Horton

Split out tiebreaker comparisons from comparetup_* functions

John Naylor <john.naylor@postgresql.org>

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Commit: c9bfa40914be4a0882b904834c2bd32775a50d7b
Author: John Naylor <john.naylor@postgresql.org>
Date: 2023-08-16T10:15:07Z
Releases: 17.0 
Split out tiebreaker comparisons from comparetup_* functions

Previously, if a specialized comparator found equal datum1 keys,
the "comparetup" function would repeat the comparison on the
datum before proceeding with the unabbreviated first key
and/or additional sort keys.

Move comparing additional sort keys into "tiebreak" functions so
that specialized comparators can call these directly if needed,
avoiding duplicate work.

Reviewed by David Rowley

Discussion: https://postgr.es/m/CAFBsxsGaVfUrjTghpf%3DkDBYY%3DjWx1PN-fuusVe7Vw5s0XqGdGw%40mail.gmail.com

Files

PathChange+/−
src/backend/utils/sort/tuplesort.c modified +3 −6
src/backend/utils/sort/tuplesortvariants.c modified +98 −27
src/include/utils/tuplesort.h modified +7 −0

Discussion