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Adjust power() error messages to be more descriptive.

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This commit is contained in:
Bruce Momjian
2008-05-09 21:31:23 +00:00
parent 3159040627
commit f8df836ae3
2 changed files with 17 additions and 10 deletions
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16
src/backend/utils/adt/numeric.c
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@ -14,7 +14,7 @@
* Copyright (c) 1998-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.113 2008/05/09 15:36:06 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.114 2008/05/09 21:31:23 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -1897,13 +1897,17 @@ numeric_power(PG_FUNCTION_ARGS)
* certain error conditions. Specifically, we don't return a divide-by-zero
* error code for 0 ^ -1.
*/
if ((cmp_var(&arg1, &const_zero) == 0 &&
cmp_var(&arg2, &const_zero) < 0) ||
(cmp_var(&arg1, &const_zero) < 0 &&
cmp_var(&arg2, &arg2_trunc) != 0))
if (cmp_var(&arg1, &const_zero) == 0 &&
cmp_var(&arg2, &const_zero) < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_POWER_FUNCTION),
errmsg("invalid argument for power function")));
errmsg("zero raised to a negative power is undefined")));
if (cmp_var(&arg1, &const_zero) < 0 &&
cmp_var(&arg2, &arg2_trunc) != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_POWER_FUNCTION),
errmsg("a negative number raised to a non-integer power yields a complex result")));
/*
* Call power_var() to compute and return the result; note it handles