Support PerKey Combiner.ToDict in python SDK
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core
improvement
P3
python
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- Java
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Description
-apache_beam.transforms.combiners.ToDict only support CombineGlobally semantics currently. Let's extend that to also work PerKey like many other Combiners do.-
One can just use:
```
beam.CombinePerKey(ToDictCombineFn())
```
This issue can be closed.
Imported from Jira [BEAM-12414](https://issues.apache.org/jira/browse/BEAM-12414). Original Jira may contain additional context.
Reported by: egalpin.
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