers, state->context);
+ }
+ else
+ set_config_int32_option("max_parallel_workers_per_gather",
+ state->init_nworkers, state->context);
+
+ /* force means that enforce parallel as far as possible */
+ if (hint && hint->force_parallel && hint->nworkers > 0)
+ {
+ set_config_int32_option("parallel_tuple_cost", 0, state->context);
+ set_config_int32_option("parallel_setup_cost", 0, state->context);
+ set_config_int32_option("min_parallel_table_scan_size", 0,
+ state->context);
+ set_config_int32_option("min_parallel_index_scan_size", 0,
+ state->context);
+ }
+ else
+ {
+ set_config_int32_option("parallel_tuple_cost",
+ state->init_paratup_cost, state->context);
+ set_config_int32_option("parallel_setup_cost",
+ state->init_parasetup_cost, state->context);
+ set_config_int32_option("min_parallel_table_scan_size",
+ state->init_min_para_tablescan_size,
+ state->context);
+ set_config_int32_option("min_parallel_index_scan_size",
+ state->init_min_para_indexscan_size,
+ state->context);
+ }
}
#define SET_CONFIG_OPTION(name, type_bits) \
- set_config_option_wrapper((name), \
+ set_config_option_noerror((name), \
(mask & (type_bits)) ? "true" : "false", \
context, PGC_S_SESSION, GUC_ACTION_SAVE, true, ERROR)
+
+/*
+ * Setup GUC environment to enforce scan methods. If scanhint is NULL, reset
+ * GUCs to the saved state in state.
+ */
static void
-set_scan_config_options(unsigned char enforce_mask, GucContext context)
+setup_scan_method_enforcement(ScanMethodHint *scanhint, HintState *state)
{
+ unsigned char enforce_mask = state->init_scan_mask;
+ GucContext context = state->context;
unsigned char mask;
+ if (scanhint)
+ {
+ enforce_mask = scanhint->enforce_mask;
+ scanhint->base.state = HINT_STATE_USED;
+ }
+
if (enforce_mask == ENABLE_SEQSCAN || enforce_mask == ENABLE_INDEXSCAN ||
enforce_mask == ENABLE_BITMAPSCAN || enforce_mask == ENABLE_TIDSCAN
|| enforce_mask == (ENABLE_INDEXSCAN | ENABLE_INDEXONLYSCAN)
}
/*
- * pg_hint_plan hook functions
+ * Push a hint into hint stack which is implemented with List struct. Head of
+ * list is top of stack.
*/
-
static void
-pg_hint_plan_ProcessUtility(Node *parsetree, const char *queryString,
- ProcessUtilityContext context,
- ParamListInfo params,
- DestReceiver *dest, char *completionTag)
+push_hint(HintState *hstate)
{
- Node *node;
-
- /*
- * 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 || hint_inhibit_level > 0)
- {
- if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
- (errmsg ("pg_hint_plan: ProcessUtility:"
- " pg_hint_plan.enable_hint = off")));
- if (prev_ProcessUtility)
- (*prev_ProcessUtility) (parsetree, queryString,
- context, params,
- dest, completionTag);
- else
- standard_ProcessUtility(parsetree, queryString,
- context, params,
- dest, completionTag);
- return;
- }
-
- node = parsetree;
- if (IsA(node, ExplainStmt))
- {
- /*
- * Draw out parse tree of actual query from Query struct of EXPLAIN
- * statement.
- */
- ExplainStmt *stmt;
- Query *query;
-
- stmt = (ExplainStmt *) node;
+ /* Prepend new hint to the list means pushing to stack. */
+ HintStateStack = lcons(hstate, HintStateStack);
- Assert(IsA(stmt->query, Query));
- query = (Query *) stmt->query;
+ /* Pushed hint is the one which should be used hereafter. */
+ current_hint_state = hstate;
+}
- if (query->commandType == CMD_UTILITY && query->utilityStmt != NULL)
- node = query->utilityStmt;
- }
+/* Pop a hint from hint stack. Popped hint is automatically discarded. */
+static void
+pop_hint(void)
+{
+ /* Hint stack must not be empty. */
+ if(HintStateStack == NIL)
+ elog(ERROR, "hint stack is empty");
/*
- * 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.
+ * Take a hint at the head from the list, and free it. Switch
+ * current_hint_state to point new head (NULL if the list is empty).
*/
- if (IsA(node, ExecuteStmt))
- {
- ExecuteStmt *stmt;
+ HintStateStack = list_delete_first(HintStateStack);
+ HintStateDelete(current_hint_state);
+ if(HintStateStack == NIL)
+ current_hint_state = NULL;
+ else
+ current_hint_state = (HintState *) lfirst(list_head(HintStateStack));
+}
- stmt = (ExecuteStmt *) node;
- stmt_name = stmt->name;
- }
+/*
+ * Retrieve and store hint string from given query or from the hint table.
+ */
+static void
+get_current_hint_string(ParseState *pstate, Query *query)
+{
+ const char *query_str;
+ MemoryContext oldcontext;
- /*
- * CREATE AS EXECUTE behavior has changed since 9.2, so we must handle it
- * specially here.
- */
- if (IsA(node, CreateTableAsStmt))
- {
- CreateTableAsStmt *stmt;
- Query *query;
+ /* do nothing under hint table search */
+ if (hint_inhibit_level > 0)
+ return;
+
+ /* We alredy have one, don't parse it again. */
+ if (current_hint_retrieved)
+ return;
- stmt = (CreateTableAsStmt *) node;
- Assert(IsA(stmt->query, Query));
- query = (Query *) stmt->query;
+ /* Don't parse the current query hereafter */
+ current_hint_retrieved = true;
- if (query->commandType == CMD_UTILITY &&
- IsA(query->utilityStmt, ExecuteStmt))
+ if (!pg_hint_plan_enable_hint)
+ {
+ if (current_hint_str)
{
- ExecuteStmt *estmt = (ExecuteStmt *) query->utilityStmt;
- stmt_name = estmt->name;
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
}
+ return;
}
- if (stmt_name)
+ /* increment the query number */
+ qnostr[0] = 0;
+ if (debug_level > 1)
+ snprintf(qnostr, sizeof(qnostr), "[qno=0x%x]", qno++);
+ qno++;
+
+ /* search the hint table for a hint if requested */
+ if (pg_hint_plan_enable_hint_table)
{
- if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
- (errmsg ("pg_hint_plan: ProcessUtility:"
- " stmt_name = \"%s\", statement=\"%s\"",
- stmt_name, queryString)));
+ int query_len;
+ pgssJumbleState jstate;
+ Query *jumblequery;
+ char *normalized_query = NULL;
+
+ query_str = get_query_string(pstate, query, &jumblequery);
+
+ /* If this query is not for hint, just return */
+ if (!query_str)
+ return;
- PG_TRY();
+ /* clear the previous hint string */
+ if (current_hint_str)
{
- if (prev_ProcessUtility)
- (*prev_ProcessUtility) (parsetree, queryString,
- context, params,
- dest, completionTag);
- else
- standard_ProcessUtility(parsetree, queryString,
- context, params,
- dest, completionTag);
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
}
- PG_CATCH();
+
+ if (jumblequery)
{
- stmt_name = NULL;
- PG_RE_THROW();
+ /*
+ * XXX: normalization code is copied from pg_stat_statements.c.
