Josh Wills created CRUNCH-511:
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Summary: Scrunch product type support should use derived() instead
of derivedImmutable()
Key: CRUNCH-511
URL: https://issues.apache.org/jira/browse/CRUNCH-511
Project: Crunch
Issue Type: Bug
Components: Scrunch
Reporter: Josh Wills
Ran into a subtle bug related to Scrunch case class support: right now, I was
using derivedImmutable to generate the mapping from an Avro record in to a
Scala case class, thinking (foolishly, as it turned out) that case classes were
always immutable. Although that's true, the arguments that get passed to the
case class constructor (the fields of the Avro record) are not necessarily
immutable (e.g., an Avro ByteBuffer gets reused from key to key in a reduce),
and those values can cause join key errors.
I wrote a test case to illustrate the bug and switched the case class PType
generator to use derived instead of derivedImmutable.
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