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https://issues.apache.org/jira/browse/SPARK-22750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-22750:
-----------------------------------
Assignee: Marco Gaido
> Introduce reusable mutable states
> ---------------------------------
>
> Key: SPARK-22750
> URL: https://issues.apache.org/jira/browse/SPARK-22750
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Marco Gaido
> Assignee: Marco Gaido
> Fix For: 2.3.0
>
>
> In code generation, adding many mutable states can be dangerous since we can
> hit the constant pool limit.
> In the current code, each expression generates its own copy of mutable states
> and mutable states cannot be shared across different expression. There are
> many cases, though, in which this can be done and it can be useful. For
> instance, we create a UTC timezone object for each date function which
> requires it, even though we might reuse always the same.
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