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From "Aleksander Eskilson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-18118) SpecificSafeProjection.apply of Java Object from Dataset to JavaRDD Grows Beyond 64 KB
Date Wed, 26 Oct 2016 18:09:59 GMT
Aleksander Eskilson created SPARK-18118:
-------------------------------------------

             Summary: SpecificSafeProjection.apply of Java Object from Dataset to JavaRDD
Grows Beyond 64 KB
                 Key: SPARK-18118
                 URL: https://issues.apache.org/jira/browse/SPARK-18118
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: Aleksander Eskilson


For sufficiently wide or nested Java Objects, when SpecificSafeProjection attempts to recreate
the object from an InternalRow, the generated SpecificSafeProjection.apply method is larger
than allowed: 

{code}
Caused by: org.codehaus.janino.JaninoRuntimeException: Code of method "apply(Ljava/lang/Object;)Ljava/lang/Object;"
of class "org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificSafeProjection"
grows beyond 64 KB
{code}

Although related, this issue appears not to have been resolved by SPARK-15285, as there is
only one top-level object when projecting, so splitExpressions finds no additional Expressions
on which to split. The result is a single large, nested Expression that forms the apply code.

See the reproducer for an example [1].

[1] - https://github.com/bdrillard/specific-safe-projection-error



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