apache / apache/beam

[Feature Request]: Implement `pd.get_dummies()` for deferred DataFrame

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dataframe dsl new feature P2
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Description

### What would you like to happen?

We would like to use the DataFrame API to perform one-hot encoding on categorical columns. Currently, this can be done with `pd.get_dummies()` method but it's currently not supported for deffered DataFrames.

### Issue Priority

Priority: 2

### Issue Component

Component: dsl-dataframe

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