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Commitc00cfed

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Fix release procedure of QueryDesc object from stack
The global state variable that denotes a stack of currently executingqueries requires a special care on supporting. The mechanism of addingand removing of current stack frame in Executor hooks is kept fromauto_explain extension for nesting_level variable. The current stackframe is added to stack before ExecutorRun and ExecutorFinish routinesand is released after them
1 parent272816f commitc00cfed

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1 file changed

+19
-54
lines changed

1 file changed

+19
-54
lines changed

‎pg_query_state.c

Lines changed: 19 additions & 54 deletions
Original file line numberDiff line numberDiff line change
@@ -50,7 +50,6 @@ bool pg_qs_buffers = false;
5050
staticExecutorStart_hook_typeprev_ExecutorStart=NULL;
5151
staticExecutorRun_hook_typeprev_ExecutorRun=NULL;
5252
staticExecutorFinish_hook_typeprev_ExecutorFinish=NULL;
53-
staticExecutorEnd_hook_typeprev_ExecutorEnd=NULL;
5453
staticshmem_startup_hook_typeprev_shmem_startup_hook=NULL;
5554

5655
void_PG_init(void);
@@ -65,7 +64,6 @@ static void qs_ExecutorRun(QueryDesc *queryDesc, ScanDirection direction,
6564
uint64count,boolexecute_once);
6665
#endif
6766
staticvoidqs_ExecutorFinish(QueryDesc*queryDesc);
68-
staticvoidqs_ExecutorEnd(QueryDesc*queryDesc);
6967

7068
/* Global variables */
7169
List*QueryDescStack=NIL;
@@ -249,8 +247,6 @@ _PG_init(void)
249247
ExecutorRun_hook=qs_ExecutorRun;
250248
prev_ExecutorFinish=ExecutorFinish_hook;
251249
ExecutorFinish_hook=qs_ExecutorFinish;
252-
prev_ExecutorEnd=ExecutorEnd_hook;
253-
ExecutorEnd_hook=qs_ExecutorEnd;
254250
prev_shmem_startup_hook=shmem_startup_hook;
255251
shmem_startup_hook=pg_qs_shmem_startup;
256252
}
@@ -271,7 +267,6 @@ _PG_fini(void)
271267
ExecutorStart_hook=prev_ExecutorStart;
272268
ExecutorRun_hook=prev_ExecutorRun;
273269
ExecutorFinish_hook=prev_ExecutorFinish;
274-
ExecutorEnd_hook=prev_ExecutorEnd;
275270
shmem_startup_hook=prev_shmem_startup_hook;
276271
}
277272

@@ -283,32 +278,20 @@ _PG_fini(void)
283278
staticvoid
284279
qs_ExecutorStart(QueryDesc*queryDesc,inteflags)
285280
{
286-
PG_TRY();
281+
/* Enable per-node instrumentation */
282+
if (pg_qs_enable&& ((eflags&EXEC_FLAG_EXPLAIN_ONLY)==0))
287283
{
288-
/* Enable per-node instrumentation */
289-
if (pg_qs_enable&& ((eflags&EXEC_FLAG_EXPLAIN_ONLY)==0))
290-
{
291-
queryDesc->instrument_options |=INSTRUMENT_ROWS;
292-
if (pg_qs_timing)
293-
queryDesc->instrument_options |=INSTRUMENT_TIMER;
294-
if (pg_qs_buffers)
295-
queryDesc->instrument_options |=INSTRUMENT_BUFFERS;
296-
}
297-
298-
if (prev_ExecutorStart)
299-
prev_ExecutorStart(queryDesc,eflags);
300-
else
301-
standard_ExecutorStart(queryDesc,eflags);
302-
303-
/* push structure about current query in global stack */
304-
QueryDescStack=lcons(queryDesc,QueryDescStack);
284+
queryDesc->instrument_options |=INSTRUMENT_ROWS;
285+
if (pg_qs_timing)
286+
queryDesc->instrument_options |=INSTRUMENT_TIMER;
287+
if (pg_qs_buffers)
288+
queryDesc->instrument_options |=INSTRUMENT_BUFFERS;
305289
}
306-
PG_CATCH();
307-
{
308-
QueryDescStack=NIL;
309-
PG_RE_THROW();
310-
}
311-
PG_END_TRY();
290+
291+
if (prev_ExecutorStart)
292+
prev_ExecutorStart(queryDesc,eflags);
293+
else
294+
standard_ExecutorStart(queryDesc,eflags);
312295
}
313296

314297
/*
@@ -323,6 +306,8 @@ qs_ExecutorRun(QueryDesc *queryDesc, ScanDirection direction, uint64 count,
323306
boolexecute_once)
324307
#endif
325308
{
309+
QueryDescStack=lcons(queryDesc,QueryDescStack);
310+
326311
PG_TRY();
327312
{
328313
if (prev_ExecutorRun)
@@ -335,10 +320,11 @@ qs_ExecutorRun(QueryDesc *queryDesc, ScanDirection direction, uint64 count,
335320
else
336321
standard_ExecutorRun(queryDesc,direction,count,execute_once);
337322
#endif
323+
QueryDescStack=list_delete_first(QueryDescStack);
338324
}
339325
PG_CATCH();
340326
{
341-
QueryDescStack=NIL;
327+
QueryDescStack=list_delete_first(QueryDescStack);
342328
PG_RE_THROW();
343329
}
344330
PG_END_TRY();
@@ -351,40 +337,19 @@ qs_ExecutorRun(QueryDesc *queryDesc, ScanDirection direction, uint64 count,
351337
staticvoid
352338
qs_ExecutorFinish(QueryDesc*queryDesc)
353339
{
340+
QueryDescStack=lcons(queryDesc,QueryDescStack);
341+
354342
PG_TRY();
355343
{
356344
if (prev_ExecutorFinish)
357345
prev_ExecutorFinish(queryDesc);
358346
else
359347
standard_ExecutorFinish(queryDesc);
360-
}
361-
PG_CATCH();
362-
{
363-
QueryDescStack=NIL;
364-
PG_RE_THROW();
365-
}
366-
PG_END_TRY();
367-
}
368-
369-
/*
370-
* ExecutorEnd hook:
371-
* pop current query description from global stack
372-
*/
373-
staticvoid
374-
qs_ExecutorEnd(QueryDesc*queryDesc)
375-
{
376-
PG_TRY();
377-
{
378348
QueryDescStack=list_delete_first(QueryDescStack);
379-
380-
if (prev_ExecutorEnd)
381-
prev_ExecutorEnd(queryDesc);
382-
else
383-
standard_ExecutorEnd(queryDesc);
384349
}
385350
PG_CATCH();
386351
{
387-
QueryDescStack=NIL;
352+
QueryDescStack=list_delete_first(QueryDescStack);
388353
PG_RE_THROW();
389354
}
390355
PG_END_TRY();

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