GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/15390
[SPARK-17806] [SQL] fix bug in join key rewritten in HashJoin
## What changes were proposed in this pull request?
In HashJoin, we try to rewrite the join key as Long to improve the
performance of finding a match. The rewriting part is not well tested, has a
bug that could cause wrong result when there are at least three integral
columns in the joining key also the total length of the key exceed 8 bytes.
## How was this patch tested?
Added unit test to covering the rewriting with different number of columns
and different data types. Manually test the reported case and confirmed that
this PR fix the bug.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark rewrite_key
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15390.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 #15390
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commit 974fadb748488c1375d8ba93b6b4b3290b0e02e2
Author: Davies Liu <[email protected]>
Date: 2016-10-07T17:20:07Z
fix join key rewritten
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