Github user mallman commented on the issue:
https://github.com/apache/spark/pull/14690
@ericl That would be ideal, however the Hive metastore does not faithfully
record column names with upper case characters. So if you save a parquet file
with a column named `myCol` and define an external Hive table over it with a
column named `myCol` Hive will not respect the case sensitive column name. When
reading the schema from the metastore the column name will be `mycol` and Spark
will fail to find that column from the parquet file.
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