[GitHub] [spark] cloud-fan edited a comment on issue #25651: [SPARK-28948][SQL] Support passing all Table metadata in TableProvider

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cloud-fan edited a comment on issue #25651: [SPARK-28948][SQL] Support passing all Table metadata in TableProvider
URL: https://github.com/apache/spark/pull/25651#issuecomment-544927711
 
 
   I was not trying to define the behavior, but talking about the existing behavior. `df.write.mode("append").parquet("path_with_existing_data")` will not do schema/partition inference, and just append the data even if the schema is incompatible. The following read will fail during schema inference. I think this is a reasonable behavior, as there is no "user-specified schema" in `DataFrameWriter` to skip schema inference.

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