adriangb commented on PR #25342:
URL: https://github.com/apache/datafusion/pull/25342#issuecomment-5699122690

   @adragomir I looked for ways to minimize the diff / churn but all of the 
changes here seem worth it. In particular on keeping main's structure and only 
routing Map through a new function, that would mean keeping the throwaway 
single-field Schema built per nested level (that's the 17285 → 5588 ns in 
https://github.com/apache/datafusion/pull/25342#discussion_r4027087595, and it 
would stay on the slow side). The unreachable match arm that was the single 
uncovered line in 
[#25193](https://github.com/pydantic/datafusion/issues/25193)'s codecov report, 
and the name-matching that map entries can't use anyway (Map has to come out of 
that grouped or-pattern either way, since its children match by position).


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