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Refactor JoinType for physical operators #563
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HashJoin, MergeJoin, and NestedLoopJoin all duplicate the JoinType:
Let's create a shared JoinType for physical operators.
Let's also change left/right anti-joins to specify NULL handling e.g. JOIN_TYPE_RIGHT_ANTI_WITH_NULL and JOIN_TYPE_RIGHT_ANTI_WITHOUT_NULL. See this discussion for more detail.
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