#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
+#include "nodes/params.h"
#include "optimizer/clauses.h"
#include "optimizer/cost.h"
#include "optimizer/geqo.h"
#include "optimizer/planner.h"
#include "optimizer/prep.h"
#include "optimizer/restrictinfo.h"
+#include "parser/analyze.h"
#include "parser/scansup.h"
#include "tcop/utility.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/rel.h"
+#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "utils/resowner.h"
#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))
+ do { \
+ ereport(pg_hint_plan_message_level, \
+ (errmsg("pg_hint_plan%s: hint syntax error at or near \"%s\"", qnostr, (str)), \
+ errdetail detail)); \
+ msgqno = qno; \
+ } while(0)
#define skip_space(str) \
while (isspace(*str)) \
(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;
/* common data for all hints. */
struct Hint
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 PlannedStmt *pg_hint_plan_planner(Query *parse, int cursorOptions,
ParamListInfo boundParams);
static void pg_hint_plan_get_relation_info(PlannerInfo *root,
/* 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 hint_inhibit_level = 0; /* Inhibit hinting if this is above 0 */
/* (This could not be above 1) */
};
/* 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;
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;
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;
appendStringInfoChar(&buf, '}');
ereport(pg_hint_plan_message_level,
- (errhidestmt(true),
- errmsg("%s", buf.data)));
+ (errmsg("%s", buf.data),
+ errhidestmt(true),
+ errhidecontext(true)));
pfree(buf.data);
}
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 the current hint
+ * string is still valid.
*/
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)
- {
- /*
- * This is quite ugly but this is the only point I could find where
- * we can get the query string.
- */
- p = (char*)error_context_stack->arg;
- }
- else if (stmt_name)
+ if (jumblequery != NULL)
+ *jumblequery = query;
+
+ Assert(plpgsql_recurse_level == 0);
+
+ if (query->commandType == CMD_UTILITY)
{
- PreparedStatement *entry;
+ Query *target_query = query;
+
+ /* Use the target query if EXPLAIN */
+ if (IsA(query->utilityStmt, ExplainStmt))
+ {
+ ExplainStmt *stmt = (ExplainStmt *)(query->utilityStmt);
+ Assert(IsA(stmt->query, Query));
+ target_query = (Query *)stmt->query;
+
+ if (target_query->commandType == CMD_UTILITY &&
+ target_query->utilityStmt != NULL)
+ target_query = (Query *)target_query->utilityStmt;
+
+ if (jumblequery)
+ *jumblequery = target_query;
+ }
+
+ if (IsA(target_query, CreateTableAsStmt))
+ {
+ /*
+ * Use the the body query for CREATE AS. The Query for jumble also
+ * replaced with the corresponding one.
+ */
+ CreateTableAsStmt *stmt = (CreateTableAsStmt *) target_query;
+ PreparedStatement *entry;
+ Query *ent_query;
+
+ Assert(IsA(stmt->query, Query));
+ target_query = (Query *) stmt->query;
- entry = FetchPreparedStatement(stmt_name, true);
- p = entry->plansource->query_string;
+ if (target_query->commandType == CMD_UTILITY &&
+ IsA(target_query->utilityStmt, ExecuteStmt))
+ {
+ ExecuteStmt *estmt = (ExecuteStmt *) target_query->utilityStmt;
+ entry = FetchPreparedStatement(estmt->name, true);
+ p = entry->plansource->query_string;
+ ent_query = (Query *) linitial (entry->plansource->query_list);
+ Assert(IsA(ent_query, Query));
+ if (jumblequery)
+ *jumblequery = ent_query;
+ }
+ }
+ else
+ 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;
+ Query *ent_query;
+
+ entry = FetchPreparedStatement(stmt->name, true);
+ p = entry->plansource->query_string;
+ ent_query = (Query *) linitial (entry->plansource->query_list);
+ Assert(IsA(ent_query, Query));
+ if (jumblequery)
+ *jumblequery = ent_query;
+ }
}
- else
- p = debug_query_string;
+ /* Return NULL if the pstate is not identical to the top-level query */
+ else if (strcmp(pstate->p_sourcetext, p) != 0)
+ p = NULL;
return p;
}
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();
}
/*
- * pg_hint_plan hook functions
- */
-
-static void
-pg_hint_plan_ProcessUtility(Node *parsetree, const char *queryString,
- ProcessUtilityContext context,
- ParamListInfo params,
- DestReceiver *dest, char *completionTag)
-{
- 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;
-
- Assert(IsA(stmt->query, Query));
- query = (Query *) stmt->query;
-
- if (query->commandType == CMD_UTILITY && query->utilityStmt != NULL)
- node = query->utilityStmt;
- }
-
- /*
- * If the query was a EXECUTE or CREATE TABLE AS EXECUTE, get query string
- * specified to preceding PREPARE command to use it as source of hints.
- */
- if (IsA(node, ExecuteStmt))
- {
- ExecuteStmt *stmt;
-
- stmt = (ExecuteStmt *) node;
- stmt_name = stmt->name;
- }
-
- /*
- * CREATE AS EXECUTE behavior has changed since 9.2, so we must handle it
- * specially here.
