GitHub user wangxiaojing opened a pull request:
https://github.com/apache/spark/pull/3362
[SPARK-4485][SQL]Add BroadcastHashOuterJoin
We are planning to create a {{BroadcastHashouterJoin}} to implement the
broadcast join for {{left outer join}} and {{right outer join}}
We use {{left outer join}} for example:
if the size of data from right side is smaller than the user-settable
threshold [[AUTO_BROADCASTJOIN_THRESHOLD]]
then we make the right side data as a broadcast
and implement the join opration reference to {{HashOuterJoin}} and
{{BroadcastHashJoin}}
else
we still use {{HashOuterJoin}}
The testsuite is writing.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangxiaojing/spark SPARK-4485
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3362.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 #3362
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commit 5591fd284fdc532e52821a6bce477a620abd69bd
Author: wangxiaojing <[email protected]>
Date: 2014-11-19T10:15:09Z
Add BroadcastHashOuterJoin
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