Github user yhuai commented on the issue:
https://github.com/apache/spark/pull/13546
I think we cannot ban the format when the append is used in
`DataFrameWriter`. For example, when I use `createDF(10,
19).write.mode(SaveMode.Append).format("text").saveAsTable("appendJsonToText")`,
I expect it uses text to create the data initially. Then, it is reasonable to
expect that this code still work when we want to append data.
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