Introduce Union type coder
Open
core
new feature
P3
python
types
- Dominant language
- Java
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Description
Union[...] type hint seems to be encoded as Any at this moment, introducing UnionCoder may yield encoding/decoding performance gains
Imported from Jira [BEAM-13061](https://issues.apache.org/jira/browse/BEAM-13061). Original Jira may contain additional context.
Reported by: iindyk.
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