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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2012-04-07 17:48:40 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2012-04-07 17:48:40 -0400 |
| commit | 95b9c333b25463283ba07c5ba7dbe79b4e8b4480 (patch) | |
| tree | b7d313e4c5f2de9de79d3f0a0b7c7fe91f5edb12 /src | |
| parent | a25ef7a5f68728f7f78f798a98c26b773c45937e (diff) | |
| download | postgresql-95b9c333b25463283ba07c5ba7dbe79b4e8b4480.tar.gz postgresql-95b9c333b25463283ba07c5ba7dbe79b4e8b4480.zip | |
Further adjustment of comment about qsort_tuple.
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/utils/sort/tuplesort.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c index 95489ac3f30..89698181dbf 100644 --- a/src/backend/utils/sort/tuplesort.c +++ b/src/backend/utils/sort/tuplesort.c @@ -346,7 +346,7 @@ struct Tuplesortstate /* * This variable is shared by the single-key MinimalTuple case and the - * Datum case. Otherwise it's NULL. + * Datum case (which both use qsort_ssup()). Otherwise it's NULL. */ SortSupport onlyKey; @@ -500,8 +500,11 @@ static void reversedirection_datum(Tuplesortstate *state); static void free_sort_tuple(Tuplesortstate *state, SortTuple *stup); /* - * Special versions of qsort just for SortTuple objects. We have one for the - * single-key case (qsort_ssup) and one for multi-key cases (qsort_tuple). + * Special versions of qsort just for SortTuple objects. qsort_tuple() sorts + * any variant of SortTuples, using the appropriate comparetup function. + * qsort_ssup() is specialized for the case where the comparetup function + * reduces to ApplySortComparator(), that is single-key MinimalTuple sorts + * and Datum sorts. */ #include "qsort_tuple.c" |