GitHub user zuyu opened a pull request:
https://github.com/apache/incubator-quickstep/pull/257
Added Partition Rule for HashJoin.
This PR substitutes #241 to add support for partitioned hash join. The rule
adds repartitions if needed as follows:
```
/*
* Whether left or right side needs to repartition.
*
*
--------------------------------------------------------------------------
* | Right \ Left | No Partition | Hash Partition h' | Other
Partition |
*
--------------------------------------------------------------------------
* | No Partition | false \ false | false \ false | true \
true |
*
--------------------------------------------------------------------------
* | Hash Partition h | false \ true | false* \ false | false \
true |
*
--------------------------------------------------------------------------
* | Other Partition | true \ true | true \ false | true \
true |
*
--------------------------------------------------------------------------
*
* Hash Partition h / h': the paritition attributes are as the same
as the join attributes.
* *: If h and h' has different number of partitions, the left side
needs to repartition.
*/
```
Assigned to @jianqiao.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zuyu/incubator-quickstep
partition-rule-for-hash-join
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/257.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 #257
----
commit 46f514dcd5d22ab3cecaa8dcb2446ebdd8dba6e7
Author: Zuyu Zhang <[email protected]>
Date: 2017-06-14T02:50:41Z
Added Partition Rule for HashJoin.
----
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