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Break out xxx2yyy_opt_overflow APIs for more datetime conversions.

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Previous commits invented timestamp2timestamptz_opt_overflow,
date2timestamp_opt_overflow, and date2timestamptz_opt_overflow
functions to perform non-error-throwing conversions between
datetime types.  This patch completes the set by adding
timestamp2date_opt_overflow, timestamptz2date_opt_overflow,
and timestamptz2timestamp_opt_overflow.

In addition, adjust timestamp2timestamptz_opt_overflow so that it
doesn't throw error if timestamp2tm fails, but treats that as an
overflow case.  The situation probably can't arise except with an
invalid timestamp value, and I can't think of a way that that would
happen except data corruption.  However, it's pretty silly to have a
function whose entire reason for existence is to not throw errors for
out-of-range inputs nonetheless throw an error for out-of-range input.

The new APIs are not used in this patch, but will be needed in
upcoming btree_gin changes.

Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Arseniy Mukhin <arseniy.mukhin.dev@gmail.com>
Discussion: https://postgr.es/m/262624.1738460652@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2025-07-03 16:17:08 -04:00
parent a10f21e6ce
commit 0059bbe1ec
4 changed files with 157 additions and 17 deletions
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86
src/backend/utils/adt/date.c
View File

@@ -1363,10 +1363,35 @@ timestamp_date(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
DateADT result;
result = timestamp2date_opt_overflow(timestamp, NULL);
PG_RETURN_DATEADT(result);
}
/*
* Convert timestamp to date.
*
* On successful conversion, *overflow is set to zero if it's not NULL.
*
* If the timestamp is finite but out of the valid range for date, then:
* if overflow is NULL, we throw an out-of-range error.
* if overflow is not NULL, we store +1 or -1 there to indicate the sign
* of the overflow, and return the appropriate date infinity.
*
* Note: given the ranges of the types, overflow is only possible at
* the minimum end of the range, but we don't assume that in this code.
*/
DateADT
timestamp2date_opt_overflow(Timestamp timestamp, int *overflow)
{
DateADT result;
struct pg_tm tt,
*tm = &tt;
fsec_t fsec;
if (overflow)
*overflow = 0;
if (TIMESTAMP_IS_NOBEGIN(timestamp))
DATE_NOBEGIN(result);
else if (TIMESTAMP_IS_NOEND(timestamp))
@@ -1374,14 +1399,30 @@ timestamp_date(PG_FUNCTION_ARGS)
else
{
if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL) != 0)
{
if (overflow)
{
if (timestamp < 0)
{
*overflow = -1;
DATE_NOBEGIN(result);
}
else
{
*overflow = 1; /* not actually reachable */
DATE_NOEND(result);
}
return result;
}
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
}
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
}
PG_RETURN_DATEADT(result);
return result;
}
@@ -1408,11 +1449,36 @@ timestamptz_date(PG_FUNCTION_ARGS)
{
TimestampTz timestamp = PG_GETARG_TIMESTAMP(0);
DateADT result;
result = timestamptz2date_opt_overflow(timestamp, NULL);
PG_RETURN_DATEADT(result);
}
/*
* Convert timestamptz to date.
*
* On successful conversion, *overflow is set to zero if it's not NULL.
*
* If the timestamptz is finite but out of the valid range for date, then:
* if overflow is NULL, we throw an out-of-range error.
* if overflow is not NULL, we store +1 or -1 there to indicate the sign
* of the overflow, and return the appropriate date infinity.
*
* Note: given the ranges of the types, overflow is only possible at
* the minimum end of the range, but we don't assume that in this code.
*/
DateADT
timestamptz2date_opt_overflow(TimestampTz timestamp, int *overflow)
{
DateADT result;
struct pg_tm tt,
*tm = &tt;
fsec_t fsec;
int tz;
if (overflow)
*overflow = 0;
if (TIMESTAMP_IS_NOBEGIN(timestamp))
DATE_NOBEGIN(result);
else if (TIMESTAMP_IS_NOEND(timestamp))
@@ -1420,14 +1486,30 @@ timestamptz_date(PG_FUNCTION_ARGS)
else
{
if (timestamp2tm(timestamp, &tz, tm, &fsec, NULL, NULL) != 0)
{
if (overflow)
{
if (timestamp < 0)
{
*overflow = -1;
DATE_NOBEGIN(result);
}
else
{
*overflow = 1; /* not actually reachable */
DATE_NOEND(result);
}
return result;
}
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
}
result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
}
PG_RETURN_DATEADT(result);
return result;
}