Apply fix so pow() and exp() ERANGE is used only if result is not 0.

diff --git a/src/backend/utils/adt/float.c b/src/backend/utils/adt/float.c
index 263a13a314842e7202d2a0decbc93783953df021..44fe89296e851a372f8dfa090b361ade085f3ae0 100644 (file)
--- a/src/backend/utils/adt/float.c
+++ b/src/backend/utils/adt/float.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.145 2007/01/06 15:18:02 momjian Exp $
+ *   $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.146 2007/01/06 20:21:29 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1459,7 +1459,7 @@ dpow(PG_FUNCTION_ARGS)
        else
            result = 1;
    }
-   else if (errno == ERANGE && !isinf(result))
+   else if (errno == ERANGE && result != 0 && !isinf(result))
        result = get_float8_infinity();
    
    CHECKFLOATVAL(result, isinf(arg1) || isinf(arg2), arg1 == 0);
@@ -1478,7 +1478,7 @@ dexp(PG_FUNCTION_ARGS)
 
    errno = 0;
    result = exp(arg1);
-   if (errno == ERANGE && !isinf(result))
+   if (errno == ERANGE && result != 0 && !isinf(result))
        result = get_float8_infinity();
 
    CHECKFLOATVAL(result, isinf(arg1), false);