diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/utils/tuplesort.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/include/utils/tuplesort.h b/src/include/utils/tuplesort.h index 001761796e2..a2c4f879624 100644 --- a/src/include/utils/tuplesort.h +++ b/src/include/utils/tuplesort.h @@ -13,7 +13,7 @@ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: tuplesort.h,v 1.7 2001/05/07 00:43:26 tgl Exp $ + * $Id: tuplesort.h,v 1.8 2001/06/02 19:01:52 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -22,6 +22,7 @@ #include "access/htup.h" #include "access/itup.h" +#include "fmgr.h" /* Tuplesortstate is an opaque type whose details are not known outside tuplesort.c. */ @@ -83,6 +84,7 @@ extern void tuplesort_restorepos(Tuplesortstate *state); typedef enum { SORTFUNC_LT, /* raw "<" operator */ + SORTFUNC_REVLT, /* raw "<" operator, but reverse NULLs */ SORTFUNC_CMP, /* -1 / 0 / 1 three-way comparator */ SORTFUNC_REVCMP /* 1 / 0 / -1 (reversed) 3-way comparator */ } SortFunctionKind; @@ -91,4 +93,13 @@ extern void SelectSortFunction(Oid sortOperator, RegProcedure *sortFunction, SortFunctionKind *kind); +/* + * Apply a sort function (by now converted to fmgr lookup form) + * and return a 3-way comparison result. This takes care of handling + * NULLs and sort ordering direction properly. + */ +extern int32 ApplySortFunction(FmgrInfo *sortFunction, SortFunctionKind kind, + Datum datum1, bool isNull1, + Datum datum2, bool isNull2); + #endif /* TUPLESORT_H */ |