GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/11851
[SPARK-14029][SQL] Improve BooleanSimplification optimization by
implementing `Not` canonicalization.
## What changes were proposed in this pull request?
Currently, **BooleanSimplification** optimization can handle the following
cases.
* a && (!'a || 'b ) ==> 'a && 'b
* a && ('b || !'a ) ==> 'a && 'b
However, it can not handle the followings cases since those equations fails
at the comparisons between their canonicalized forms.
* a < 1 && (!('a < 1) || 'b) ==> ('a < 1) && 'b
* a <= 1 && (!('a <= 1) || 'b) ==> ('a <= 1) && 'b
* a > 1 && (!('a > 1) || 'b) ==> ('a > 1) && 'b
* a >= 1 && (!('a >= 1) || 'b) ==> ('a >= 1) && 'b
This PR implements the above cases and also the followings, too.
* a < 1 && ('a >= 1 || 'b ) ==> ('a < 1) && 'b
* a <= 1 && ('a > 1 || 'b ) ==> ('a <= 1) && 'b
* a > 1 && (('a <= 1) || 'b) ==> ('a > 1) && 'b
* a >= 1 && (('a < 1) || 'b) ==> ('a >= 1) && 'b
## How was this patch tested?
Pass the Jenkins tests including new test cases in BooleanSimplicationSuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-14029
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11851.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 #11851
----
commit 6e63f8a918a1dc0d6e425a52150812e66d61f657
Author: Dongjoon Hyun <[email protected]>
Date: 2016-03-20T10:29:05Z
[SPARK-14029][SQL] Improve BooleanSimplification optimization by
implementing `Not` canonicalization.
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