feat: Add utilities for combining dictionary wrappers #11944
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- Adds functions to transpose dictionaries with and without nulls. - Adds projection that wraps children of a RowVector into a dictionary so that dictionaries are combined instead of being nested. If multiple columns have the same wrapping indices, they continue to share the wrapping also after new indices are combined with the previous wrapper. - This is preparation for limiting dictionary wrapping to one level. This will speed up access and simplify corner cases of expressions.
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Adds functions to transpose dictionaries with and without nulls.
Adds projection that wraps children of a RowVector into a dictionary so that dictionaries are combined instead of being nested. If multiple columns have the same wrapping indices, they continue to share the wrapping also after new indices are combined with the previous wrapper.
This is preparation for limiting dictionary wrapping to one level. This will speed up access and simplify corner cases of expressions.