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Posted to reviews@spark.apache.org by cloud-fan <gi...@git.apache.org> on 2018/06/25 15:32:43 UTC

[GitHub] spark issue #21403: [SPARK-24341][SQL] Support only IN subqueries with the s...

Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/21403
  
    I agree with the proposed behavior, but I'm a little worried about hacking the existig `In` expression to implement it.
    
    I took a look at postgres, `a = b` is equal to `a.i = b.i and a.j = b.j` if `a` and `b` are both struct type with same number of fields with same type. If we make Spark's equal operator follow this semantic, it can make this PR simpler.


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