I found a break in GROUPING SETS implementation. Now I am playing with
own executor and planner node and I can't to go forward :(. Probably
this feature will need a significant update of our agg implementation.
Probably needs a some similar structure like CTE but it can be a
little bit reduced - there are a simple relation between source query
and result query - I am not sure, if this has to be implemented via
subqueries? The second question is relative big differencies between
GROUP BY behave and GROUP BY GROUPING SETS behave. Now I don't know
about way to join GROUP BY and GROUPING SETS together

Any ideas welcome



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