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由 Sambitesh Dash 提交于
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
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