diff options
Diffstat (limited to 'src/backend/utils/adt/timestamp.c')
| -rw-r--r-- | src/backend/utils/adt/timestamp.c | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c index d2019351168..04eaa81140d 100644 --- a/src/backend/utils/adt/timestamp.c +++ b/src/backend/utils/adt/timestamp.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.178 2007/06/15 20:56:50 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.179 2007/07/06 04:15:59 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -1839,6 +1839,17 @@ timestamp_cmp(PG_FUNCTION_ARGS) PG_RETURN_INT32(timestamp_cmp_internal(dt1, dt2)); } +Datum +timestamp_hash(PG_FUNCTION_ARGS) +{ + /* We can use either hashint8 or hashfloat8 directly */ +#ifdef HAVE_INT64_TIMESTAMP + return hashint8(fcinfo); +#else + return hashfloat8(fcinfo); +#endif +} + /* * Crosstype comparison functions for timestamp vs timestamptz @@ -2110,21 +2121,32 @@ interval_cmp(PG_FUNCTION_ARGS) PG_RETURN_INT32(interval_cmp_internal(interval1, interval2)); } -/* - * interval, being an unusual size, needs a specialized hash function. - */ Datum interval_hash(PG_FUNCTION_ARGS) { Interval *key = PG_GETARG_INTERVAL_P(0); + uint32 thash; + uint32 mhash; /* - * Specify hash length as sizeof(double) + sizeof(int4), not as - * sizeof(Interval), so that any garbage pad bytes in the structure won't - * be included in the hash! + * To avoid any problems with padding bytes in the struct, + * we figure the field hashes separately and XOR them. This also + * provides a convenient framework for dealing with the fact that + * the time field might be either double or int64. */ - return hash_any((unsigned char *) key, - sizeof(key->time) + sizeof(key->day) + sizeof(key->month)); +#ifdef HAVE_INT64_TIMESTAMP + thash = DatumGetUInt32(DirectFunctionCall1(hashint8, + Int64GetDatumFast(key->time))); +#else + thash = DatumGetUInt32(DirectFunctionCall1(hashfloat8, + Float8GetDatumFast(key->time))); +#endif + thash ^= DatumGetUInt32(hash_uint32(key->day)); + /* Shift so "k days" and "k months" don't hash to the same thing */ + mhash = DatumGetUInt32(hash_uint32(key->month)); + thash ^= mhash << 24; + thash ^= mhash >> 8; + PG_RETURN_UINT32(thash); } /* overlaps_timestamp() --- implements the SQL92 OVERLAPS operator. |