GitHub user zuyu opened a pull request:
https://github.com/apache/incubator-quickstep/pull/342
DO NOT MERGE: Quickstep-119: Added the rule that eliminates a HashJoin to a
Selection if possible.
This PR adds an optimization rule that eliminates a join if at least one
side is empty.
TODO: add unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zuyu/incubator-quickstep simplify-join-rule
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/342.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 #342
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commit c670a5bec9374f9c613461114c234eeea25f2de1
Author: Zuyu Zhang <zuyu@...>
Date: 2018-04-18T22:15:34Z
Added the rule that eliminates a HashJoin to a Selection if possible.
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