Kris Mok created SPARK-21038:
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Summary: 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
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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