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From cloud-fan <>
Subject [GitHub] spark pull request: [SPARK-15140][SPARK-15441][SQL][WIP] support null object...
Date Tue, 31 May 2016 20:07:55 GMT
Github user cloud-fan commented on the pull request:
    @zhzhan , for outer join, if it's a typed join, then both of the join side will include
this hidden column, as their columns are produced by serializing custom object. If we need
to return null for one join side, we will null out all columns of that side, including the
hidden column. Then when we deserialize it, we can know that this join side is null and we
can build a null object for it.

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