Revert due to Tom's concerns:

Add ProcessUtility_hook() to handle all DDL to
contrib/pg_stat_statements.

contrib/pg_stat_statements/pg_stat_statements.c

@@ -14,7 +14,7 @@
  * Copyright (c) 2008-2009, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/contrib/pg_stat_statements/pg_stat_statements.c,v 1.6 2009/12/01 01:08:45 momjian Exp $
+ *	  $PostgreSQL: pgsql/contrib/pg_stat_statements/pg_stat_statements.c,v 1.7 2009/12/01 02:31:11 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -24,7 +24,6 @@
 
 #include "access/hash.h"
 #include "catalog/pg_type.h"
-#include "commands/copy.h"
 #include "executor/executor.h"
 #include "executor/instrument.h"
 #include "mb/pg_wchar.h"
@@ -33,7 +32,6 @@
 #include "storage/fd.h"
 #include "storage/ipc.h"
 #include "storage/spin.h"
-#include "tcop/utility.h"
 #include "utils/builtins.h"
 #include "utils/hsearch.h"
 #include "utils/guc.h"
@@ -115,7 +113,6 @@ static shmem_startup_hook_type prev_shmem_startup_hook = NULL;
 static ExecutorStart_hook_type prev_ExecutorStart = NULL;
 static ExecutorRun_hook_type prev_ExecutorRun = NULL;
 static ExecutorEnd_hook_type prev_ExecutorEnd = NULL;
-static ProcessUtility_hook_type prev_ProcessUtility = NULL;
 
 /* Links to shared memory state */
 static pgssSharedState *pgss = NULL;
@@ -127,11 +124,10 @@ typedef enum
 {
 	PGSS_TRACK_NONE,			/* track no statements */
 	PGSS_TRACK_TOP,				/* only top level statements */
-	PGSS_TRACK_ALL				/* all statements, including nested ones */
+	PGSS_TRACK_ALL,				/* all statements, including nested ones */
 } PGSSTrackLevel;
 
-static const struct config_enum_entry track_options[] =
-{
+static const struct config_enum_entry track_options[] = {
 	{"none", PGSS_TRACK_NONE, false},
 	{"top", PGSS_TRACK_TOP, false},
 	{"all", PGSS_TRACK_ALL, false},
@@ -140,7 +136,6 @@ static const struct config_enum_entry track_options[] =
 
 static int	pgss_max;			/* max # statements to track */
 static int	pgss_track;			/* tracking level */
-static bool pgss_track_ddl;		/* whether to track ddl commands */
 static bool pgss_save;			/* whether to save stats across shutdown */
 
 
@@ -151,9 +146,7 @@ static bool pgss_save;			/* whether to save stats across shutdown */
 /*---- Function declarations ----*/
 
 void		_PG_init(void);
-#ifdef NOT_USED
 void		_PG_fini(void);
-#endif
 
 Datum		pg_stat_statements_reset(PG_FUNCTION_ARGS);
 Datum		pg_stat_statements(PG_FUNCTION_ARGS);
@@ -168,12 +161,10 @@ static void pgss_ExecutorRun(QueryDesc *queryDesc,
 				 ScanDirection direction,
 				 long count);
 static void pgss_ExecutorEnd(QueryDesc *queryDesc);
-static void pgss_ProcessUtility(Node *parsetree,
-			   const char *queryString, ParamListInfo params, bool isTopLevel,
-			   DestReceiver *dest, char *completionTag);
 static uint32 pgss_hash_fn(const void *key, Size keysize);
 static int	pgss_match_fn(const void *key1, const void *key2, Size keysize);
-static void pgss_store(const char *query, double total_time, uint64 rows);
+static void pgss_store(const char *query,
+		   const Instrumentation *instr, uint32 rows);
 static Size pgss_memsize(void);
 static pgssEntry *entry_alloc(pgssHashKey *key);
 static void entry_dealloc(void);
@@ -223,16 +214,6 @@ _PG_init(void)
 							 NULL,
 							 NULL);
 
