damccorm opened a new issue, #20356:
URL: https://github.com/apache/beam/issues/20356
Trying to Count the number of rows in a window with Group and Combiner (as
opposed to GroupBy "*" or a any field), but get an error:
.apply("WindowByMinute",
Window.into(FixedWindows.of(Duration.standardSeconds(60))))
.apply("CountPerMinute",
Group.<Row\>globally().aggregate(Count.combineFn()))
threw:
ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java
(default-cli) on project advanced-dataflow-lab: An exception occured while
executing the Java class. If the input collection uses a windowing strategy
other than GlobalWindows, use
Combine.globally(Count.<T\>combineFn()).withoutDefaults() instead. -\>
Reuven Lax has indicated this is likely a bug.
Imported from Jira
[BEAM-10297](https://issues.apache.org/jira/browse/BEAM-10297). Original Jira
may contain additional context.
Reported by: dhodun.
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