+ * Make sure to keep up-to-date with it.
+ */
+ 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, jumblequery);
+
+ /*
+ * Normalize the query string by replacing constants with '?'
+ */
+ /*
+ * Search hint string which is stored keyed by query string
+ * and application name. The query string is normalized to allow
+ * fuzzy matching.
+ *
+ * Adding 1 byte to query_len ensures that the returned string has
+ * a terminating NULL.
+ */
+ query_len = strlen(query_str) + 1;
+ normalized_query =
+ generate_normalized_query(&jstate, query_str,
+ query->stmt_location,
+ &query_len,
+ GetDatabaseEncoding());
+
+ /*
+ * find a hint for the normalized query. the result should be in
+ * TopMemoryContext
+ */
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+ current_hint_str =
+ get_hints_from_table(normalized_query, application_name);
+ MemoryContextSwitchTo(oldcontext);
+
+ if (debug_level > 1)
+ {
+ if (current_hint_str)
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg("pg_hint_plan[qno=0x%x]: "
+ "post_parse_analyze_hook: "
+ "hints from table: \"%s\": "
+ "normalized_query=\"%s\", "
+ "application name =\"%s\"",
+ qno, current_hint_str,
+ normalized_query, application_name),
+ errhidestmt(msgqno != qno),
+ errhidecontext(msgqno != qno)));
+ else
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg("pg_hint_plan[qno=0x%x]: "
+ "no match found in table: "
+ "application name = \"%s\", "
+ "normalized_query=\"%s\"",
+ qno, application_name,
+ normalized_query),
+ errhidestmt(msgqno != qno),
+ errhidecontext(msgqno != qno)));
+
+ msgqno = qno;
+ }
}
- PG_END_TRY();
- stmt_name = NULL;
+ /* retrun if we have hint here */
+ if (current_hint_str)
+ return;
+ }
+ else
+ query_str = get_query_string(pstate, query, NULL);
- return;
+ if (query_str)
+ {
+ /*
+ * get hints from the comment. However we may have the same query
+ * string with the previous call, but the extra comparison seems no
+ * use..
+ */
+ if (current_hint_str)
+ pfree((void *)current_hint_str);
+
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+ current_hint_str = get_hints_from_comment(query_str);
+ MemoryContextSwitchTo(oldcontext);
}
- if (prev_ProcessUtility)
- (*prev_ProcessUtility) (parsetree, queryString,
- context, params,
- dest, completionTag);
+ if (debug_level > 1)
+ {
+ if (debug_level == 1 && query_str && debug_query_string &&
+ strcmp(query_str, debug_query_string))
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg("hints in comment=\"%s\"",
+ current_hint_str ? current_hint_str : "(none)"),
+ errhidestmt(msgqno != qno),
+ errhidecontext(msgqno != qno)));
else
- standard_ProcessUtility(parsetree, queryString,
- context, params,
- dest, completionTag);
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg("hints in comment=\"%s\", query=\"%s\", debug_query_string=\"%s\"",
+ current_hint_str ? current_hint_str : "(none)",
+ query_str ? query_str : "(none)",
+ debug_query_string ? debug_query_string : "(none)"),
+ errhidestmt(msgqno != qno),
+ errhidecontext(msgqno != qno)));
+ msgqno = qno;
+ }
}
/*
- * Push a hint into hint stack which is implemented with List struct. Head of
- * list is top of stack.
+ * Retrieve hint string from the current query.
*/
static void
-push_hint(HintState *hstate)
+pg_hint_plan_post_parse_analyze(ParseState *pstate, Query *query)
{
- /* Prepend new hint to the list means pushing to stack. */
- HintStateStack = lcons(hstate, HintStateStack);
+ if (prev_post_parse_analyze_hook)
+ prev_post_parse_analyze_hook(pstate, query);
- /* Pushed hint is the one which should be used hereafter. */
- current_hint_state = hstate;
+ /* always retrieve hint from the top-level query string */
+ if (plpgsql_recurse_level == 0)
+ current_hint_retrieved = false;
+
+ get_current_hint_string(pstate, query);
}
-/* Pop a hint from hint stack. Popped hint is automatically discarded. */
+/*
+ * We need to reset current_hint_retrieved flag always when a command execution
+ * is finished. This is true even for a pure utility command that doesn't
+ * involve planning phase.
+ */
static void
-pop_hint(void)
+pg_hint_plan_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
+ ProcessUtilityContext context,
+ ParamListInfo params, QueryEnvironment *queryEnv,
+ DestReceiver *dest, char *completionTag)
{
- /* Hint stack must not be empty. */
- if(HintStateStack == NIL)
- elog(ERROR, "hint stack is empty");
-
- /*
- * Take a hint at the head from the list, and free it. Switch
- * current_hint_state to point new head (NULL if the list is empty).
- */
- HintStateStack = list_delete_first(HintStateStack);
- HintStateDelete(current_hint_state);
- if(HintStateStack == NIL)
- current_hint_state = NULL;
+ if (prev_ProcessUtility_hook)
+ prev_ProcessUtility_hook(pstmt, queryString, context, params, queryEnv,
+ dest, completionTag);
else
- current_hint_state = (HintState *) lfirst(list_head(HintStateStack));
+ standard_ProcessUtility(pstmt, queryString, context, params, queryEnv,
+ dest, completionTag);
+
+ if (plpgsql_recurse_level == 0)
+ current_hint_retrieved = false;
}
+/*
+ * Read and set up hint information
+ */
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;
- char msgstr[1024];
-
- qnostr[0] = 0;
- strcpy(msgstr, "");
- if (debug_level > 1)
- snprintf(qnostr, sizeof(qnostr), "[qno=0x%x]", qno++);
- hidestmt = false;
+ const char *prev_hint_str;
/*
* Use standard planner if pg_hint_plan is disabled or current nesting
if (!pg_hint_plan_enable_hint || hint_inhibit_level > 0)
{
if (debug_level > 1)
- elog(pg_hint_plan_message_level,
- "pg_hint_plan%s: planner: enable_hint=%d,"
- " hint_inhibit_level=%d",
- qnostr, pg_hint_plan_enable_hint, hint_inhibit_level);
- hidestmt = true;
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg ("pg_hint_plan%s: planner: enable_hint=%d,"
+ " hint_inhibit_level=%d",
+ qnostr, pg_hint_plan_enable_hint,
+ hint_inhibit_level),
+ errhidestmt(msgqno != qno)));
+ msgqno = qno;
goto standard_planner_proc;
}
- /* Create hint struct from client-supplied query string. */
- query = get_query_string();
-
/*
- * 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.
