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Fix bug in brin_minmax_multi_union

Tomas Vondra <tomas.vondra@postgresql.org>

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Commit: d9c5b9a9eeb9e3061ae139e0e564ce5358c94001
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2021-04-04T17:36:12Z
Releases: 14.0 
Fix bug in brin_minmax_multi_union

When calling sort_expanded_ranges() we need to remember the return
value, because the function sorts and also deduplicates the ranges. So
the number of ranges may decrease. brin_minmax_multi_union failed to do
that, which resulted in crashes due to bogus ranges (equal minval/maxval
but not marked as compacted).

Reported-by: Jaime Casanova
Discussion: https://postgr.es/m/20210404052550.GA4376%40ahch-to

Files

PathChange+/−
src/backend/access/brin/brin_minmax_multi.c modified +1 −1

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