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(parent: 1601830) | patch

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

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 long
enough to make it worth being cancellable. Probably it would be enough
to call CHECK_FOR_INTERRUPTS here, but for consistency with other
per-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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