Allow aggregating values of series breakout into "Other" category

When using a series breakout where the variable has many distinct values, plots can be cluttered and difficult to read.

I would like to be able to say something like "Plot the top k groups (in terms of the variable set as the Y axis) and aggregate the remaining groups into "Other".

Most of my queries are written directly in SQL, and It is possible to do this aggregation in the code, but it is cumbersome, repetitive, and error-prone.

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