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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
`@@ -738,6 +738,8 @@ compute_index_stats(Relation onerel, double totalrows,`
`738`	`738`	`{`
`739`	`739`	`HeapTupleheapTuple=rows[rowno];`
`740`	`740`
	`741`	`+vacuum_delay_point();`
	`742`	`+`
`741`	`743`	`/*`
`742`	`744`	`* Reset the per-tuple context each time, to reclaim any cruft`
`743`	`745`	`* left behind by evaluating the predicate or index expressions.`

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Commitd12afe1

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`‎src/backend/commands/analyze.c`

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