Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/17680
There's an open PR ([#361](https://github.com/apache/parquet-mr/pull/361)),
to support quoted column names, but the discussion on the merits of it is
on-going. I don't see a huge benefit to supporting `.` in column names, and I'm
concerned that it breaks readers like parquet-avro that specifically don't
allow them. More discussion from the Spark community is welcome there.
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