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Create crosstype comparison operators for date vs. timestamp and date

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vs. timestamptz.  This allows use of indexes for expressions like
  datecol >= date 'today' - interval '1 month'
which were formerly not indexable without casting the righthand side
down from timestamp to date.
This commit is contained in:
Tom Lane
2004-02-14 20:16:18 +00:00
parent 2e5fe483a3
commit a9e08392dd
9 changed files with 601 additions and 100 deletions
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20
src/backend/utils/adt/timestamp.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.98 2003/12/25 03:36:23 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.99 2004/02/14 20:16:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1296,7 +1296,7 @@ SetEpochTimestamp(void)
*
* collate invalid timestamp at the end
*/
static int
int
timestamp_cmp_internal(Timestamp dt1, Timestamp dt2)
{
#ifdef HAVE_INT64_TIMESTAMP
@ -1703,7 +1703,7 @@ timestamp_mi(PG_FUNCTION_ARGS)
}
/* timestamp_pl_span()
/* timestamp_pl_interval()
* Add a interval to a timestamp data type.
* Note that interval has provisions for qualitative year/month
* units, so try to do the right thing with them.
@ -1713,7 +1713,7 @@ timestamp_mi(PG_FUNCTION_ARGS)
* Lastly, add in the "quantitative time".
*/
Datum
timestamp_pl_span(PG_FUNCTION_ARGS)
timestamp_pl_interval(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
Interval *span = PG_GETARG_INTERVAL_P(1);
@ -1764,7 +1764,7 @@ timestamp_pl_span(PG_FUNCTION_ARGS)
}
Datum
timestamp_mi_span(PG_FUNCTION_ARGS)
timestamp_mi_interval(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
Interval *span = PG_GETARG_INTERVAL_P(1);
@ -1773,13 +1773,13 @@ timestamp_mi_span(PG_FUNCTION_ARGS)
tspan.month = -span->month;
tspan.time = -span->time;
return DirectFunctionCall2(timestamp_pl_span,
return DirectFunctionCall2(timestamp_pl_interval,
TimestampGetDatum(timestamp),
PointerGetDatum(&tspan));
}
/* timestamptz_pl_span()
/* timestamptz_pl_interval()
* Add a interval to a timestamp with time zone data type.
* Note that interval has provisions for qualitative year/month
* units, so try to do the right thing with them.
@ -1789,7 +1789,7 @@ timestamp_mi_span(PG_FUNCTION_ARGS)
* Lastly, add in the "quantitative time".
*/
Datum
timestamptz_pl_span(PG_FUNCTION_ARGS)
timestamptz_pl_interval(PG_FUNCTION_ARGS)
{
TimestampTz timestamp = PG_GETARG_TIMESTAMPTZ(0);
Interval *span = PG_GETARG_INTERVAL_P(1);
@ -1844,7 +1844,7 @@ timestamptz_pl_span(PG_FUNCTION_ARGS)
}
Datum
timestamptz_mi_span(PG_FUNCTION_ARGS)
timestamptz_mi_interval(PG_FUNCTION_ARGS)
{
TimestampTz timestamp = PG_GETARG_TIMESTAMPTZ(0);
Interval *span = PG_GETARG_INTERVAL_P(1);
@ -1853,7 +1853,7 @@ timestamptz_mi_span(PG_FUNCTION_ARGS)
tspan.month = -span->month;
tspan.time = -span->time;
return DirectFunctionCall2(timestamptz_pl_span,
return DirectFunctionCall2(timestamptz_pl_interval,
TimestampGetDatum(timestamp),
PointerGetDatum(&tspan));
}