Github user mallman commented on the issue:
https://github.com/apache/spark/pull/16797
The proposal to restore schema inference with finer grained control on when
it is performed sounds reasonable to me. The case I'm most interested in is
turning off schema inference entirely, because we do not use parquet files with
upper-case characters in their column names.
BTW, what behavior do we expect if a parquet file has two columns whose
lower-cased names are identical?
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