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Include a pointer to the query's source text in QueryDesc structs. This is

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practically free given prior 8.4 changes in plancache and portal management,
and it makes it a lot easier for ExecutorStart/Run/End hooks to get at the
query text.  Extracted from Itagaki Takahiro's pg_stat_statements patch,
with minor editorialization.
This commit is contained in:
Tom Lane
2009-01-02 20:42:00 +00:00
parent ccd31eb861
commit bbeb0bbf6b
8 changed files with 45 additions and 18 deletions
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13
src/backend/commands/prepare.c
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@ -10,7 +10,7 @@
* Copyright (c) 2002-2009, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.95 2009/01/01 17:23:39 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.96 2009/01/02 20:42:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -636,6 +636,9 @@ DropAllPreparedStatements(void)
/*
* Implements the 'EXPLAIN EXECUTE' utility statement.
*
* Note: the passed-in queryString is that of the EXPLAIN EXECUTE,
* not the original PREPARE; we get the latter string from the plancache.
*/
void
ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
@ -643,6 +646,7 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
ParamListInfo params, TupOutputState *tstate)
{
PreparedStatement *entry;
const char *query_string;
CachedPlan *cplan;
List *plan_list;
ListCell *p;
@ -659,6 +663,8 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
if (!entry->plansource->fixed_result)
elog(ERROR, "EXPLAIN EXECUTE does not support variable-result cached plans");
query_string = entry->plansource->query_string;
/* Replan if needed, and acquire a transient refcount */
cplan = RevalidateCachedPlan(entry->plansource, true);
@ -701,11 +707,12 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
pstmt->intoClause = execstmt->into;
}
ExplainOnePlan(pstmt, paramLI, stmt, tstate);
ExplainOnePlan(pstmt, stmt, query_string,
paramLI, tstate);
}
else
{
ExplainOneUtility((Node *) pstmt, stmt, queryString,
ExplainOneUtility((Node *) pstmt, stmt, query_string,
params, tstate);
}