Hello Guys,
Lately, I saw this syntax in ./src/backend/parser/Gray.y as following!
CreateFunctionStmt:
CREATE opt_or_replace FUNCTION func_name
func_args_with_defaults
RETURNS func_return createfunc_opt_list opt_definition
{
CreateFunctionStmt *n =
makeNode(CreateFunctionStmt);
n->replace = $2;
n->funcname = $4;
n->parameters = $5;
n->returnType = $7;
n->options = $8;
n->withClause = $9;
$$ = (Node *)n;
}
| CREATE opt_or_replace FUNCTION func_name
func_args_with_defaults
RETURNS TABLE '(' table_func_column_list ')'
createfunc_opt_list opt_definition
{
CreateFunctionStmt *n =
makeNode(CreateFunctionStmt);
n->replace = $2;
n->funcname = $4;
n->parameters =
mergeTableFuncParameters($5, $9);
n->returnType = TableFuncTypeName($9);
n->returnType->location = @7;
n->options = $11;
n->withClause = $12;
$$ = (Node *)n;
}
| CREATE opt_or_replace FUNCTION func_name
func_args_with_defaults
createfunc_opt_list opt_definition
{
CreateFunctionStmt *n =
makeNode(CreateFunctionStmt);
n->replace = $2;
n->funcname = $4;
n->parameters = $5;
n->returnType = NULL;
n->options = $6;
n->withClause = $7;
$$ = (Node *)n;
}
;
I do not know how to use the second syntax:RETURNS TABLE '('
table_func_column_list ')' createfunc_opt_list opt_definition.
May someone help me to write a simple example of this syntax! Thank
you very much. Looking forward for your help!
