Function checkExprIsVarFree

src/backend/parser/parse_clause.c:2010–2023

* checkExprIsVarFree * Check that given expr has no Vars of the current query level * (aggregates and window functions should have been rejected already). * * This is used to check expressions that have to have a consistent value * across all rows of the query, such as a LIMIT. Arguably it should reject * volatile functions, too, but we don't do that --- whatever value the * function giv

 * constructName does not affect the semantics, but is used in error messages
 */
static void
checkExprIsVarFree(ParseState *pstate, Node *n, const char *constructName)
{
	if (contain_vars_of_level(n, 0))
	{
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
		/* translator: %s is name of a SQL construct, eg LIMIT */
				 errmsg("argument of %s must not contain variables",
						constructName),
				 parser_errposition(pstate,
									locate_var_of_level(n, 0))));
	}
}


/*