Support @<local> in eval and query
Open
core
dataframe
dsl
improvement
P3
python
- Dominant language
- Java
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Description
```
df_a = ...
df_b.eval('foo = @df_a.bar + baz')
```
Currently we don't support accessing other frames in eval and query like this, but it should be possible to implement as a zipping operation.
Imported from Jira [BEAM-11202](https://issues.apache.org/jira/browse/BEAM-11202). Original Jira may contain additional context.
Reported by: bhulette.
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