Gabriel Reid created CRUNCH-183:
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Summary: Reservoir sampling functions don't take object reuse into
account
Key: CRUNCH-183
URL: https://issues.apache.org/jira/browse/CRUNCH-183
Project: Crunch
Issue Type: Bug
Reporter: Gabriel Reid
ReservoirSampleFn and WRSCombineFn in o.a.c.lib.SampleUtils both hold onto
references of processed values, but don't make deep copies of them. For complex
objects such as Avro objects, this leads to incorrect results, with the same
value being returned for all samples.
This can be resolved by making use of PType#getDetachedValue before storing a
reference to the object.
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