Method JoinNodes

rel/sql.go:1518–1520

We need to be able to rewrite statements to convert a stmt such as: FROM users AS u INNER JOIN orders AS o ON u.user_id = o.user_id So that we can evaluate the Join Key on left/right in this case, it is simple, just => user_id or this one: FROM users AS u INNER JOIN orders AS o ON LOW

()

//    =>  LOWER(user_id)
//
func (m *SqlSource) JoinNodes() []expr.Node {
	return m.joinNodes
}
func (m *SqlSource) Finalize() error {
	if m.final {
		return nil