-	DefineCustomBoolVariable("pg_stat_statements.track_ddl",
-			   "Selects whether DDL commands are tracked by pg_stat_statements.",
-							 NULL,
-							 &pgss_track_ddl,
-							 true,
-							 PGC_SUSET,
-							 0,
-							 NULL,
-							 NULL);
-
 	DefineCustomBoolVariable("pg_stat_statements.save",
 			   "Save pg_stat_statements statistics across server shutdowns.",
 							 NULL,
@@ -264,11 +245,8 @@ _PG_init(void)
 	ExecutorRun_hook = pgss_ExecutorRun;
 	prev_ExecutorEnd = ExecutorEnd_hook;
 	ExecutorEnd_hook = pgss_ExecutorEnd;
-	prev_ProcessUtility = ProcessUtility_hook;
-	ProcessUtility_hook = pgss_ProcessUtility;
 }
 
-#ifdef NOT_USED
 /*
  * Module unload callback
  */
@@ -279,10 +257,8 @@ _PG_fini(void)
 	ExecutorStart_hook = prev_ExecutorStart;
 	ExecutorRun_hook = prev_ExecutorRun;
 	ExecutorEnd_hook = prev_ExecutorEnd;
-	ProcessUtility_hook = prev_ProcessUtility;
 	shmem_startup_hook = prev_shmem_startup_hook;
 }
-#endif
 
 /*
  * shmem_startup hook: allocate or attach to shared memory,
@@ -563,7 +539,7 @@ pgss_ExecutorEnd(QueryDesc *queryDesc)
 		InstrEndLoop(queryDesc->totaltime);
 
 		pgss_store(queryDesc->sourceText,
-				   queryDesc->totaltime->total,
+				   queryDesc->totaltime,
 				   queryDesc->estate->es_processed);
 	}
 
@@ -573,59 +549,6 @@ pgss_ExecutorEnd(QueryDesc *queryDesc)
 		standard_ExecutorEnd(queryDesc);
 }
 
-/*
- * ProcessUtility hook
- */
-static void
-pgss_ProcessUtility(Node *parsetree, const char *queryString,
-					ParamListInfo params, bool isTopLevel,
-					DestReceiver *dest, char *completionTag)
-{
-	if (pgss_track_ddl && isTopLevel && pgss_enabled())
-	{
-		instr_time	start;
-		instr_time	duration;
-		uint64		rows = 0;
-
-		INSTR_TIME_SET_CURRENT(start);
-
-		nested_level++;
-		PG_TRY();
-		{
-			if (prev_ProcessUtility)
-				prev_ProcessUtility(parsetree, queryString, params, isTopLevel, dest, completionTag);
-			else if ((nodeTag(parsetree)) == T_CopyStmt)
-			{
-				rows = DoCopy((CopyStmt *) parsetree, queryString);
-				if (completionTag)
-					snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
-							 "COPY " UINT64_FORMAT, rows);
-			}
-			else
-				standard_ProcessUtility(parsetree, queryString, params, isTopLevel, dest, completionTag);
-			nested_level--;
-		}
-		PG_CATCH();
-		{
-			nested_level--;
-			PG_RE_THROW();
-		}
-		PG_END_TRY();
-
-		INSTR_TIME_SET_CURRENT(duration);
-		INSTR_TIME_SUBTRACT(duration, start);
-
-		pgss_store(queryString, INSTR_TIME_GET_DOUBLE(duration), rows);
-	}
-	else
-	{
-		if (prev_ProcessUtility)
-			prev_ProcessUtility(parsetree, queryString, params, isTopLevel, dest, completionTag);
-		else
-			standard_ProcessUtility(parsetree, queryString, params, isTopLevel, dest, completionTag);
-	}
-}
-
 /*
  * Calculate hash value for a key
  */
@@ -664,7 +587,7 @@ pgss_match_fn(const void *key1, const void *key2, Size keysize)
  * Store some statistics for a statement.
  */
 static void
-pgss_store(const char *query, double total_time, uint64 rows)
+pgss_store(const char *query, const Instrumentation *instr, uint32 rows)
 {
 	pgssHashKey key;
 	double		usage;
@@ -708,7 +631,7 @@ pgss_store(const char *query, double total_time, uint64 rows)
 
