[Bug]: var does not support per-level aggregation (level= kwarg)
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bug
dataframe
P2
- Dominant language
- Java
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Description
### What happened?
We used to have this issue for all aggregations (BEAM-11777), but it was resolved. Unfortunately it looks like `var` was missed.
### Issue Priority
Priority: 2
### Issue Component
Component: dsl-dataframe
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