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Commit826604f

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Fix interval division and multiplication, before:
test=> select '4 months'::interval / 5; ?column?--------------- 1 mon -6 days(1 row)after:test=> select '4 months'::interval / 5; ?column?---------- 24 days(1 row)The problem was the use of rint() to round, and then find the remainder,causing the negative values.
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‎src/backend/utils/adt/timestamp.c‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.132 2005/07/12 16:04:58 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.133 2005/07/20 03:50:24 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -2201,7 +2201,7 @@ interval_mul(PG_FUNCTION_ARGS)
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result->time+= (months-result->month)*INT64CONST(30)*
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USECS_PER_DAY;
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#else
2204-
result->month=rint(months);
2204+
result->month=(int)months;
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result->time=JROUND(span1->time*factor);
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/* evaluate fractional months as 30 days */
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result->time+=JROUND((months-result->month)*30*SECS_PER_DAY);
@@ -2246,7 +2246,7 @@ interval_div(PG_FUNCTION_ARGS)
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INT64CONST(30)*USECS_PER_DAY) /factor;
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#else
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months=span->month /factor;
2249-
result->month=rint(months);
2249+
result->month=(int)months;
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result->time=JROUND(span->time /factor);
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/* evaluate fractional months as 30 days */
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result->time+=JROUND((months-result->month)*30*SECS_PER_DAY);

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