timestamptz_izone should return the input, not NULL, when the input

is a non-finite timestamp, for consistency with related functions.
In other words: +infinity rotated to a different timezone is still
+infinity.

diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
index b2d6f774c2fb9f59ab21cd0b01f409a5436c2adc..8f18b870b5e51d1158d9f23ecd63a0eef72cafe2 100644 (file)
--- a/src/backend/utils/adt/timestamp.c
+++ b/src/backend/utils/adt/timestamp.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.152 2005/09/09 02:31:49 tgl Exp $
+ *   $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.153 2005/09/09 06:46:14 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1897,18 +1897,14 @@ timestamp_mi(PG_FUNCTION_ARGS)
    result = (Interval *) palloc(sizeof(Interval));
 
    if (TIMESTAMP_NOT_FINITE(dt1) || TIMESTAMP_NOT_FINITE(dt2))
-   {
        ereport(ERROR,
                (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
                 errmsg("cannot subtract infinite timestamps")));
 
-       result->time = 0;
-   }
-   else
 #ifdef HAVE_INT64_TIMESTAMP
-       result->time = dt1 - dt2;
+   result->time = dt1 - dt2;
 #else
-       result->time = JROUND(dt1 - dt2);
+   result->time = JROUND(dt1 - dt2);
 #endif
 
    result->month = 0;
@@ -4196,7 +4192,7 @@ timestamptz_izone(PG_FUNCTION_ARGS)
    int         tz;
 
    if (TIMESTAMP_NOT_FINITE(timestamp))
-       PG_RETURN_NULL();
+       PG_RETURN_TIMESTAMP(timestamp);
 
    if (zone->month != 0)
        ereport(ERROR,