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Implement Named Aggregation #823

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charlesdong1991 opened this issue Sep 23, 2019 · 0 comments · Fixed by #911
Closed

Implement Named Aggregation #823

charlesdong1991 opened this issue Sep 23, 2019 · 0 comments · Fixed by #911
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enhancement New feature or request

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@charlesdong1991
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Pandas has put forward a named aggregation for groupby aggregation since 0.25.0, I am working on an implementation on this.
@HyukjinKwon HyukjinKwon added the enhancement New feature or request label Sep 26, 2019
@harupy harupy mentioned this issue Oct 8, 2019
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@charlesdong1991 charlesdong1991 mentioned this issue Oct 9, 2019
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HyukjinKwon pushed a commit that referenced this issue Oct 11, 2019
@charlesdong1991 @HyukjinKwon
Add NamedAgg (#911)
a7fc8f8 
This is equivalent to nested renaming, so like pandas, we have `koalas.NamedAgg` now for this:
```python
        >>> aggregated = df.groupby('A').agg(b_max=ks.NamedAgg(column='B', aggfunc='max'))
        >>> aggregated
             b_max
        A
        1        2
        2        4
```

Resolves #823
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Add NamedAgg charlesdong1991/koalas
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@HyukjinKwon @charlesdong1991