Gabor Gevay created FLINK-7629:
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Summary: Scala stream aggregations should support nested field
expressions
Key: FLINK-7629
URL: https://issues.apache.org/jira/browse/FLINK-7629
Project: Flink
Issue Type: Bug
Components: Scala API, Streaming
Reporter: Gabor Gevay
Assignee: Gabor Gevay
Priority: Minor
Fix For: 1.4.0
In the Scala API, {{KeyedStream.maxBy}} and similar methods currently only work
with a field name, and not with nested field expressions, such as
"fieldA.fieldX". (This contradicts their documentation.)
The reason for this is that the string overload of {{KeyedStream.aggregate}}
uses {{fieldNames2Indices}} and then calls the integer overload. Instead, it
should create a {{SumAggregator}} or {{ComparableAggregator}} directly, as the
integer overload does (and as the Java API does). The ctors of
{{SumAggregator}} or {{ComparableAggregator}} will call
{{FieldAccessorFactory.getAccessor}}, which will correctly handle a nested
field expression.
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