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Support use of function argument names to identify which actual arguments

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match which function parameters.  The syntax uses AS, for example
	funcname(value AS arg1, anothervalue AS arg2)

Pavel Stehule
This commit is contained in:
Tom Lane
2009-10-08 02:39:25 +00:00
parent 2eda8dfb52
commit 717fa274d1
34 changed files with 1925 additions and 274 deletions
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36
src/backend/commands/functioncmds.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/functioncmds.c,v 1.111 2009/09/22 23:43:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/functioncmds.c,v 1.112 2009/10/08 02:39:19 tgl Exp $
*
* DESCRIPTION
* These routines take the parse tree and pick out the
@ -285,6 +285,39 @@ examine_parameter_list(List *parameters, Oid languageOid,
if (fp->name && fp->name[0])
{
ListCell *px;
/*
* As of Postgres 8.5 we disallow using the same name for two
* input or two output function parameters. Depending on the
* function's language, conflicting input and output names might
* be bad too, but we leave it to the PL to complain if so.
*/
foreach(px, parameters)
{
FunctionParameter *prevfp = (FunctionParameter *) lfirst(px);
if (prevfp == fp)
break;
/* pure in doesn't conflict with pure out */
if ((fp->mode == FUNC_PARAM_IN ||
fp->mode == FUNC_PARAM_VARIADIC) &&
(prevfp->mode == FUNC_PARAM_OUT ||
prevfp->mode == FUNC_PARAM_TABLE))
continue;
if ((prevfp->mode == FUNC_PARAM_IN ||
prevfp->mode == FUNC_PARAM_VARIADIC) &&
(fp->mode == FUNC_PARAM_OUT ||
fp->mode == FUNC_PARAM_TABLE))
continue;
if (prevfp->name && prevfp->name[0] &&
strcmp(prevfp->name, fp->name) == 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("parameter name \"%s\" used more than once",
fp->name)));
}
paramNames[i] = CStringGetTextDatum(fp->name);
have_names = true;
}
@ -1097,6 +1130,7 @@ RenameFunction(List *name, List *argtypes, const char *newname)
errmsg("function %s already exists in schema \"%s\"",
funcname_signature_string(newname,
procForm->pronargs,
NIL,
procForm->proargtypes.values),
get_namespace_name(namespaceOid))));
}