[jira] [Assigned] (SPARK-23447) Cleanup codegen template for Literal

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-23447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-23447:
------------------------------------

    Assignee:     (was: Apache Spark)

> Cleanup codegen template for Literal
> ------------------------------------
>
>                 Key: SPARK-23447
>                 URL: https://issues.apache.org/jira/browse/SPARK-23447
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0, 2.2.1
>            Reporter: Kris Mok
>            Priority: Major
>
> Ideally, the codegen templates for {{Literal}} should emit literals in the {{isNull}} and {{value}} fields of {{ExprCode}} so that they can be effectively inlined into their use sites.
> But currently there are a couple of paths where {{Literal.doGenCode()}} return {{ExprCode}} that has non-trivial {{code}} field, and all of those are actually unnecessary.
> We can make a simple refactoring to make sure all codegen templates for {{Literal}} return empty {{code}} and simple literal/constant expressions in {{isNull}} and {{value}}.



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