+ * Support for nested plpgsql functions. This is quite ugly but this is the
+ * only point I could find where I can get the query string.
*/
- 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);
- if (debug_level > 1)
- {
- if (hints)
- snprintf(msgstr, 1024, "hints from table: \"%s\":"
- " normalzed_query=\"%s\", application name =\"%s\"",
- hints, norm_query, application_name);
- else
- {
- ereport(pg_hint_plan_message_level,
- (errhidestmt(hidestmt),
- errmsg("pg_hint_plan%s:"
- " no match found in table:"
- " application name = \"%s\","
- " normalzed_query=\"%s\"",
- qnostr, application_name, norm_query)));
- hidestmt = true;
- }
- }
- }
- if (hints == NULL)
+ if (plpgsql_recurse_level > 0)
{
- hints = get_hints_from_comment(query);
+ MemoryContext oldcontext;
- if (debug_level > 1)
- {
- snprintf(msgstr, 1024, "hints in comment=\"%s\"",
- hints ? hints : "(none)");
- if (debug_level > 2 ||
- stmt_name || strcmp(query, debug_query_string))
- snprintf(msgstr + strlen(msgstr), 1024- strlen(msgstr),
- ", stmt=\"%s\", query=\"%s\", debug_query_string=\"%s\"",
- stmt_name, query, debug_query_string);
- }
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+ current_hint_str =
+ get_hints_from_comment((char *)error_context_stack->arg);
+ MemoryContextSwitchTo(oldcontext);
}
- hstate = create_hintstate(parse, hints);
-
/*
- * Use standard planner if the statement has not valid hint. Other hook
- * functions try to change plan with current_hint_state if any, so set it
- * to NULL.
+ * Query execution in extended protocol can be started without the analyze
+ * phase. In the case retrieve hint string here.
*/
- if (!hstate)
+ if (!current_hint_str)
+ get_current_hint_string(NULL, parse);
+
+ /* No hint, go the normal way */
+ if (!current_hint_str)
goto standard_planner_proc;
+ /* parse the hint into hint state struct */
+ hstate = create_hintstate(parse, pstrdup(current_hint_str));
+
+ /* run standard planner if the statement has not valid hint */
+ if (!hstate)
+ goto standard_planner_proc;
+
/*
* Push new hint struct to the hint stack to disable previous hint context.
*/
push_hint(hstate);
- /* Set GUC parameters which are specified with Set hint. */
- save_nestlevel =
- set_config_options(current_hint_state->set_hints,
+ /* Set scan enforcement here. */
+ save_nestlevel = NewGUCNestLevel();
+
+ /* Apply Set hints, then save it as the initial state */
+ setup_guc_enforcement(current_hint_state->set_hints,
current_hint_state->num_hints[HINT_TYPE_SET],
current_hint_state->context);
- /* save current status to current_hint_state */
- if (enable_seqscan)
- current_hint_state->init_scan_mask |= ENABLE_SEQSCAN;
- if (enable_indexscan)
- current_hint_state->init_scan_mask |= ENABLE_INDEXSCAN;
- if (enable_bitmapscan)
- current_hint_state->init_scan_mask |= ENABLE_BITMAPSCAN;
- if (enable_tidscan)
- current_hint_state->init_scan_mask |= ENABLE_TIDSCAN;
- if (enable_indexonlyscan)
- current_hint_state->init_scan_mask |= ENABLE_INDEXONLYSCAN;
- if (enable_nestloop)
- current_hint_state->init_join_mask |= ENABLE_NESTLOOP;
- if (enable_mergejoin)
- current_hint_state->init_join_mask |= ENABLE_MERGEJOIN;
- if (enable_hashjoin)
- current_hint_state->init_join_mask |= ENABLE_HASHJOIN;
+ current_hint_state->init_scan_mask = get_current_scan_mask();
+ current_hint_state->init_join_mask = get_current_join_mask();
+ current_hint_state->init_min_para_tablescan_size =
+ min_parallel_table_scan_size;
+ current_hint_state->init_min_para_indexscan_size =
+ min_parallel_index_scan_size;
+ current_hint_state->init_paratup_cost = parallel_tuple_cost;
+ current_hint_state->init_parasetup_cost = parallel_setup_cost;
+
+ /*
+ * max_parallel_workers_per_gather should be non-zero here if Workers hint
+ * is specified.
+ */
+ if (max_hint_nworkers > 0 && max_parallel_workers_per_gather < 1)
+ set_config_int32_option("max_parallel_workers_per_gather",
+ 1, current_hint_state->context);
+ current_hint_state->init_nworkers = max_parallel_workers_per_gather;
if (debug_level > 1)
{
- ereport(pg_hint_plan_message_level,
- (errhidestmt(hidestmt),
- errmsg("pg_hint_plan%s: planner: %s",
- qnostr, msgstr)));
- hidestmt = true;
+ ereport(pg_hint_plan_debug_message_level,
+ (errhidestmt(msgqno != qno),
+ errmsg("pg_hint_plan%s: planner", qnostr)));
+ msgqno = qno;
}
/*
+ * The planner call below may replace current_hint_str. Store and restore
+ * it so that the subsequent planning in the upper level doesn't get
+ * confused.
+ */
+ recurse_level++;
+ prev_hint_str = current_hint_str;
+
+ /*
* Use PG_TRY mechanism to recover GUC parameters and current_hint_state to
* the state when this planner started when error occurred in planner.
*/
result = (*prev_planner) (parse, cursorOptions, boundParams);
else
result = standard_planner(parse, cursorOptions, boundParams);
+
+ current_hint_str = prev_hint_str;
+ recurse_level--;
}
PG_CATCH();
{
* Rollback changes of GUC parameters, and pop current hint context
* from hint stack to rewind the state.
