Andy Schlaikjer created PIG-2915:
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Summary: Builtin TOP udf is sensitive to null input bags
Key: PIG-2915
URL: https://issues.apache.org/jira/browse/PIG-2915
Project: Pig
Issue Type: Improvement
Components: internal-udfs
Affects Versions: 0.11
Reporter: Andy Schlaikjer
TOP(max, sortField, inputBag) is sensitive to null inputBag arguments.
In some cases it is preferable for a UDF to simply return null for null inputs
e.g. to avoid conditional logic in a script.
Most of the UDFs I write act this way, but TOP does not. This patch updates TOP
to return null in the case where all input bags are null. Unit tests are
included to confirm expected behavior.
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