gengliangwang opened a new pull request #24356: [SPARK-27448][SQL] File source V2 table provider should be compatible with V1 provider URL: https://github.com/apache/spark/pull/24356 ## What changes were proposed in this pull request? In the rule `PreprocessTableCreation`, if an existing table is appended with a different provider, the action will fail. Currently, there are two implementations for file sources and creating a table with file source V2 will always fall back to V1 FileFormat. We should consider the following cases as valid: 1. Appending a table with file source V2 provider using the v1 file format 2. Appending a table with v1 file format provider using file source V2 format ## How was this patch tested? Unit test
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