Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17758
Hi @maropu , I just did some simple search, and found many other places
also related to duplicate columns. e.g. `InsertIntoHadoopFsRelationCommand`,
`PartitioningUtils.normalizePartitionSpec`, `SessionCatalog.alterTableSchema`.
Can you do a more comprehensive search to find if there are other places
missed? Let's make all of them consistent as best as we can.
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