GitHub user rednaxelafx opened a pull request:
https://github.com/apache/spark/pull/20626
[SPARK-23447][SQL] Cleanup codegen template for Literal
## What changes were proposed in this pull request?
Cleaned up the codegen templates for `Literal`s, to make sure that the
`ExprCode` returned from `Literal.doGenCode()` has:
1. an empty `code` field;
2. an `isNull` field of either literal `true` or `false`;
3. a `value` field that is just a simple literal/constant.
Before this PR, there are a couple of paths that would return a non-trivial
`code` and all of them are actually unnecessary. The `NaN` and `Infinity`
constants for `double` and `float` can be accessed through constants directly
available so there's no need to add a reference for them.
Also took the opportunity to add a new util method for ease of creating
`ExprCode` for inline-able non-null values.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rednaxelafx/apache-spark codegen-literal
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20626.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 #20626
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commit 68edf0f3463daed3bb7042becb333788b22b23b0
Author: Kris Mok <kris.mok@...>
Date: 2018-02-16T07:44:43Z
Cleanup codegen templates for Literals: make sure the `code` field is empty
and the `value` field is a simple literal.
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