*/
+ current_hint_str = prev_hint_str;
+ recurse_level--;
AtEOXact_GUC(true, save_nestlevel);
pop_hint();
PG_RE_THROW();
}
PG_END_TRY();
+
+ /*
+ * current_hint_str is useless after planning of the top-level query.
+ */
+ if (recurse_level < 1 && current_hint_str)
+ {
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
+ current_hint_retrieved = false;
+ }
+
/* Print hint in debug mode. */
if (debug_level == 1)
HintStateDump(current_hint_state);
standard_planner_proc:
if (debug_level > 1)
{
- ereport(pg_hint_plan_message_level,
- (errhidestmt(hidestmt),
- errmsg("pg_hint_plan%s: planner: no valid hint (%s)",
- qnostr, msgstr)));
- hidestmt = true;
+ ereport(pg_hint_plan_debug_message_level,
+ (errhidestmt(msgqno != qno),
+ errmsg("pg_hint_plan%s: planner: no valid hint",
+ qnostr)));
+ msgqno = qno;
}
current_hint_state = NULL;
if (prev_planner)
}
/*
- * Return scan method hint which matches given aliasname.
+ * Find scan method hint to be applied to the given relation
+ *
*/
static ScanMethodHint *
-find_scan_hint(PlannerInfo *root, Index relid, RelOptInfo *rel)
+find_scan_hint(PlannerInfo *root, Index relid)
{
+ RelOptInfo *rel;
RangeTblEntry *rte;
+ ScanMethodHint *real_name_hint = NULL;
+ ScanMethodHint *alias_hint = NULL;
int i;
+ /* This should not be a join rel */
+ Assert(relid > 0);
+ rel = root->simple_rel_array[relid];
+
/*
- * We can't apply scan method hint if the relation is:
- * - not a base relation
- * - not an ordinary relation (such as join and subquery)
+ * This function is called for any RelOptInfo or its inheritance parent if
+ * any. If we are called from inheritance planner, the RelOptInfo for the
+ * parent of target child relation is not set in the planner info.
+ *
+ * Otherwise we should check that the reloptinfo is base relation or
+ * inheritance children.
*/
- if (rel && (rel->reloptkind != RELOPT_BASEREL || rel->rtekind != RTE_RELATION))
+ if (rel &&
+ rel->reloptkind != RELOPT_BASEREL &&
+ rel->reloptkind != RELOPT_OTHER_MEMBER_REL)
return NULL;
+ /*
+ * This is baserel or appendrel children. We can refer to RangeTblEntry.
+ */
rte = root->simple_rte_array[relid];
+ Assert(rte);
- /* We can't force scan method of foreign tables */
- if (rte->relkind == RELKIND_FOREIGN_TABLE)
+ /* We don't hint on other than relation and foreign tables */
+ if (rte->rtekind != RTE_RELATION ||
+ rte->relkind == RELKIND_FOREIGN_TABLE)
return NULL;
/* Find scan method hint, which matches given names, from the list. */
if (!hint_state_enabled(hint))
continue;
- if (RelnameCmp(&rte->eref->aliasname, &hint->relname) == 0)
- return hint;
+ if (!alias_hint &&
+ RelnameCmp(&rte->eref->aliasname, &hint->relname) == 0)
+ alias_hint = hint;
+
+ /* check the real name for appendrel children */
+ if (!real_name_hint &&
+ rel && rel->reloptkind == RELOPT_OTHER_MEMBER_REL)
+ {
+ char *realname = get_rel_name(rte->relid);
+
+ if (realname && RelnameCmp(&realname, &hint->relname) == 0)
+ real_name_hint = hint;
+ }
+
+ /* No more match expected, break */
+ if(alias_hint && real_name_hint)
+ break;
}
- return NULL;
+ /* real name match precedes alias match */
+ if (real_name_hint)
+ return real_name_hint;
+
+ return alias_hint;
+}
+
+static ParallelHint *
+find_parallel_hint(PlannerInfo *root, Index relid)
+{
+ RelOptInfo *rel;
+ RangeTblEntry *rte;
+ ParallelHint *real_name_hint = NULL;
+ ParallelHint *alias_hint = NULL;
+ int i;
+
+ /* This should not be a join rel */
+ Assert(relid > 0);
+ rel = root->simple_rel_array[relid];
+
+ /*
+ * Parallel planning is appliable only on base relation, which has
+ * RelOptInfo.
+ */
+ if (!rel)
+ return NULL;
+
+ /*
+ * We have set root->glob->parallelModeOK if needed. What we should do here
+ * is just following the decision of planner.
+ */
+ if (!rel->consider_parallel)
+ return NULL;
+
+ /*
+ * This is baserel or appendrel children. We can refer to RangeTblEntry.
+ */
+ rte = root->simple_rte_array[relid];
+ Assert(rte);
+
+ /* Find parallel method hint, which matches given names, from the list. */
+ for (i = 0; i < current_hint_state->num_hints[HINT_TYPE_PARALLEL]; i++)
+ {
+ ParallelHint *hint = current_hint_state->parallel_hints[i];
+
+ /* We ignore disabled hints. */
+ if (!hint_state_enabled(hint))
+ continue;
+
+ if (!alias_hint &&
+ RelnameCmp(&rte->eref->aliasname, &hint->relname) == 0)
+ alias_hint = hint;
+
+ /* check the real name for appendrel children */
+ if (!real_name_hint &&
+ rel && rel->reloptkind == RELOPT_OTHER_MEMBER_REL)
+ {
+ char *realname = get_rel_name(rte->relid);
+
+ if (realname && RelnameCmp(&realname, &hint->relname) == 0)
+ real_name_hint = hint;
+ }
+
+ /* No more match expected, break */
+ if(alias_hint && real_name_hint)
+ break;
+ }
+
+ /* real name match precedes alias match */
+ if (real_name_hint)
+ return real_name_hint;
+
+ return alias_hint;
}
/*
return DatumGetBool(result);
}
+
+/* Remove indexes instructed not to use by hint. */
static void
-delete_indexes(ScanMethodHint *hint, RelOptInfo *rel, Oid relationObjectId)
+restrict_indexes(PlannerInfo *root, ScanMethodHint *hint, RelOptInfo *rel,
+ bool using_parent_hint)
{
ListCell *cell;
ListCell *prev;
ListCell *next;
StringInfoData buf;
+ RangeTblEntry *rte = root->simple_rte_array[rel->relid];
+ Oid relationObjectId = rte->relid;
/*
* We delete all the IndexOptInfo list and prevent you from being usable by
}
/*
- * to make the index a candidate when definition of this index is
- * matched with the index's definition of current_hint_state.
