diff options
Diffstat (limited to 'src/backend/utils/adt/tid.c')
| -rw-r--r-- | src/backend/utils/adt/tid.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/backend/utils/adt/tid.c b/src/backend/utils/adt/tid.c index 41d540b46ec..7b25947682e 100644 --- a/src/backend/utils/adt/tid.c +++ b/src/backend/utils/adt/tid.c @@ -20,6 +20,7 @@ #include <math.h> #include <limits.h> +#include "access/hash.h" #include "access/heapam.h" #include "access/sysattr.h" #include "catalog/namespace.h" @@ -239,6 +240,33 @@ tidsmaller(PG_FUNCTION_ARGS) PG_RETURN_ITEMPOINTER(ItemPointerCompare(arg1, arg2) <= 0 ? arg1 : arg2); } +Datum +hashtid(PG_FUNCTION_ARGS) +{ + ItemPointer key = PG_GETARG_ITEMPOINTER(0); + + /* + * While you'll probably have a lot of trouble with a compiler that + * insists on appending pad space to struct ItemPointerData, we can at + * least make this code work, by not using sizeof(ItemPointerData). + * Instead rely on knowing the sizes of the component fields. + */ + return hash_any((unsigned char *) key, + sizeof(BlockIdData) + sizeof(OffsetNumber)); +} + +Datum +hashtidextended(PG_FUNCTION_ARGS) +{ + ItemPointer key = PG_GETARG_ITEMPOINTER(0); + uint64 seed = PG_GETARG_INT64(1); + + /* As above */ + return hash_any_extended((unsigned char *) key, + sizeof(BlockIdData) + sizeof(OffsetNumber), + seed); +} + /* * Functions to get latest tid of a specified tuple. |