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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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14
src/backend/tcop/pquery.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.128 2009/01/01 17:23:48 momjian Exp $
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.129 2009/01/02 20:42:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -36,6 +36,7 @@ Portal ActivePortal = NULL;
static void ProcessQuery(PlannedStmt *plan,
const char *sourceText,
ParamListInfo params,
DestReceiver *dest,
char *completionTag);
@ -61,6 +62,7 @@ static void DoPortalRewind(Portal portal);
*/
QueryDesc *
CreateQueryDesc(PlannedStmt *plannedstmt,
const char *sourceText,
Snapshot snapshot,
Snapshot crosscheck_snapshot,
DestReceiver *dest,
@ -72,6 +74,7 @@ CreateQueryDesc(PlannedStmt *plannedstmt,
qd->operation = plannedstmt->commandType; /* operation */
qd->plannedstmt = plannedstmt; /* plan */
qd->utilitystmt = plannedstmt->utilityStmt; /* in case DECLARE CURSOR */
qd->sourceText = sourceText; /* query text */
qd->snapshot = RegisterSnapshot(snapshot); /* snapshot */
/* RI check snapshot */
qd->crosscheck_snapshot = RegisterSnapshot(crosscheck_snapshot);
@ -93,6 +96,7 @@ CreateQueryDesc(PlannedStmt *plannedstmt,
*/
QueryDesc *
CreateUtilityQueryDesc(Node *utilitystmt,
const char *sourceText,
Snapshot snapshot,
DestReceiver *dest,
ParamListInfo params)
@ -102,6 +106,7 @@ CreateUtilityQueryDesc(Node *utilitystmt,
qd->operation = CMD_UTILITY; /* operation */
qd->plannedstmt = NULL;
qd->utilitystmt = utilitystmt; /* utility command */
qd->sourceText = sourceText; /* query text */
qd->snapshot = RegisterSnapshot(snapshot); /* snapshot */
qd->crosscheck_snapshot = InvalidSnapshot; /* RI check snapshot */
qd->dest = dest; /* output dest */
@ -141,6 +146,7 @@ FreeQueryDesc(QueryDesc *qdesc)
* or PORTAL_ONE_RETURNING portal
*
* plan: the plan tree for the query
* sourceText: the source text of the query
* params: any parameters needed
* dest: where to send results
* completionTag: points to a buffer of size COMPLETION_TAG_BUFSIZE
@ -153,6 +159,7 @@ FreeQueryDesc(QueryDesc *qdesc)
*/
static void
ProcessQuery(PlannedStmt *plan,
const char *sourceText,
ParamListInfo params,
DestReceiver *dest,
char *completionTag)
@ -169,7 +176,7 @@ ProcessQuery(PlannedStmt *plan,
/*
* Create the QueryDesc object
*/
queryDesc = CreateQueryDesc(plan,
queryDesc = CreateQueryDesc(plan, sourceText,
GetActiveSnapshot(), InvalidSnapshot,
dest, params, false);
@ -503,6 +510,7 @@ PortalStart(Portal portal, ParamListInfo params, Snapshot snapshot)
* the destination to DestNone.
*/
queryDesc = CreateQueryDesc((PlannedStmt *) linitial(portal->stmts),
portal->sourceText,
GetActiveSnapshot(),
InvalidSnapshot,
None_Receiver,
@ -1258,6 +1266,7 @@ PortalRunMulti(Portal portal, bool isTopLevel,
{
/* statement can set tag string */
ProcessQuery(pstmt,
portal->sourceText,
portal->portalParams,
dest, completionTag);
}
@ -1265,6 +1274,7 @@ PortalRunMulti(Portal portal, bool isTopLevel,
{
/* stmt added by rewrite cannot set tag */
ProcessQuery(pstmt,
portal->sourceText,
portal->portalParams,
altdest, NULL);
}