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Commit174a786

Oleg Tselebrovskiy

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Add ExecutorStart hook to track top-level queryId for prepared queries

and more precisely in general

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pg_wait_sampling.c

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`‎pg_wait_sampling.c‎`

Lines changed: 36 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -44,6 +44,7 @@ void_PG_init(void);`
`44`	`44`	`staticboolshmem_initialized= false;`
`45`	`45`
`46`	`46`	`/* Hooks */`
	`47`	`+staticExecutorStart_hook_typeprev_ExecutorStart=NULL;`
`47`	`48`	`staticExecutorEnd_hook_typeprev_ExecutorEnd=NULL;`
`48`	`49`	`staticplanner_hook_typeplanner_hook_next=NULL;`
`49`	`50`
`@@ -67,6 +68,7 @@ static PlannedStmt pgws_planner_hook(Query parse,`
`67`	`68`	`constchar*query_string,`
`68`	`69`	`#endif`
`69`	`70`	`intcursorOptions,ParamListInfoboundParams);`
	`71`	`+staticvoidpgws_ExecutorStart(QueryDesc*queryDesc,inteflags);`
`70`	`72`	`staticvoidpgws_ExecutorEnd(QueryDesc*queryDesc);`
`71`	`73`
`72`	`74`	`/*`
`@@ -402,6 +404,8 @@ _PG_init(void)`
`402`	`404`	`shmem_startup_hook=pgws_shmem_startup;`
`403`	`405`	`planner_hook_next=planner_hook;`
`404`	`406`	`planner_hook=pgws_planner_hook;`
	`407`	`+prev_ExecutorStart=ExecutorStart_hook;`
	`408`	`+ExecutorStart_hook=pgws_ExecutorStart;`
`405`	`409`	`prev_ExecutorEnd=ExecutorEnd_hook;`
`406`	`410`	`ExecutorEnd_hook=pgws_ExecutorEnd;`
`407`	`411`	`}`
`@@ -906,6 +910,38 @@ pgws_planner_hook(Query *parse,`
`906`	`910`	`cursorOptions,boundParams);`
`907`	`911`	`}`
`908`	`912`
	`913`	`+/*`
	`914`	`+ * ExecutorStart hook: save queryId for collector`
	`915`	`+ */`
	`916`	`+staticvoid`
	`917`	`+pgws_ExecutorStart(QueryDesc*queryDesc,inteflags)`
	`918`	`+{`
	`919`	`+inti;`
	`920`	`+`
	`921`	`+if (MyProc)`
	`922`	`+{`
	`923`	`+i=MyProc-ProcGlobal->allProcs;`
	`924`	`+#ifPG_VERSION_NUM >=110000`
	`925`	`+/*`
	`926`	`+ * since we depend on queryId we need to check that its size`
	`927`	`+ * is uint64 as we coded in pg_wait_sampling`
	`928`	`+ */`
	`929`	`+StaticAssertExpr(sizeof(queryDesc->plannedstmt->queryId)==sizeof(uint64),`
	`930`	`+"queryId size is not uint64");`
	`931`	`+#else`
	`932`	`+StaticAssertExpr(sizeof(queryDesc->plannedstmt->queryId)==sizeof(uint32),`
	`933`	`+"queryId size is not uint32");`
	`934`	`+#endif`
	`935`	`+if (!pgws_proc_queryids[i])`
	`936`	`+pgws_proc_queryids[i]=queryDesc->plannedstmt->queryId;`
	`937`	`+}`
	`938`	`+`
	`939`	`+if (prev_ExecutorStart)`
	`940`	`+prev_ExecutorStart(queryDesc,eflags);`
	`941`	`+else`
	`942`	`+standard_ExecutorStart(queryDesc,eflags);`
	`943`	`+}`
	`944`	`+`
`909`	`945`	`/*`
`910`	`946`	`* ExecutorEnd hook: clear queryId`
`911`	`947`	`*/`

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`‎pg_wait_sampling.c‎`

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