Github user budde commented on the issue:
https://github.com/apache/spark/pull/16944
@dongjoon-hyun This problem is happening because
[```HiveMetastoreCatalog.mergeWithMetastoreSchema()```](https://github.com/apache/spark/blob/master/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala#L350-L376)
doesn't maintain the ```StructType``` field order returned by the metastore. I
overlooked that the ordering of the schema must be maintained. I'll open a new
PR to correct this and add tests where appropriate.
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