Greg Hogan created FLINK-3978:
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Summary: Add contains methods to RuntimeContext
Key: FLINK-3978
URL: https://issues.apache.org/jira/browse/FLINK-3978
Project: Flink
Issue Type: Improvement
Components: Core
Affects Versions: 1.1.0
Reporter: Greg Hogan
Assignee: Greg Hogan
Priority: Minor
The javadocs for `RuntimeContext` state that `getAccumulator` "throws an
exception if the accumulator does not exist or if the accumulator exists, but
with different type", although `AbstractRuntimeUDFContext` does not throw an
exception but will return null.
The javadocs for `getBroadcastVariable` do not mention throwing an exception.
Currently the only way to handle a broadcast variable that that may or may not
exist is to catch and ignore the exception. Adding a
`containsBroadcastVariable` method to `RuntimeContext` would make this
explicit. Likewise, `containsAccumulator`.
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