Github user brkyvz commented on the issue:
https://github.com/apache/spark/pull/16030
@maropu I wouldn't say this is a regression. I would say that this working
for 2.0.2 was a bug in 2.0.2. If you want the column `a` to be interpreted as a
`LongType` instead of `IntegerType`, you should provide the schema with
`df.read.schema(schemaWhereAIsLong).parquet("path")`
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