- */
- if (IsA(node, CreateTableAsStmt))
- {
- CreateTableAsStmt *stmt;
- Query *query;
-
- stmt = (CreateTableAsStmt *) node;
- Assert(IsA(stmt->query, Query));
- query = (Query *) stmt->query;
-
- if (query->commandType == CMD_UTILITY &&
- IsA(query->utilityStmt, ExecuteStmt))
- {
- ExecuteStmt *estmt = (ExecuteStmt *) query->utilityStmt;
- stmt_name = estmt->name;
- }
- }
-
- if (stmt_name)
- {
- if (debug_level > 1)
- ereport(pg_hint_plan_message_level,
- (errmsg ("pg_hint_plan: ProcessUtility:"
- " stmt_name = \"%s\", statement=\"%s\"",
- stmt_name, queryString)));
-
- PG_TRY();
- {
- if (prev_ProcessUtility)
- (*prev_ProcessUtility) (parsetree, queryString,
- context, params,
- dest, completionTag);
- else
- standard_ProcessUtility(parsetree, queryString,
- context, params,
- dest, completionTag);
- }
- PG_CATCH();
- {
- stmt_name = NULL;
- PG_RE_THROW();
- }
- PG_END_TRY();
-
- stmt_name = NULL;
-
- return;
- }
-
- if (prev_ProcessUtility)
- (*prev_ProcessUtility) (parsetree, queryString,
- context, params,
- dest, completionTag);
- else
- standard_ProcessUtility(parsetree, queryString,
- context, params,
- dest, completionTag);
-}
-
-/*
* Push a hint into hint stack which is implemented with List struct. Head of
* list is top of stack.
*/
current_hint = (HintState *) lfirst(list_head(HintStateStack));
}
+/*
+ * Retrieve and store a hint string from given query or from the hint table.
+ * If we are using the hint table, the query string is needed to be normalized.
+ * However, ParseState, which is not available in planner_hook, is required to
+ * check if the query tree (Query) is surely corresponding to the target query.
+ */
+static void
+pg_hint_plan_post_parse_analyze(ParseState *pstate, Query *query)
+{
+ const char *query_str;
+ MemoryContext oldcontext;
+
+ if (prev_post_parse_analyze_hook)
+ prev_post_parse_analyze_hook(pstate, query);
+
+ /* do nothing under hint table search */
+ if (hint_inhibit_level > 0)
+ return;
+
+ if (!pg_hint_plan_enable_hint)
+ {
+ if (current_hint_str)
+ {
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
+ }
+ return;
+ }
+
+ /* 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)
+ {
+ 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;
+
+ /* clear the previous hint string */
+ if (current_hint_str)
+ {
+ pfree((void *)current_hint_str);
+ current_hint_str = NULL;
+ }
+
+ if (jumblequery)
+ {
+ /*
+ * XXX: normalizing code is copied from pg_stat_statements.c, so be
+ * careful to 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, 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_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_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_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*/
+ 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 just retrieving hints is expected
+ * to be faster than checking for identicalness before retrieval.
+ */
+ if (current_hint_str)
+ pfree((void *)current_hint_str);
+
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+ current_hint_str = get_hints_from_comment(query_str);
+ MemoryContextSwitchTo(oldcontext);
+ }
+
+ if (debug_level > 1)
+ {
+ if (debug_level == 1 &&
+ (stmt_name || strcmp(query_str, debug_query_string)))
+ ereport(pg_hint_plan_message_level,
+ (errmsg("hints in comment=\"%s\"",
+ current_hint_str ? current_hint_str : "(none)"),
+ errhidestmt(msgqno != qno),
+ errhidecontext(msgqno != qno)));
+ else
+ ereport(pg_hint_plan_message_level,
+ (errmsg("hints in comment=\"%s\", stmt=\"%s\", query=\"%s\", debug_query_string=\"%s\"",
+ current_hint_str ? current_hint_str : "(none)",
+ stmt_name, query_str, debug_query_string),
+ errhidestmt(msgqno != qno),
+ errhidecontext(msgqno != qno)));
+ msgqno = qno;
+ }
+}
+
+/*
+ * 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;
/*
* 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_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);
- }
+ if (current_hint_str)
+ pfree((void *)current_hint_str);
+
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+ current_hint_str =
+ get_hints_from_comment((char *)error_context_stack->arg);
+ MemoryContextSwitchTo(oldcontext);
}
- hstate = create_hintstate(parse, hints);
+ if (!current_hint_str)
+ goto standard_planner_proc;
- /*
- * Use standard planner if the statement has not valid hint. Other hook
- * functions try to change plan with current_hint if any, so set it to
- * NULL.
- */
+ /* 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.
*/
if (debug_level > 1)
{
ereport(pg_hint_plan_message_level,
- (errhidestmt(hidestmt),
- errmsg("pg_hint_plan%s: planner: %s",
- qnostr, msgstr)));
- hidestmt = true;
+ (errhidestmt(msgqno != qno),
+ errmsg("pg_hint_plan%s: planner", qnostr)));
+ msgqno = qno;
}
/*
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;
+ (errhidestmt(msgqno != qno),
+ errmsg("pg_hint_plan%s: planner: no valid hint",
+ qnostr)));
+ msgqno = qno;
}
current_hint = NULL;
if (prev_planner)
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