Github user yucai commented on the issue:
https://github.com/apache/spark/pull/22197
@dongjoon-hyun Sorry for the late response, description is changed to:
> Although filter "ID < 100L" is generated by Spark, it fails to pushdown
into parquet actually, Spark still does the full table scan when reading.
> This PR provides a case-insensitive field resolution to make it work.
Let me know if you have any suggestion :).
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