Yaohua Zhao created SPARK-45815:
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Summary: Provide an interface for Streaming sources to add
_metadata columns
Key: SPARK-45815
URL: https://issues.apache.org/jira/browse/SPARK-45815
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.5.1
Reporter: Yaohua Zhao
Currently, only the native V1 file-based streaming source can read the
`_metadata`{{{}{}}} column:
https://github.com/apache/spark/blob/370870b7a0303e4a2c4b3dea1b479b4fcbc93f8d/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingRelation.scala#L63
Our goal is to create an interface that allows other streaming sources to add
`{{{}_metadata`{}}} columns. For instance, we would like the Delta Streaming
source, which you can find here:
[https://github.com/delta-io/delta/blob/master/spark/src/main/scala/org/apache/spark/sql/delta/sources/DeltaDataSource.scala#L49],
to extend this interface and provide the `{{{}_metadata`{}}} column for its
underlying storage format, such as Parquet.
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