 		SpinLockAcquire(&e->mutex);
 		e->counters.calls += 1;
-		e->counters.total_time += total_time;
+		e->counters.total_time += instr->total;
 		e->counters.rows += rows;
 		e->counters.usage += usage;
 		SpinLockRelease(&e->mutex);

doc/src/sgml/pgstatstatements.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/pgstatstatements.sgml,v 1.3 2009/12/01 01:08:46 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/pgstatstatements.sgml,v 1.4 2009/12/01 02:31:11 momjian Exp $ -->
 
 <sect1 id="pgstatstatements">
  <title>pg_stat_statements</title>
@@ -174,23 +174,6 @@
     </listitem>
    </varlistentry>
 
-   <varlistentry>
-    <term>
-     <varname>pg_stat_statements.track_ddl</varname> (<type>boolean</type>)
-    </term>
-
-    <listitem>
-     <para>
-      <varname>pg_stat_statements.track_ddl</varname> controls whether DDL
-      commands are counted by the module.
-      Specify <literal>on</> to track DDL commands, which excludes <command>SELECT</>,
-      <command>INSERT</>, <command>UPDATE</> and <command>DELETE</> statements.
-      The default value is <literal>on</>.
-      Only superusers can change this setting.
-     </para>
-    </listitem>
-   </varlistentry>
-
    <varlistentry>
     <term>
      <varname>pg_stat_statements.save</varname> (<type>boolean</type>)

src/backend/tcop/utility.c

@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.319 2009/12/01 01:08:46 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.320 2009/12/01 02:31:12 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -58,9 +58,6 @@
 #include "utils/syscache.h"
 
 
-/* Hooks for plugins to get control in ProcessUtility() */
-ProcessUtility_hook_type ProcessUtility_hook = NULL;
-
 /*
  * Verify user has ownership of specified relation, else ereport.
  *
@@ -247,10 +244,6 @@ check_xact_readonly(Node *parsetree)
  * completionTag is only set nonempty if we want to return a nondefault status.
  *
  * completionTag may be NULL if caller doesn't want a status string.
- *
- * We provide a function hook variable that lets loadable plugins
- * get control when ProcessUtility is called.  Such a plugin would
- * normally call standard_ProcessUtility().
  */
 void
 ProcessUtility(Node *parsetree,
@@ -267,20 +260,6 @@ ProcessUtility(Node *parsetree,
 	if (completionTag)
 		completionTag[0] = '\0';
 
-	if (ProcessUtility_hook)
-		(*ProcessUtility_hook) (parsetree, queryString, params, isTopLevel, dest, completionTag);
-	else
-		standard_ProcessUtility(parsetree, queryString, params, isTopLevel, dest, completionTag);
-}
-
-void
-standard_ProcessUtility(Node *parsetree,
-			   const char *queryString,
-			   ParamListInfo params,
-			   bool isTopLevel,
-			   DestReceiver *dest,
-			   char *completionTag)
-{
 	switch (nodeTag(parsetree))
 	{
 			/*

src/include/tcop/utility.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/tcop/utility.h,v 1.36 2009/12/01 01:08:46 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/tcop/utility.h,v 1.37 2009/12/01 02:31:13 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -17,18 +17,9 @@
 #include "tcop/tcopprot.h"
 
 
-/* Hook for plugins to get control in ProcessUtility() */
-typedef void (*ProcessUtility_hook_type) (Node *parsetree,
-			   const char *queryString, ParamListInfo params, bool isTopLevel,
-			   DestReceiver *dest, char *completionTag);
-extern PGDLLIMPORT ProcessUtility_hook_type ProcessUtility_hook;
-
 extern void ProcessUtility(Node *parsetree, const char *queryString,
 			   ParamListInfo params, bool isTopLevel,
 			   DestReceiver *dest, char *completionTag);
-extern void standard_ProcessUtility(Node *parsetree, const char *queryString,
-			   ParamListInfo params, bool isTopLevel,
-			   DestReceiver *dest, char *completionTag);
 
 extern bool UtilityReturnsTuples(Node *parsetree);