Github user concretevitamin commented on the pull request:
https://github.com/apache/spark/pull/1163#issuecomment-47029361
I have updated this PR to only include broadcast hash join, as well as its
test.
For the join test framework: if we want to add this, we can do it in a
follow-up PR in the future. Currently I just put all join-related tests into
one place. For the specific case of BHJ, the existing testing infrastructure
seems adequate enough for testing the planner as well as the correctness of
output.
For size estimation: I have removed all related changes in this PR. We'd
want to think more about this and come up with a more general framework for
support estimation. Therefore, the only way to use BHJ with this patch is to
provide a hint.
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