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Fix various typos and spelling mistakes in code comments

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Author: Justin Pryzby
Discussion: https://postgr.es/m/20220411020336.GB26620@telsasoft.com
This commit is contained in:
David Rowley
2022-04-11 20:49:41 +12:00
parent bba3c35b29
commit b0e5f02ddc
33 changed files with 46 additions and 45 deletions
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10
src/backend/optimizer/path/pathkeys.c
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@@ -2383,16 +2383,16 @@ pathkeys_useful_for_ordering(PlannerInfo *root, List *pathkeys)
* Count the number of pathkeys that are useful for grouping (instead of
* explicit sort)
*
* Group pathkeys could be reordered to benefit from the odering. The ordering
* may not be "complete" and may require incremental sort, but that's fine. So
* we simply count prefix pathkeys with a matching group key, and stop once we
* find the first pathkey without a match.
* Group pathkeys could be reordered to benefit from the ordering. The
* ordering may not be "complete" and may require incremental sort, but that's
* fine. So we simply count prefix pathkeys with a matching group key, and
* stop once we find the first pathkey without a match.
*
* So e.g. with pathkeys (a,b,c) and group keys (a,b,e) this determines (a,b)
* pathkeys are useful for grouping, and we might do incremental sort to get
* path ordered by (a,b,e).
*
* This logic is necessary to retain paths with ordeding not matching grouping
* This logic is necessary to retain paths with ordering not matching grouping
* keys directly, without the reordering.
*
* Returns the length of pathkey prefix with matching group keys.