Unassigning myself for now as I'm not sure when I find time to work on it again. Started work on it here: https://github.com/matomo-org/matomo/compare/5711

Done so far:

For regular data tables support date1=&period1= for date comparison, as well as &segment1=...&segment2=&segment3=&segment4= for segment comparison. both can be used together
Adjusted date selector to support comparisons (not fully finished eg compare date needs to adjust automatically depending on selection of comparison period and selected period etc)
When comparing data, we automatically flatten the data (at least for now)... maybe some reports want to define different behaviour and only work on first row level data (eg acquisition websites, etc)
Data structure looks like
- Label1
  - Date1 (present if comparing date)
    - Segment1 (present if comparing segment)
    - Segment2 (present if comparing segment)
  - Date2 (present if comparing date)
    - Segment1 (present if comparing segment)
    - Segment2 (present if comparing segment)
- Label2
  - ....

To be done:

Add comparison selection to segment selector: We would only allow to compare to other already created segments
In API response I currently set the segment expression in the API output as label but would need to show ideally the segment name if the segment expression is found
Need to automatically expand all rows in html table when comparing data? not sure...
Define how API output could look like when using simple datatable (sparklines, evolution graph)
Support comparison for bar, pie, ... charts
Support comparison for evolution graphs
Support comparison for sparklines
Support comparison ideally in row evolution

Compare segments #7716

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