GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/11328
[SPARK-12313] improve performance of BroadcastNestedLoopJoin
## What changes were proposed in this pull request?
Currently, BroadcastNestedLoopJoin is implemented for worst case, it's too
slow, very easy to hang forever. This PR will create fast path for some
joinType and buildSide, also improve the worst case (will use much less memory
than before).
## How was the this patch tested?
existing unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark nested_loop
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11328.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #11328
----
commit ff875d152fc64dfa1c55ab7bc45208d61bb1d5d4
Author: Davies Liu <[email protected]>
Date: 2016-02-23T20:58:34Z
improve BroadcastNestedLoopJoin
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