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Commit52ad1e6

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Refactor jsonpath's compareDatetime()
This commit refactors come ridiculous coding in compareDatetime(). Also, itprovides correct cross-datatype comparison even when one of values overflowsduring cast. That eliminates dilemma on whether we should suppress overflowerrors during cast.Reported-by: Tom LaneDiscussion:https://postgr.es/m/32308.1569455803%40sss.pgh.pa.usDiscussion:https://postgr.es/m/a5629d0c-8162-7559-16aa-0c8390d6ba5f%40postgrespro.ruAuthor: Nikita Glukhov, Alexander Korotkov
1 parenta6888fd commit52ad1e6

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7 files changed

+237
-144
lines changed

7 files changed

+237
-144
lines changed

‎src/backend/utils/adt/date.c‎

Lines changed: 24 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -554,11 +554,12 @@ date_mii(PG_FUNCTION_ARGS)
554554
/*
555555
* Promote date to timestamp.
556556
*
557-
* If 'have_error' is NULL, then errors are thrown, else '*have_error' is set
558-
* and zero is returned.
557+
* On overflow error is thrown if 'overflow' is NULL. Otherwise, '*overflow'
558+
* is set to -1 (+1) when result value exceed lower (upper) boundary and zero
559+
* returned.
559560
*/
560561
Timestamp
561-
date2timestamp_opt_error(DateADTdateVal,bool*have_error)
562+
date2timestamp_opt_overflow(DateADTdateVal,int*overflow)
562563
{
563564
Timestampresult;
564565

@@ -575,9 +576,9 @@ date2timestamp_opt_error(DateADT dateVal, bool *have_error)
575576
*/
576577
if (dateVal >= (TIMESTAMP_END_JULIAN-POSTGRES_EPOCH_JDATE))
577578
{
578-
if (have_error)
579+
if (overflow)
579580
{
580-
*have_error=true;
581+
*overflow=1;
581582
return (Timestamp)0;
582583
}
583584
else
@@ -596,22 +597,23 @@ date2timestamp_opt_error(DateADT dateVal, bool *have_error)
596597
}
597598

598599
/*
599-
* Single-argument version ofdate2timestamp_opt_error().
600+
* Single-argument version ofdate2timestamp_opt_overflow().
600601
*/
601602
staticTimestampTz
602603
date2timestamp(DateADTdateVal)
603604
{
604-
returndate2timestamp_opt_error(dateVal,NULL);
605+
returndate2timestamp_opt_overflow(dateVal,NULL);
605606
}
606607

607608
/*
608609
* Promote date to timestamp with time zone.
609610
*
610-
* If 'have_error' is NULL, then errors are thrown, else '*have_error' is set
611-
* and zero is returned.
611+
* On overflow error is thrown if 'overflow' is NULL. Otherwise, '*overflow'
612+
* is set to -1 (+1) when result value exceed lower (upper) boundary and zero
613+
* returned.
612614
*/
613615
TimestampTz
614-
date2timestamptz_opt_error(DateADTdateVal,bool*have_error)
616+
date2timestamptz_opt_overflow(DateADTdateVal,int*overflow)
615617
{
616618
TimestampTzresult;
617619
structpg_tmtt,
@@ -631,9 +633,9 @@ date2timestamptz_opt_error(DateADT dateVal, bool *have_error)
631633
*/
632634
if (dateVal >= (TIMESTAMP_END_JULIAN-POSTGRES_EPOCH_JDATE))
633635
{
634-
if (have_error)
636+
if (overflow)
635637
{
636-
*have_error=true;
638+
*overflow=1;
637639
return (TimestampTz)0;
638640
}
639641
else
@@ -659,9 +661,15 @@ date2timestamptz_opt_error(DateADT dateVal, bool *have_error)
659661
*/
660662
if (!IS_VALID_TIMESTAMP(result))
661663
{
662-
if (have_error)
664+
if (overflow)
663665
{
664-
*have_error= true;
666+
if (result<MIN_TIMESTAMP)
667+
*overflow=-1;
668+
else
669+
{
670+
Assert(result >=END_TIMESTAMP);
671+
*overflow=1;
672+
}
665673
return (TimestampTz)0;
666674
}
667675
else
@@ -677,12 +685,12 @@ date2timestamptz_opt_error(DateADT dateVal, bool *have_error)
677685
}
678686

679687
/*
680-
* Single-argument version ofdate2timestamptz_opt_error().
688+
* Single-argument version ofdate2timestamptz_opt_overflow().
681689
*/
682690
staticTimestampTz
683691
date2timestamptz(DateADTdateVal)
684692
{
685-
returndate2timestamptz_opt_error(dateVal,NULL);
693+
returndate2timestamptz_opt_overflow(dateVal,NULL);
686694
}
687695

688696
/*

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