Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/14680 @jaceklaskowski It seems the test [here] (https://github.com/apache/spark/blob/e50efd53f073890d789a8448f850cc219cca7708/sql/core/src/test/scala/org/apache/spark/sql/streaming/FileStreamSourceSuite.scala#L715-L724) is related with this change. It seems it will passes the test if we change `TextFileFormat` to `TEXT`. BTW, how about changing them to `Parquet` and `Text` maybe? I believe this might be about personal taste though.. I feel like `shortName.toUpperCase` is not always the string representation of each data source. I mean.. if my understanding is correct, the proper name might be `Parquet` rather than `PARQUET`, at least. It seems `ORC`, `JSON` and `CSV` are correct names because they are abbreviated names but I feel like it is questionable for `PARQUET` and `TEXT`. If the purpose of this change is only to see the information about plans to human via `explain(...)` regardless of anything, it might be better if it is more close to human readable and correct names as string representation. This is just my personal opinion. I think we need @rxin 's sign off here.
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