Function isReadOnlySelect

backend/plugin/parser/tsql/query.go:40–46

isReadOnlySelect returns true for SELECT statements without an INTO target. Non-SELECT nodes and SELECT ... INTO are rejected — INTO materialises a new table which is a DDL-like side effect.

(node ast.Node)

// Non-SELECT nodes and SELECT ... INTO are rejected — INTO materialises a new
// table which is a DDL-like side effect.
func isReadOnlySelect(node ast.Node) bool {
	sel, ok := node.(*ast.SelectStmt)
	if !ok {
		return false
	}
	return !HasSelectInto(sel)
}

// HasSelectInto reports whether sel (or any branch of its set operations)
// carries an INTO clause.