[FEA] Number unique stat and Join_Groupby op

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
pandas, python
Domain
data

Research direction

Start by locating the existing stats and the join_groupby op, then compare their behavior with the referenced pandas DataFrame.nunique documentation. The work is done when a number-unique stat is available and integrated into join_groupby with coverage for the requested behavior.

Written by the indexing model from the issue text.

Description

Is your feature request related to a problem? Please describe.
Currently, NVTabular does not support the number unique stat that would be very useful in some workflows.

Describe the solution you'd like
An implementation of number unique as a stat and integration in a join_groupby op.

Describe alternatives you've considered
N/A

Additional context
N/A

Dominant language
Python
Stars
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Forks
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