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https://issues.apache.org/jira/browse/SPARK-21038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-21038.
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Resolution: Incomplete
> Reduce redundant generated init code in Catalyst codegen
> --------------------------------------------------------
>
> Key: SPARK-21038
> URL: https://issues.apache.org/jira/browse/SPARK-21038
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Kris Mok
> Priority: Minor
> Labels: bulk-closed
>
> In Java, instance fields are guaranteed to be first initialized to their
> corresponding default values (zero values) before the constructor is invoked.
> Thus, explicitly code to initialize fields to their zero values is redundant
> and should be avoided.
> It's usually harmless to have such code in hand-written constructors, but in
> the case of mechanically generating code, such code could contribute to a
> significant portion of the code size and cause issues.
> This ticket is a step in reducing the likelihood of hitting the 64KB bytecode
> method size limit in the Java Class files. The proposal is to use some simple
> heuristics to filter out redundant code of initializing mutable state to
> their default (zero) values in CodegenContext.addMutableState.
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