GitHub user kiszk opened a pull request:
https://github.com/apache/spark/pull/19899
[SPARK-22704][SQL] Least and Greatest use less global variables
## What changes were proposed in this pull request?
This PR accomplishes the following two items.
1. Reduce # of global variables from two to one
2. Make lifetime of global variable local within an operation
1. reduces # of constant pool entries in a Java class. 2. ensures that an
variable is not passed to arguments in a method split by
`CodegenContext.splitExpressions()`, which is addressed by #19865.
## How was this patch tested?
Added new test into `ArithmeticExpressionSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kiszk/spark SPARK-22704
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19899.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 #19899
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commit 544d23d599fa89b58f7eb394dd034515fd1eba1a
Author: Kazuaki Ishizaki <[email protected]>
Date: 2017-12-05T15:47:16Z
initial commit
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