+ * Apply index restriction of parent hint to children. Since index
+ * inheritance is not explicitly described we should search for an
+ * children's index with the same definition to that of the parent.
*/
- if (OidIsValid(relationObjectId) && !use_index)
+ if (using_parent_hint && !use_index)
{
foreach(l, current_hint_state->parent_index_infos)
{
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)
+ /*
+ * we check the 'same' index by comparing uniqueness, access
+ * method and index key columns.
+ */
+ if (p_info->indisunique != info->unique ||
+ p_info->method != info->relam ||
+ list_length(p_info->column_names) != info->ncolumns)
continue;
- /* check to match the indexkey's configuration */
+ /* Check if index key columns match */
for (i = 0; i < info->ncolumns; i++)
{
char *c_attname = NULL;
char *p_attname = NULL;
- p_attname =
- list_nth(p_info->column_names, i);
+ p_attname = list_nth(p_info->column_names, i);
- /* both are expressions */
+ /*
+ * if both of the key of the same position are expressions,
+ * ignore them for now and check later.
+ */
if (info->indexkeys[i] == 0 && !p_attname)
continue;
- /* one's column is expression, the other is not */
+ /* deny if one is expression while another 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])
+ info->indexkeys[i], false);
+
+ /* deny if any of column attributes don't match */
+ if (strcmp(p_attname, c_attname) != 0 ||
+ p_info->indcollation[i] != info->indexcollations[i] ||
+ p_info->opclass[i] != info->opcintype[i]||
+ ((p_info->indoption[i] & INDOPTION_DESC) != 0)
+ != info->reverse_sort[i] ||
+ ((p_info->indoption[i] & INDOPTION_NULLS_FIRST) != 0)
+ != info->nulls_first[i])
break;
-
- if (((p_info->indoption[i] & INDOPTION_NULLS_FIRST) != 0) !=
- info->nulls_first[i])
- break;
-
}
+ /* deny this if any difference found */
if (i != info->ncolumns)
continue;
+ /* check on key expressions */
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
- */
+ /* fetch the index of this child */
ht_idx = SearchSysCache1(INDEXRELID,
ObjectIdGetDatum(info->indexoid));
- /* check to match the expression's parameter of index */
+ /* check expressions if both expressions are available */
if (p_info->expression_str &&
- !heap_attisnull(ht_idx, Anum_pg_index_indexprs))
+ !heap_attisnull(ht_idx, Anum_pg_index_indexprs, NULL))
{
Datum exprsDatum;
bool isnull;
ObjectIdGetDatum(
relationObjectId));
+ /* deny if expressions don't match */
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 */
+ /* compare index predicates */
if (p_info->indpred_str &&
- !heap_attisnull(ht_idx, Anum_pg_index_indpred))
+ !heap_attisnull(ht_idx, Anum_pg_index_indpred, NULL))
{
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);
{
/* Clean up */
ReleaseSysCache(ht_idx);
-
continue;
}
}
if (debug_level == 1)
{
- char *relname;
StringInfoData rel_buf;
+ char *disprelname = "";
- if (OidIsValid(relationObjectId))
- relname = get_rel_name(relationObjectId);
+ /*
+ * If this hint targetted the parent, use the real name of this
+ * child. Otherwise use hint specification.
+ */
+ if (using_parent_hint)
+ disprelname = get_rel_name(rte->relid);
else
- relname = hint->relname;
+ disprelname = hint->relname;
+
initStringInfo(&rel_buf);
- quote_value(&rel_buf, relname);
+ quote_value(&rel_buf, disprelname);
- ereport(LOG,
+ ereport(pg_hint_plan_debug_message_level,
(errmsg("available indexes for %s(%s):%s",
hint->base.keyword,
rel_buf.data,
p_info->opclass = (Oid *) palloc(sizeof(Oid) * index->indnatts);
p_info->indoption = (int16 *) palloc(sizeof(Oid) * index->indnatts);
+ /*
+ * Collect relation attribute names of index columns for index
+ * identification, not index attribute names. NULL means expression index
+ * columns.
+ */
for (i = 0; i < index->indnatts; i++)
{
- attname = get_attname(relid, index->indkey.values[i]);
+ attname = get_attname(relid, index->indkey.values[i], true);
p_info->column_names = lappend(p_info->column_names, attname);
p_info->indcollation[i] = indexRelation->rd_indcollation[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))
+ if(!heap_attisnull(indexRelation->rd_indextuple, Anum_pg_index_indexprs,
+ NULL))
{
Datum exprsDatum;
bool isnull;
* 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(!heap_attisnull(indexRelation->rd_indextuple, Anum_pg_index_indpred,
+ NULL))
{
Datum predDatum;
bool isnull;
return p_info;
}
+/*
+ * cancel hint enforcement
+ */
static void
-pg_hint_plan_get_relation_info(PlannerInfo *root, Oid relationObjectId,
- bool inhparent, RelOptInfo *rel)
+reset_hint_enforcement()
{
- ScanMethodHint *hint = NULL;
- ListCell *l;
- Index new_parent_relid = 0;
+ setup_scan_method_enforcement(NULL, current_hint_state);
+ setup_parallel_plan_enforcement(NULL, current_hint_state);
+}
- if (prev_get_relation_info)
- (*prev_get_relation_info) (root, relationObjectId, inhparent, rel);
+/*
+ * Set planner guc parameters according to corresponding scan hints. Returns
+ * bitmap of HintTypeBitmap. If shint or phint is not NULL, set used hint
+ * there respectively.
+ */
+static int
+setup_hint_enforcement(PlannerInfo *root, RelOptInfo *rel,
+ ScanMethodHint **rshint, ParallelHint **rphint)
+{
+ Index new_parent_relid = 0;
+ ListCell *l;
+ ScanMethodHint *shint = NULL;
+ ParallelHint *phint = NULL;
+ bool inhparent = root->simple_rte_array[rel->relid]->inh;
+ Oid relationObjectId = root->simple_rte_array[rel->relid]->relid;
+ int ret = 0;
- /*
- * Do nothing if we don't have a valid hint in this context or current
- * nesting depth is at SPI calls.
