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Commite416830

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Prevent auto_explain from changing the output of a user's EXPLAIN.
Commitaf7914c, which introduced theEXPLAIN (TIMING) option, for some reason coded explain.c to look atplanstate->instrument->need_timer rather than es->timing to decidewhether to print timing info. However, the former flag might get setas a result of contrib/auto_explain wanting timing information. Wecertainly don't want activation of auto_explain to change user-visiblestatement behavior, so fix that.Also fix an independent bug introduced in the same patch: in the codepath for a never-executed node with a machine-friendly output format,if timing was selected, it would fail to print the Actual Rows and ActualLoops items.Per bug #10404 from Tomonari Katsumata. Back-patch to 9.2 where thefaulty code was introduced.
1 parenta0841ec commite416830

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+16
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lines changed

1 file changed

+16
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‎src/backend/commands/explain.c

Lines changed: 16 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -1184,11 +1184,18 @@ ExplainNode(PlanState *planstate, List *ancestors,
11841184
/*
11851185
* We have to forcibly clean up the instrumentation state because we
11861186
* haven't done ExecutorEnd yet. This is pretty grotty ...
1187+
*
1188+
* Note: contrib/auto_explain could cause instrumentation to be set up
1189+
* even though we didn't ask for it here. Be careful not to print any
1190+
* instrumentation results the user didn't ask for. But we do the
1191+
* InstrEndLoop call anyway, if possible, to reduce the number of cases
1192+
* auto_explain has to contend with.
11871193
*/
11881194
if (planstate->instrument)
11891195
InstrEndLoop(planstate->instrument);
11901196

1191-
if (planstate->instrument&&planstate->instrument->nloops>0)
1197+
if (es->analyze&&
1198+
planstate->instrument&&planstate->instrument->nloops>0)
11921199
{
11931200
doublenloops=planstate->instrument->nloops;
11941201
doublestartup_sec=1000.0*planstate->instrument->startup /nloops;
@@ -1197,7 +1204,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
11971204

11981205
if (es->format==EXPLAIN_FORMAT_TEXT)
11991206
{
1200-
if (planstate->instrument->need_timer)
1207+
if (es->timing)
12011208
appendStringInfo(es->str,
12021209
" (actual time=%.3f..%.3f rows=%.0f loops=%.0f)",
12031210
startup_sec,total_sec,rows,nloops);
@@ -1208,7 +1215,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
12081215
}
12091216
else
12101217
{
1211-
if (planstate->instrument->need_timer)
1218+
if (es->timing)
12121219
{
12131220
ExplainPropertyFloat("Actual Startup Time",startup_sec,3,es);
12141221
ExplainPropertyFloat("Actual Total Time",total_sec,3,es);
@@ -1219,20 +1226,18 @@ ExplainNode(PlanState *planstate, List *ancestors,
12191226
}
12201227
elseif (es->analyze)
12211228
{
1222-
12231229
if (es->format==EXPLAIN_FORMAT_TEXT)
12241230
appendStringInfoString(es->str," (never executed)");
1225-
elseif (planstate->instrument->need_timer)
1226-
{
1227-
ExplainPropertyFloat("Actual Startup Time",0.0,3,es);
1228-
ExplainPropertyFloat("Actual Total Time",0.0,3,es);
1229-
}
12301231
else
12311232
{
1233+
if (es->timing)
1234+
{
1235+
ExplainPropertyFloat("Actual Startup Time",0.0,3,es);
1236+
ExplainPropertyFloat("Actual Total Time",0.0,3,es);
1237+
}
12321238
ExplainPropertyFloat("Actual Rows",0.0,0,es);
12331239
ExplainPropertyFloat("Actual Loops",0.0,0,es);
12341240
}
1235-
12361241
}
12371242

12381243
/* in text format, first line ends here */
@@ -1426,7 +1431,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
14261431
}
14271432

14281433
/* Show buffer usage */
1429-
if (es->buffers)
1434+
if (es->buffers&&planstate->instrument)
14301435
{
14311436
constBufferUsage*usage=&planstate->instrument->bufusage;
14321437

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