- - _DoSearch
  - _FieldToFunction FIELD
  - AddEmptyRows

## _DoSearch

Subclass _DoSearch from our parent so we can go through and add in empty columns if it makes sense

## _FieldToFunction FIELD

Returns a tuple of the field or a database function to allow grouping on that field.

## AddEmptyRows

If we're grouping on a criterion we know how to add zero-value rows for, do that.

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