- */
- if (!current_hint_state || hint_inhibit_level > 0)
- {
- if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
- (errhidestmt(true),
- errmsg ("pg_hint_plan%s: get_relation_info"
- " no hint to apply: relation=%u(%s), inhparent=%d,"
- " current_hint=%p, hint_inhibit_level=%d",
- qnostr, relationObjectId,
- get_rel_name(relationObjectId),
- inhparent, current_hint_state,
- hint_inhibit_level)));
- return;
- }
+ /* reset returns if requested */
+ if (rshint != NULL) *rshint = NULL;
+ if (rphint != NULL) *rphint = NULL;
/*
* We could register the parent relation of the following children here
- * when inhparent == true but inheritnce planner doesn't request
- * information for inheritance parents. We also cannot distinguish the
- * caller so we should always find the parents without this function being
- * called for them.
+ * when inhparent == true but inheritnce planner doesn't call this function
+ * for parents. Since we cannot distinguish who called this function we
+ * cannot do other than always seeking the parent regardless of who called
+ * this function.
*/
if (inhparent)
{
+ /* set up only parallel hints for parent relation */
+ phint = find_parallel_hint(root, rel->relid);
+ if (phint)
+ {
+ setup_parallel_plan_enforcement(phint, current_hint_state);
+ if (rphint) *rphint = phint;
+ ret |= HINT_BM_PARALLEL;
+ return ret;
+ }
+
if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
+ ereport(pg_hint_plan_debug_message_level,
(errhidestmt(true),
- errmsg ("pg_hint_plan%s: get_relation_info"
+ errmsg ("pg_hint_plan%s: setup_hint_enforcement"
" skipping inh parent: relation=%u(%s), inhparent=%d,"
" current_hint_state=%p, hint_inhibit_level=%d",
qnostr, relationObjectId,
get_rel_name(relationObjectId),
inhparent, current_hint_state, hint_inhibit_level)));
- return;
+ return 0;
}
- /* Find the parent for this relation */
+ /* Forget about the parent of another subquery */
+ if (root != current_hint_state->current_root)
+ current_hint_state->parent_relid = 0;
+
+ /* Find the parent for this relation other than the registered parent */
foreach (l, root->append_rel_list)
{
AppendRelInfo *appinfo = (AppendRelInfo *) lfirst(l);
if (appinfo->child_relid == rel->relid)
{
if (current_hint_state->parent_relid != appinfo->parent_relid)
+ {
new_parent_relid = appinfo->parent_relid;
+ current_hint_state->current_root = root;
+ }
break;
}
}
{
/* This relation doesn't have a parent. Cancel current_hint_state. */
current_hint_state->parent_relid = 0;
- current_hint_state->parent_hint = NULL;
+ current_hint_state->parent_scan_hint = NULL;
+ current_hint_state->parent_parallel_hint = NULL;
}
if (new_parent_relid > 0)
{
/*
- * Here we found a parent relation different from the remembered one.
- * Remember it, apply the scan mask of it and then resolve the index
- * restriction in order to be used by its children.
+ * Here we found a new parent for the current relation. Scan continues
+ * hint to other childrens of this parent so remember it to avoid
+ * redundant setup cost.
*/
- int scanmask = current_hint_state->init_scan_mask;
- ScanMethodHint *parent_hint;
-
current_hint_state->parent_relid = new_parent_relid;
+ /* Find hints for the parent */
+ current_hint_state->parent_scan_hint =
+ find_scan_hint(root, current_hint_state->parent_relid);
+
+ current_hint_state->parent_parallel_hint =
+ find_parallel_hint(root, current_hint_state->parent_relid);
+
/*
- * Get and apply the hint for the new parent relation. It should be an
- * ordinary relation so calling find_scan_hint with rel == NULL is
- * safe.
+ * If hint is found for the parent, apply it for this child instead
+ * of its own.
*/
- current_hint_state->parent_hint = parent_hint =
- find_scan_hint(root, current_hint_state->parent_relid, NULL);
-
- if (parent_hint)
+ if (current_hint_state->parent_scan_hint)
{
- scanmask = current_hint_state->parent_hint->enforce_mask;
- parent_hint->base.state = HINT_STATE_USED;
+ ScanMethodHint * pshint = current_hint_state->parent_scan_hint;
+
+ pshint->base.state = HINT_STATE_USED;
- /* Resolve index name mask (if any) using the parent. */
- if (parent_hint->indexnames)
+ /* Apply index mask in the same manner to the parent. */
+ if (pshint->indexnames)
{
Oid parentrel_oid;
Relation parent_rel;
ListCell *lc;
ParentIndexInfo *parent_index_info;
- foreach(lc, parent_hint->indexnames)
+ foreach(lc, pshint->indexnames)
{
if (RelnameCmp(&indexname, &lfirst(lc)) == 0)
break;
parent_index_info =
get_parent_index_info(indexoid, parentrel_oid);
current_hint_state->parent_index_infos =
- lappend(current_hint_state->parent_index_infos, parent_index_info);
+ lappend(current_hint_state->parent_index_infos,
+ parent_index_info);
}
heap_close(parent_rel, NoLock);
}
}
-
- set_scan_config_options(scanmask, current_hint_state->context);
}
- if (current_hint_state->parent_hint != 0)
+ shint = find_scan_hint(root, rel->relid);
+ if (!shint)
+ shint = current_hint_state->parent_scan_hint;
+
+ if (shint)
{
- delete_indexes(current_hint_state->parent_hint, rel,
- relationObjectId);
+ bool using_parent_hint =
+ (shint == current_hint_state->parent_scan_hint);
- /* Scan fixation status is the same to the parent. */
- if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
- (errhidestmt(true),
- errmsg("pg_hint_plan%s: get_relation_info:"
- " index deletion by parent hint: "
- "relation=%u(%s), inhparent=%d, current_hint_state=%p,"
- " hint_inhibit_level=%d",
- qnostr, relationObjectId,
- get_rel_name(relationObjectId),
- inhparent, current_hint_state, hint_inhibit_level)));
- return;
- }
+ ret |= HINT_BM_SCAN_METHOD;
- /* This table doesn't have a parent hint. Apply its own hint if any. */
- if ((hint = find_scan_hint(root, rel->relid, rel)) != NULL)
