[jira] [Created] (SPARK-38314) Fail to read parquet files after writing the hidden file metadata in

["Yaohua Zhao (Jira)" <ji...@apache.org>]

Yaohua Zhao created SPARK-38314:
-----------------------------------

             Summary: Fail to read parquet files after writing the hidden file metadata in
                 Key: SPARK-38314
                 URL: https://issues.apache.org/jira/browse/SPARK-38314
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.2.1
            Reporter: Yaohua Zhao


Selecting and then writing df containing hidden file metadata column `_metadata` into a file format like `parquet`, `delta` will still keep the internal `Attribute` metadata information. Then when reading those `parquet`, `delta` files again, it will actually break the code, because it wrongly thinks user data schema named `_metadata` is a hidden file source metadata column.

 

Reproducible code:

```

// prepare a file source df

df.select("*", "_metadata")
  .write.format("parquet").save(path)

spark.read.format("parquet").load(path)
  .select("*").show()

```



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