Marco Gaido created SPARK-22750:
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Summary: 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
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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