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Avoid reference to nonexistent array element in ExecInitAgg().

When considering an empty grouping set, we fetchedphasedata->eqfunctions[-1]. Because the eqfunctions array ispalloc'd, that would always be an aset pointer in released versions,and thus the code accidentally failed to malfunction (since it woulddo nothing unless it found a null pointer). Nonetheless this seemslike trouble waiting to happen, so add a check for length == 0.It's depressing that our valgrind testing did not catch this.Maybe we should reconsider the choice to not mark that word NOACCESS?Richard GuoDiscussion:https://postgr.es/m/CAMbWs4-vZuuPOZsKOYnSAaPYGKhmacxhki+vpOKk0O7rymccXQ@mail.gmail.com

1 parent5a93c8f commit039567eCopy full SHA for 039567e

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src/backend/executor
- nodeAgg.c

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`‎src/backend/executor/nodeAgg.c`

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Original file line number	Diff line number	Diff line change
`@@ -2409,6 +2409,11 @@ ExecInitAgg(Agg node, EState estate, int eflags)`
`2409`	`2409`	`{`
`2410`	`2410`	`intlength=phasedata->gset_lengths[i];`
`2411`	`2411`
	`2412`	`+/* nothing to do for empty grouping set */`
	`2413`	`+if (length==0)`
	`2414`	`+continue;`
	`2415`	`+`
	`2416`	`+/* if we already had one of this length, it'll do */`
`2412`	`2417`	`if (phasedata->eqfunctions[length-1]!=NULL)`
`2413`	`2418`	`continue;`
`2414`	`2419`

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Commit039567e

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`‎src/backend/executor/nodeAgg.c`

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