feat: AggregateRel should use grouping references

[srikrishnak]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 36 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@18b7daf). Learn more about missing BASE report.
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
plan/plan.go	30.23%	30 Missing ⚠️
plan/builders.go	96.77%	2 Missing and 1 partial ⚠️
plan/relations.go	91.42%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #94   +/-   ##
=======================================
  Coverage        ?   62.48%           
=======================================
  Files           ?       44           
  Lines           ?    10148           
  Branches        ?        0           
=======================================
  Hits            ?     6341           
  Misses          ?     3523           
  Partials        ?      284           

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