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Fix bug in brin_minmax_multi_union

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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
This commit is contained in:
Tomas Vondra
2021-04-04 19:36:10 +02:00
parent 4908684dda
commit d9c5b9a9ee
1 changed files with 1 additions and 1 deletions
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2
src/backend/access/brin/brin_minmax_multi.c
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@ -2794,7 +2794,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
BTLessStrategyNumber);
/* sort the expanded ranges */
sort_expanded_ranges(cmpFn, colloid, eranges, neranges);
neranges = sort_expanded_ranges(cmpFn, colloid, eranges, neranges);
/*
* We've loaded two different lists of expanded ranges, so some of them