- {
- set_scan_config_options(hint->enforce_mask,
- current_hint_state->context);
- hint->base.state = HINT_STATE_USED;
+ /* Setup scan enforcement environment */
+ setup_scan_method_enforcement(shint, current_hint_state);
- delete_indexes(hint, rel, InvalidOid);
+ /* restrict unwanted inexes */
+ restrict_indexes(root, shint, rel, using_parent_hint);
if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
+ {
+ char *additional_message = "";
+
+ if (shint == current_hint_state->parent_scan_hint)
+ additional_message = " by parent hint";
+
+ ereport(pg_hint_plan_debug_message_level,
(errhidestmt(true),
- errmsg ("pg_hint_plan%s: get_relation_info"
- " index deletion:"
- " relation=%u(%s), inhparent=%d, current_hint=%p,"
+ errmsg ("pg_hint_plan%s: setup_hint_enforcement"
+ " index deletion%s:"
+ " relation=%u(%s), inhparent=%d, "
+ "current_hint_state=%p,"
" hint_inhibit_level=%d, scanmask=0x%x",
- qnostr, relationObjectId,
+ qnostr, additional_message,
+ relationObjectId,
get_rel_name(relationObjectId),
- inhparent, current_hint_state, hint_inhibit_level,
- hint->enforce_mask)));
+ inhparent, current_hint_state,
+ hint_inhibit_level,
+ shint->enforce_mask)));
+ }
}
- else
+
+ /* Do the same for parallel plan enforcement */
+ phint = find_parallel_hint(root, rel->relid);
+ if (!phint)
+ phint = current_hint_state->parent_parallel_hint;
+
+ setup_parallel_plan_enforcement(phint, current_hint_state);
+
+ if (phint)
+ ret |= HINT_BM_PARALLEL;
+
+ /* Nothing to apply. Reset the scan mask to intial state */
+ if (!shint && ! phint)
{
if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
+ ereport(pg_hint_plan_debug_message_level,
(errhidestmt (true),
- errmsg ("pg_hint_plan%s: get_relation_info"
+ errmsg ("pg_hint_plan%s: setup_hint_enforcement"
" no hint applied:"
" relation=%u(%s), inhparent=%d, current_hint=%p,"
" hint_inhibit_level=%d, scanmask=0x%x",
get_rel_name(relationObjectId),
inhparent, current_hint_state, hint_inhibit_level,
current_hint_state->init_scan_mask)));
- set_scan_config_options(current_hint_state->init_scan_mask,
- current_hint_state->context);
+
+ setup_scan_method_enforcement(NULL, current_hint_state);
+
+ return ret;
}
- return;
+
+ if (rshint != NULL) *rshint = shint;
+ if (rphint != NULL) *rphint = phint;
+
+ return ret;
}
/*
}
/*
- * set_plain_rel_pathlist
- * Build access paths for a plain relation (no subquery, no inheritance)
- *
- * This function was copied and edited from set_plain_rel_pathlist() in
- * src/backend/optimizer/path/allpaths.c
- *
- * - removed parallel stuff.
- */
-static void
-set_plain_rel_pathlist(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
-{
- Relids required_outer;
-
- /*
- * We don't support pushing join clauses into the quals of a seqscan, but
- * it could still have required parameterization due to LATERAL refs in
- * its tlist.
- */
- required_outer = rel->lateral_relids;
-
- /* Consider sequential scan */
- add_path(rel, create_seqscan_path(root, rel, required_outer, 0));
-
- /* Consider index scans */
- create_index_paths(root, rel);
-
- /* Consider TID scans */
- create_tidscan_paths(root, rel);
-}
-
-/*
- * Clear exiting access paths and create new ones applying hints.
- * This does the similar to set_rel_pathlist
- */
-static void
-rebuild_scan_path(HintState *hstate, PlannerInfo *root, int level,
- List *initial_rels)
-{
- ListCell *l;
-
- foreach(l, initial_rels)
- {
- RelOptInfo *rel = (RelOptInfo *) lfirst(l);
- RangeTblEntry *rte;
- ScanMethodHint *hint;
-
- /* 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];
-
- /* We can't force scan method of foreign tables */
- if (rte->relkind == RELKIND_FOREIGN_TABLE)
- continue;
-
- /*
- * 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->relid, rel)) == NULL)
- set_scan_config_options(hstate->init_scan_mask,
- hstate->context);
- else
- {
- set_scan_config_options(hint->enforce_mask, hstate->context);
- hint->base.state = HINT_STATE_USED;
- }
-
- list_free_deep(rel->pathlist);
- rel->pathlist = NIL;
- if (rte->inh)
- {
- /* It's an "append relation", process accordingly */
- set_append_rel_pathlist(root, rel, rel->relid, rte);
- }
- else
- {
- set_plain_rel_pathlist(root, rel, rte);
- }
-
- set_cheapest(rel);
- }
-
- /*
- * Restore the GUC variables we set above.
- */
- set_scan_config_options(hstate->init_scan_mask, hstate->context);
-}
-
-/*
* wrapper of make_join_rel()
*
* call make_join_rel() after changing enable_* parameters according to given
SpecialJoinInfo *sjinfo,
List *restrictlist)
{
- ScanMethodHint *scan_hint = NULL;
Relids joinrelids;
JoinMethodHint *join_hint;
int save_nestlevel;
- if ((scan_hint = find_scan_hint(root, innerrel->relid, innerrel)) != NULL)
- {
- set_scan_config_options(scan_hint->enforce_mask,
- current_hint_state->context);
- scan_hint->base.state = HINT_STATE_USED;
- }
-
joinrelids = bms_union(outerrel->relids, innerrel->relids);
join_hint = find_join_hint(joinrelids);
bms_free(joinrelids);
else
add_paths_to_joinrel(root, joinrel, outerrel, innerrel, jointype,
sjinfo, restrictlist);
-
- if (scan_hint != NULL)
- set_scan_config_options(current_hint_state->init_scan_mask,
- current_hint_state->context);
}
static int
return standard_join_search(root, levels_needed, initial_rels);
}
- /* apply scan method hint rebuild scan path. */
- rebuild_scan_path(current_hint_state, root, levels_needed, initial_rels);
-
/*
* In the case using GEQO, only scan method hints and Set hints have
* effect. Join method and join order is not controllable by hints.
rel = pg_hint_plan_standard_join_search(root, levels_needed, initial_rels);
+ /*
+ * Adjust number of parallel workers of the result rel to the largest
+ * number of the component paths.
