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Implement precision support for timestamp and time, both with and without

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time zones.
SQL99 spec requires a default of zero (round to seconds) which is set
 in gram.y as typmod is set in the parse tree. We *could* change to a
 default of either 6 (for internal compatibility with previous versions)
 or 2 (for external compatibility with previous versions).
Evaluate entries in pg_proc wrt the iscachable attribute for timestamp and
 other date/time types. Try to recognize cases where side effects like the
 current time zone setting may have an effect on results to decide whether
 something is cachable or not.
This commit is contained in:
Thomas G. Lockhart
2001-10-03 05:29:27 +00:00
parent a51de40fb6
commit 3e1beda2cd
22 changed files with 946 additions and 942 deletions
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113
src/backend/utils/adt/date.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.58 2001/09/28 08:09:10 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.59 2001/10/03 05:29:24 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -28,6 +28,9 @@
#include "utils/timestamp.h"
static void
AdjustTimeForTypmod(TimeADT *time, int32 typmod);
/*****************************************************************************
* Date ADT
*****************************************************************************/
@@ -425,7 +428,11 @@ Datum
time_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
TimeADT time;
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
#endif
int32 typmod = PG_GETARG_INT32(2);
TimeADT result;
double fsec;
struct tm tt,
*tm = &tt;
@@ -439,9 +446,11 @@ time_in(PG_FUNCTION_ARGS)
|| (DecodeTimeOnly(field, ftype, nf, &dtype, tm, &fsec, NULL) != 0))
elog(ERROR, "Bad time external representation '%s'", str);
time = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
result = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
PG_RETURN_TIMEADT(time);
AdjustTimeForTypmod(&result, typmod);
PG_RETURN_TIMEADT(result);
}
Datum
@@ -452,13 +461,14 @@ time_out(PG_FUNCTION_ARGS)
struct tm tt,
*tm = &tt;
double fsec;
double trem;
char buf[MAXDATELEN + 1];
tm->tm_hour = (time / (60 * 60));
tm->tm_min = (((int) (time / 60)) % 60);
tm->tm_sec = (((int) time) % 60);
fsec = 0;
trem = time;
TMODULO(trem, tm->tm_hour, 3600e0);
TMODULO(trem, tm->tm_min, 60e0);
TMODULO(trem, tm->tm_sec, 1e0);
fsec = trem;
EncodeTimeOnly(tm, fsec, NULL, DateStyle, buf);
@@ -466,6 +476,43 @@ time_out(PG_FUNCTION_ARGS)
PG_RETURN_CSTRING(result);
}
/* time_scale()
* Adjust time type for specified scale factor.
* Used by PostgreSQL type system to stuff columns.
*/
Datum
time_scale(PG_FUNCTION_ARGS)
{
TimeADT time = PG_GETARG_TIMEADT(0);
int32 typmod = PG_GETARG_INT32(1);
TimeADT result;
result = time;
AdjustTimeForTypmod(&result, typmod);
PG_RETURN_TIMEADT(result);
}
static void
AdjustTimeForTypmod(TimeADT *time, int32 typmod)
{
if ((typmod >= 0) && (typmod <= 13))
{
static double TimeScale = 1;
static int32 TimeTypmod = 0;
if (typmod != TimeTypmod)
TimeScale = pow(10, typmod);
*time = (rint(((double) *time)*TimeScale)/TimeScale);
if (*time >= 86400)
*time -= 86400;
}
return;
}
Datum
time_eq(PG_FUNCTION_ARGS)
@@ -882,12 +929,15 @@ text_time(PG_FUNCTION_ARGS)
* Time With Time Zone ADT
*****************************************************************************/
Datum
timetz_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
TimeTzADT *time;
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
#endif
int32 typmod = PG_GETARG_INT32(2);
TimeTzADT *result;
double fsec;
struct tm tt,
*tm = &tt;
@@ -902,12 +952,14 @@ timetz_in(PG_FUNCTION_ARGS)
|| (DecodeTimeOnly(field, ftype, nf, &dtype, tm, &fsec, &tz) != 0))
elog(ERROR, "Bad time external representation '%s'", str);
time = (TimeTzADT *) palloc(sizeof(TimeTzADT));
result = (TimeTzADT *) palloc(sizeof(TimeTzADT));
time->time = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
time->zone = tz;
result->time = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec + fsec);
result->zone = tz;
PG_RETURN_TIMETZADT_P(time);
AdjustTimeForTypmod(&(result->time), typmod);
PG_RETURN_TIMETZADT_P(result);
}
Datum
@@ -919,13 +971,15 @@ timetz_out(PG_FUNCTION_ARGS)
*tm = &tt;
double fsec;
int tz;
double trem;
char buf[MAXDATELEN + 1];
tm->tm_hour = (time->time / (60 * 60));
tm->tm_min = (((int) (time->time / 60)) % 60);
tm->tm_sec = (((int) time->time) % 60);
trem = time->time;
TMODULO(trem, tm->tm_hour, 3600e0);
TMODULO(trem, tm->tm_min, 60e0);
TMODULO(trem, tm->tm_sec, 1e0);
fsec = trem;
fsec = 0;
tz = time->zone;
EncodeTimeOnly(tm, fsec, &tz, DateStyle, buf);
@@ -934,6 +988,27 @@ timetz_out(PG_FUNCTION_ARGS)
PG_RETURN_CSTRING(result);
}
/* timetz_scale()
* Adjust time type for specified scale factor.
* Used by PostgreSQL type system to stuff columns.
*/
Datum
timetz_scale(PG_FUNCTION_ARGS)
{
TimeTzADT *time = PG_GETARG_TIMETZADT_P(0);
int32 typmod = PG_GETARG_INT32(1);
TimeTzADT *result;
result = (TimeTzADT *) palloc(sizeof(TimeTzADT));
result->time = time->time;
result->zone = time->zone;
AdjustTimeForTypmod(&(result->time), typmod);
PG_RETURN_TIMETZADT_P(result);
}
static int
timetz_cmp_internal(TimeTzADT *time1, TimeTzADT *time2)