Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14363
@lianhuiwang Parquet is a little bit different here. We are converting it
to data source tables when inserting rows into Parquet. To get the expected
results, you just need to set `spark.sql.hive.convertMetastoreParquet` to
`false`.
If you are choosing `textfile`, it works as expected.
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