+ */
+ if (current_hint_state->num_hints[HINT_TYPE_PARALLEL] > 0)
+ {
+ ListCell *lc;
+ int nworkers = 0;
+
+ foreach (lc, initial_rels)
+ {
+ ListCell *lcp;
+ RelOptInfo *rel = (RelOptInfo *) lfirst(lc);
+
+ foreach (lcp, rel->partial_pathlist)
+ {
+ Path *path = (Path *) lfirst(lcp);
+
+ if (nworkers < path-> parallel_workers)
+ nworkers = path-> parallel_workers;
+ }
+ }
+
+ foreach (lc, rel->partial_pathlist)
+ {
+ Path *path = (Path *) lfirst(lc);
+
+ if (path->parallel_safe && path->parallel_workers < nworkers)
+ path->parallel_workers = nworkers;
+ }
+ }
+
for (i = 2; i <= nbaserel; i++)
{
list_free(current_hint_state->join_hint_level[i]);
}
/*
+ * Force number of wokers if instructed by hint
+ */
+void
+pg_hint_plan_set_rel_pathlist(PlannerInfo * root, RelOptInfo *rel,
+ Index rti, RangeTblEntry *rte)
+{
+ ParallelHint *phint;
+ ListCell *l;
+ int found_hints;
+
+ /* call the previous hook */
+ if (prev_set_rel_pathlist)
+ prev_set_rel_pathlist(root, rel, rti, rte);
+
+ /* Nothing to do if no hint available */
+ if (current_hint_state == NULL)
+ return;
+
+ /* Don't touch dummy rels. */
+ if (IS_DUMMY_REL(rel))
+ return;
+
+ /*
+ * We can accept only plain relations, foreign tables and table saples are
+ * also unacceptable. See set_rel_pathlist.
+ */
+ if ((rel->rtekind != RTE_RELATION &&
+ rel->rtekind != RTE_SUBQUERY)||
+ rte->relkind == RELKIND_FOREIGN_TABLE ||
+ rte->tablesample != NULL)
+ return;
+
+ /*
+ * Even though UNION ALL node doesn't have particular name so usually it is
+ * unhintable, turn on parallel when it contains parallel nodes.
+ */
+ if (rel->rtekind == RTE_SUBQUERY)
+ {
+ ListCell *lc;
+ bool inhibit_nonparallel = false;
+
+ if (rel->partial_pathlist == NIL)
+ return;
+
+ foreach(lc, rel->partial_pathlist)
+ {
+ ListCell *lcp;
+ AppendPath *apath = (AppendPath *) lfirst(lc);
+ int parallel_workers = 0;
+
+ if (!IsA(apath, AppendPath))
+ continue;
+
+ foreach (lcp, apath->subpaths)
+ {
+ Path *spath = (Path *) lfirst(lcp);
+
+ if (spath->parallel_aware &&
+ parallel_workers < spath->parallel_workers)
+ parallel_workers = spath->parallel_workers;
+ }
+
+ apath->path.parallel_workers = parallel_workers;
+ inhibit_nonparallel = true;
+ }
+
+ if (inhibit_nonparallel)
+ {
+ ListCell *lc;
+
+ foreach(lc, rel->pathlist)
+ {
+ Path *path = (Path *) lfirst(lc);
+
+ if (path->startup_cost < disable_cost)
+ {
+ path->startup_cost += disable_cost;
+ path->total_cost += disable_cost;
+ }
+ }
+ }
+
+ return;
+ }
+
+ /* We cannot handle if this requires an outer */
+ if (rel->lateral_relids)
+ return;
+
+ /* Return if this relation gets no enfocement */
+ if ((found_hints = setup_hint_enforcement(root, rel, NULL, &phint)) == 0)
+ return;
+
+ /* Here, we regenerate paths with the current hint restriction */
+ if (found_hints & HINT_BM_SCAN_METHOD || found_hints & HINT_BM_PARALLEL)
+ {
+ /*
+ * When hint is specified on non-parent relations, discard existing
+ * paths and regenerate based on the hint considered. Otherwise we
+ * already have hinted childx paths then just adjust the number of
+ * planned number of workers.
+ */
+ if (root->simple_rte_array[rel->relid]->inh)
+ {
+ /* enforce number of workers if requested */
+ if (phint && phint->force_parallel)
+ {
+ if (phint->nworkers == 0)
+ {
+ list_free_deep(rel->partial_pathlist);
+ rel->partial_pathlist = NIL;
+ }
+ else
+ {
+ /* prioritize partial paths */
+ foreach (l, rel->partial_pathlist)
+ {
+ Path *ppath = (Path *) lfirst(l);
+
+ if (ppath->parallel_safe)
+ {
+ ppath->parallel_workers = phint->nworkers;
+ ppath->startup_cost = 0;
+ ppath->total_cost = 0;
+ }
+ }
+
+ /* disable non-partial paths */
+ foreach (l, rel->pathlist)
+ {
+ Path *ppath = (Path *) lfirst(l);
+
+ if (ppath->startup_cost < disable_cost)
+ {
+ ppath->startup_cost += disable_cost;
+ ppath->total_cost += disable_cost;
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+ /* Just discard all the paths considered so far */
+ list_free_deep(rel->pathlist);
+ rel->pathlist = NIL;
+ list_free_deep(rel->partial_pathlist);
+ rel->partial_pathlist = NIL;
+
+ /* Regenerate paths with the current enforcement */
+ set_plain_rel_pathlist(root, rel, rte);
+
+ /* Additional work to enforce parallel query execution */
+ if (phint && phint->nworkers > 0)
+ {
+ /*
+ * For Parallel Append to be planned properly, we shouldn't set
+ * the costs of non-partial paths to disable-value. Lower the
+ * priority of non-parallel paths by setting partial path costs
+ * to 0 instead.
+ */
+ foreach (l, rel->partial_pathlist)
+ {
+ Path *path = (Path *) lfirst(l);
+
+ path->startup_cost = 0;
+ path->total_cost = 0;
+ }
+
+ /* enforce number of workers if requested */
+ if (phint->force_parallel)
+ {
+ foreach (l, rel->partial_pathlist)
+ {
+ Path *ppath = (Path *) lfirst(l);
+
+ if (ppath->parallel_safe)
+ ppath->parallel_workers = phint->nworkers;
+ }
+ }
+
+ /* Generate gather paths */
+ if (rel->reloptkind == RELOPT_BASEREL &&
+ bms_membership(root->all_baserels) != BMS_SINGLETON)
+ generate_gather_paths(root, rel, false);
+ }
+ }
+ }
+
+ reset_hint_enforcement();
+}
+
+/*
* set_rel_pathlist
* Build access paths for a base relation
*
* This function was copied and edited from set_rel_pathlist() in
- * src/backend/optimizer/path/allpaths.c
+ * src/backend/optimizer/path/allpaths.c in order not to copy other static
+ * functions not required here.
*/
static void
set_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
bool isTopLevel,
void *arg)
{
- if (phase != RESOURCE_RELEASE_AFTER_LOCKS)
+ if (!isTopLevel || phase != RESOURCE_RELEASE_AFTER_LOCKS)
return;
/* Cancel plpgsql nest level*/
plpgsql_recurse_level = 0;
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