Обсуждение: TupleTable like data structure

I'm writing my own /Group by/ operator (non-hashed implementation) and I'm
currently looking on a good data structure to store the result groups. There
are two requirement in my mind: the table need to be efficiently expanded
and the tuples within each group need to be sorted.

I carefully examined the implementation of standard /Group by/ (both hashed
and sorted implementation), the closest I got is to leverage parts of the
/TupleHashTable/ but before going through this plan, I need to make sure I'm
not overlooking an existing data structure.

Thanks



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