GitHub user kiszk opened a pull request:
https://github.com/apache/spark/pull/19901
[SPARK-22705][SQL] Case, Coalesce, and In 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 for generated code of
`Case` and `Coalesce` and remove global variables for generated code of `In`.
2. Make lifetime of global variable local within an operation
Item 1. reduces # of constant pool entries in a Java class. Item 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 tests into `PredicateSuite`, `NullExpressionsSuite`, and
`ConditionalExpressionSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kiszk/spark SPARK-22705
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19901.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 #19901
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