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Update C comments to mention SQL:2003 handling of power return values.

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This commit is contained in:
Bruce Momjian
2008-05-09 15:36:06 +00:00
parent c5f42ce8d5
commit 6e3e60095d
2 changed files with 8 additions and 5 deletions
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8
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 1.112 2008/05/08 22:17:54 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.113 2008/05/09 15:36:06 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -1893,8 +1893,9 @@ numeric_power(PG_FUNCTION_ARGS)
trunc_var(&arg2_trunc, 0);
/*
* Return special SQLSTATE error codes for a few conditions mandated by
* the standard.
* The SQL spec requires that we emit a particular SQLSTATE error code for
* 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) ||
@ -5283,6 +5284,7 @@ power_var_int(NumericVar *base, int exp, NumericVar *result, int rscale)
/*
* While 0 ^ 0 can be either 1 or indeterminate (error), we
* treat it as 1 because most programming languages do this.
* SQL:2003 also requires a return value of 1.
* http://en.wikipedia.org/wiki/Exponentiation#Zero_to_the_zero_power
*/
set_var_from_var(&const_one, result);