Disable FULL JOIN by default for ORCA
Full joins are sub-optimal in ORCA as they are implemented as a UNION of Left Outer Join AND Left Anti-Semi Join. However, GPDB provides a full outer join operator. Therefore, until ORCA implements a more optimal FULL JOIN, it will fall back to the Postgres legacy query optimizer for queries with FULL JOINs. Co-authored by: Sambitesh Dash sdash@pivotal.io Co-authored by: Ashuka Xue axue@pivotal.io
Showing
想要评论请 注册 或 登录