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
{
static void push_hint(HintState *hstate);
static void pop_hint(void);
-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, QueryCompletion *qc);
static PlannedStmt *pg_hint_plan_planner(Query *parse, const char *query_string,
int cursorOptions,
ParamListInfo boundParams);
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);
RelOptInfo *pg_hint_plan_make_join_rel(PlannerInfo *root, RelOptInfo *rel1,
RelOptInfo *rel2);
};
/* Saved hook values in case of unload */
-static post_parse_analyze_hook_type prev_post_parse_analyze_hook = NULL;
static planner_hook_type prev_planner = 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;
NULL);
/* Install hooks. */
- 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_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. */
- post_parse_analyze_hook = prev_post_parse_analyze_hook;
planner_hook = prev_planner;
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");
}
/*
- * 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(ParseState *pstate, Query *query, Query **jumblequery)
-{
- const char *p = debug_query_string;
-
- /*
- * 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 (pstate && pstate->p_sourcetext)
- 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;
-
- /*
- * 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.
- */
- 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;
- }
-
- 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);
-
- if (entry->plansource->is_valid)
- {
- p = entry->plansource->query_string;
- target_query = (Query *) linitial (entry->plansource->query_list);
- }
- else
- {
- /* igonre the hint for EXECUTE if invalidated */
- p = NULL;
- target_query = NULL;
- }
- }
-
- /* JumbleQuery accespts only a non-utility Query */
- if (target_query &&
- (!IsA(target_query, Query) ||
- target_query->utilityStmt != NULL))
- target_query = NULL;
-
- if (jumblequery)
- *jumblequery = target_query;
- }
- /*
- * 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;
-}
-
-/*
* Get hints from the head block comment in client-supplied query string.
*/
static const char *
* Retrieve and store hint string from given query or from the hint table.
*/
static void
-get_current_hint_string(ParseState *pstate, Query *query)
+get_current_hint_string(Query *query, const char *query_str)
{
- const char *query_str;
MemoryContext oldcontext;
- /* do nothing under hint table search */
+ /* do nothing while scanning hint table */
if (hint_inhibit_level > 0)
return;
- /* We alredy have one, don't parse it again. */
- if (current_hint_retrieved)
- return;
-
- /* Don't parse the current query hereafter */
- current_hint_retrieved = true;
-
- if (!pg_hint_plan_enable_hint)
+ /* Make sure trashing old hint string */
+ if (current_hint_str)
{
- if (current_hint_str)
- {
- pfree((void *)current_hint_str);
- current_hint_str = NULL;
- }
- return;
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
}
+ /* Return if nothing to do. */
+ if (!pg_hint_plan_enable_hint || !query_str)
+ return;
+
/* increment the query number */
qnostr[0] = 0;
if (debug_level > 1)
/* search the hint table for a hint if requested */
if (pg_hint_plan_enable_hint_table)
{
+ JumbleState *jstate;
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;
+ char *normalized_query;
- /* clear the previous hint string */
- if (current_hint_str)
- {
- pfree((void *)current_hint_str);
- current_hint_str = NULL;
- }
-
- if (jumblequery)
- {
- /*
- * 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;
+ jstate = JumbleQuery(query, query_str);
- 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, 0, &query_len,
- GetDatabaseEncoding());
+ /*
+ * 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, 0, &query_len);
- /*
- * 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);
+ /*
+ * 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;
- }
+ if (debug_level > 1)
+ {
+ if (current_hint_str)
+ ereport(pg_hint_plan_debug_message_level,
+ (errmsg("pg_hint_plan[qno=0x%x]: "
+ "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;
}
- /* retrun if we have hint here */
+ /* retrun if we have hint string here */
if (current_hint_str)
return;
}
- else
- query_str = get_query_string(pstate, query, NULL);
-
- 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);
- }
- else
- {
- /*
- * Failed to get query. We would be in fetching invalidated
- * plancache. Try the next chance.
- */
- current_hint_retrieved = false;
- }
+ /* get hints from the comment */
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+ current_hint_str = get_hints_from_comment(query_str);
+ MemoryContextSwitchTo(oldcontext);
if (debug_level > 1)
{
}
/*
- * Retrieve hint string from the current query.
