Function checkWindowFuncInRecursiveTerm

src/backend/parser/parse_cte.c:1273–1293

}

static void
checkWindowFuncInRecursiveTerm(SelectStmt *stmt, CteState *cstate)
{
	CTEWindowAggSearchContext context;

	context.found = false;
	context.func  = NULL;

	(void) raw_expression_tree_walker((Node *) stmt->targetList,
									  cte_window_agg_walker,
									  (void *) &context);

	if (context.found)
	{
		ereport(ERROR,
				(errcode(ERRCODE_GP_FEATURE_NOT_YET),
				 errmsg("window functions in the target list of a recursive query is not supported"),
				 parser_errposition(cstate->pstate,
									exprLocation((Node *) context.func))));
	}
}