Fabian Hueske created FLINK-1259:
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Summary: FilterFunction can modify data
Key: FLINK-1259
URL: https://issues.apache.org/jira/browse/FLINK-1259
Project: Flink
Issue Type: Bug
Components: Java API, Optimizer, Scala API
Affects Versions: 0.7.0-incubating
Reporter: Fabian Hueske
The FilterFunction returns a boolean for an input record which determines
whether the record is filtered or not.
However, the function can also modify the input record which has effects if the
record is not filtered.
The optimizer assumes that the data is not changed by a FilterFunction, i.e.,
it assumes that a Filter preserves physical data properties (orders,
partitionings, etc.) and might also be pushed down in the future. These
assumptions can result in semantically incorrect programs, if the function
actually changes its incoming records.
Possible solutions are:
- document the requirements (and hope that users read it and behave nicely)
- hand a copy to the function which can be modified but is not passed on (might
confuse users). However, this could also be integrated with the
mutable/immutable runtime switch (FLINK-1005)
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