h2oai / h2oai/datatable

grouping could preserve original order

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#1,070 2 comments 0 reactions 0 assignees View on GitHub
groupby improve low priority
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C++
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Description

When doing
```
ans = x(select=mean(f.v1), groupby="id1")
```
we are getting aggregated results that are also sorted by `id1`. It is sometimes useful to retain original order of values from `id1` column, so aggregated results does not have to be sorted.

actually grouping column is not returned yet so it is not clear what is the order of results.

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