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Add vacuum_delay_point call in compute_index_stats's per-sample-row loop.

Slow functions in index expressions might cause this loop to take longenough to make it worth being cancellable. Probably it would be enoughto call CHECK_FOR_INTERRUPTS here, but for consistency with otherper-sample-row loops in this file, let's use vacuum_delay_point.Report and patch by Jeff Janes. Back-patch to all supported branches.

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src/backend/commands
- analyze.c

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`‎src/backend/commands/analyze.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -742,6 +742,8 @@ compute_index_stats(Relation onerel, double totalrows,`
`742`	`742`	`{`
`743`	`743`	`HeapTupleheapTuple=rows[rowno];`
`744`	`744`
	`745`	`+vacuum_delay_point();`
	`746`	`+`
`745`	`747`	`/*`
`746`	`748`	`* Reset the per-tuple context each time, to reclaim any cruft`
`747`	`749`	`* left behind by evaluating the predicate or index expressions.`

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Commite4cbfd6

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`‎src/backend/commands/analyze.c‎`

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