Enable custom UDF for sorting criterion in @RequiresTimeSortedInput
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core
improvement
java
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Description
The current implementation of @RequiresTimeSortedInput sorts data on event timestamp. Users might want to sort on other (meta)data, which should be fine, as long as the metadata correlates with watermark (and allowedLateness).
Imported from Jira [BEAM-9257](https://issues.apache.org/jira/browse/BEAM-9257). Original Jira may contain additional context.
Reported by: janl.
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