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Change ln(), log(), power(), and sqrt() to emit the correct SQLSTATE

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error codes for certain error conditions, as specified by SQL2003.
This commit is contained in:
Neil Conway
2004-05-16 23:18:55 +00:00
parent 335cf9ae7f
commit 2871f60f23
4 changed files with 68 additions and 15 deletions
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30
src/backend/utils/adt/numeric.c
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@ -14,7 +14,7 @@
* Copyright (c) 1998-2003, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.74 2004/05/14 21:42:28 neilc Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.75 2004/05/16 23:18:55 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@ -1668,6 +1668,7 @@ numeric_power(PG_FUNCTION_ARGS)
Numeric res;
NumericVar arg1;
NumericVar arg2;
NumericVar arg2_trunc;
NumericVar result;
/*
@ -1681,10 +1682,26 @@ numeric_power(PG_FUNCTION_ARGS)
*/
init_var(&arg1);
init_var(&arg2);
init_var(&arg2_trunc);
init_var(&result);
set_var_from_num(num1, &arg1);
set_var_from_num(num2, &arg2);
set_var_from_var(&arg2, &arg2_trunc);
trunc_var(&arg2_trunc, 0);
/*
* Return special SQLSTATE error codes for a few conditions
* mandated by the standard.
*/
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))
ereport(ERROR,
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_POWER_FUNCTION),
errmsg("invalid argument for power function")));
/*
* Call power_var() to compute and return the result; note it handles
@ -1696,6 +1713,7 @@ numeric_power(PG_FUNCTION_ARGS)
free_var(&result);
free_var(&arg2);
free_var(&arg2_trunc);
free_var(&arg1);
PG_RETURN_NUMERIC(res);
@ -4408,10 +4426,16 @@ ln_var(NumericVar *arg, NumericVar *result, int rscale)
NumericVar elem;
NumericVar fact;
int local_rscale;
int cmp;
if (cmp_var(arg, &const_zero) <= 0)
cmp = cmp_var(arg, &const_zero);
if (cmp == 0)
ereport(ERROR,
(errcode(ERRCODE_FLOATING_POINT_EXCEPTION),
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_LOG),
errmsg("cannot take logarithm of zero")));
else if (cmp < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_LOG),
errmsg("cannot take logarithm of a negative number")));
local_rscale = rscale + 8;