- */
-static void
-pg_hint_plan_post_parse_analyze(ParseState *pstate, Query *query)
-{
- if (prev_post_parse_analyze_hook)
- prev_post_parse_analyze_hook(pstate, query);
-
- /* always retrieve hint from the top-level query string */
- if (plpgsql_recurse_level == 0)
- current_hint_retrieved = false;
-
- get_current_hint_string(pstate, query);
-}
-
-/*
- * 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
-pg_hint_plan_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
- ProcessUtilityContext context,
- ParamListInfo params, QueryEnvironment *queryEnv,
- DestReceiver *dest, QueryCompletion *qc)
-{
- if (prev_ProcessUtility_hook)
- prev_ProcessUtility_hook(pstmt, queryString, context, params, queryEnv,
- dest, qc);
- else
- standard_ProcessUtility(pstmt, queryString, context, params, queryEnv,
- dest, qc);
-
- if (plpgsql_recurse_level == 0)
- current_hint_retrieved = false;
-}
-
-/*
* Read and set up hint information
*/
static PlannedStmt *
goto standard_planner_proc;
}
- /*
- * 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 (plpgsql_recurse_level > 0 &&
- error_context_stack && error_context_stack->arg)
+ /* always retrieve hint from the top-level query string */
+ if (plpgsql_recurse_level == 0 && current_hint_str)
{
- MemoryContext oldcontext;
-
- oldcontext = MemoryContextSwitchTo(TopMemoryContext);
- current_hint_str =
- get_hints_from_comment((char *)error_context_stack->arg);
- MemoryContextSwitchTo(oldcontext);
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
}
- /*
- * Query execution in extended protocol can be started without the analyze
- * phase. In the case retrieve hint string here.
- */
- if (!current_hint_str)
- get_current_hint_string(NULL, parse);
+ get_current_hint_string(parse, query_string);
/* No hint, go the normal way */
if (!current_hint_str)
/* 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 */
+ /* run standard planner if we're given with no valid hints */
if (!hstate)
+ {
+ /* forget invalid hint string */
+ if (current_hint_str)
+ {
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
+ }
+
goto standard_planner_proc;
+ }
/*
* Push new hint struct to the hint stack to disable previous hint context.
{
pfree((void *)current_hint_str);
current_hint_str = NULL;
- current_hint_retrieved = false;
}
/* Print hint in debug mode. */
return 0;
}
- /*
- * Forget about the parent of another subquery, but don't forget if the
- * inhTargetkind of the root is not INHKIND_NONE, which signals the root
- * contains only appendrel members. See inheritance_planner for details.
- *
- * (PG12.0) 428b260f87 added one more planning cycle for updates on
- * partitioned tables and hints set up in the cycle are overriden by the
- * second cycle. Since I didn't find no apparent distinction between the
- * PlannerRoot of the cycle and that of ordinary CMD_SELECT, pg_hint_plan
- * accepts both cycles and the later one wins. In the second cycle root
- * doesn't have inheritance information at all so use the parent_relid set
- * in the first cycle.
- */
- if (root->inhTargetKind == INHKIND_NONE)
+ if (bms_num_members(rel->top_parent_relids) == 1)
{
- 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;
- }
- }
-
- if (!l)
- {
- /*
- * This relation doesn't have a parent. Cancel
- * current_hint_state.
- */
- current_hint_state->parent_relid = 0;
- current_hint_state->parent_scan_hint = NULL;
- current_hint_state->parent_parallel_hint = NULL;
- }
+ new_parent_relid = bms_next_member(rel->top_parent_relids, -1);
+ current_hint_state->current_root = root;
+ Assert(new_parent_relid > 0);
+ }
+ else
+ {
+ /* This relation doesn't have a parent. Cancel current_hint_state. */
+ current_hint_state->parent_relid = 0;
+ current_hint_state->parent_scan_hint = NULL;
+ current_hint_state->parent_parallel_hint = NULL;
}
if (new_parent_relid > 0)
}
/*
- * 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 in order not to copy other static
- * functions not required here.
- */
-static void
-set_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
- Index rti, RangeTblEntry *rte)
-{
- if (IS_DUMMY_REL(rel))
- {
- /* We already proved the relation empty, so nothing more to do */
- }
- else if (rte->inh)
- {
- /* It's an "append relation", process accordingly */
- set_append_rel_pathlist(root, rel, rti, rte);
- }
- else
- {
- if (rel->rtekind == RTE_RELATION)
- {
- if (rte->relkind == RELKIND_RELATION)
- {
- if(rte->tablesample != NULL)
- elog(ERROR, "sampled relation is not supported");
-
- /* Plain relation */
- set_plain_rel_pathlist(root, rel, rte);
- }
- else
- elog(ERROR, "unexpected relkind: %c", rte->relkind);
- }
- else
- elog(ERROR, "unexpected rtekind: %d", (int) rel->rtekind);
- }
-
- /*
- * Allow a plugin to editorialize on the set of Paths for this base
- * relation. It could add new paths (such as CustomPaths) by calling
- * add_path(), or delete or modify paths added by the core code.
- */
- if (set_rel_pathlist_hook)
- (*set_rel_pathlist_hook) (root, rel, rti, rte);
-
- /* Now find the cheapest of the paths for this rel */
- set_cheapest(rel);
-}
-
-/*
* 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
plpgsql_recurse_level = 0;
}
+
+/* include core static functions */
+static void populate_joinrel_with_paths(PlannerInfo *root, RelOptInfo *rel1,
+ RelOptInfo *rel2, RelOptInfo *joinrel,
+ SpecialJoinInfo *sjinfo, List *restrictlist);
+static void set_append_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
+ Index rti, RangeTblEntry *rte);
+
#define standard_join_search pg_hint_plan_standard_join_search
#define join_search_one_level pg_hint_plan_join_search_one_level
#define make_join_rel make_join_rel_wrapper
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