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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