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https://issues.apache.org/jira/browse/SPARK-45815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-45815.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 43692
[https://github.com/apache/spark/pull/43692]
> 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, Structured Streaming
> Affects Versions: 3.5.1
> Reporter: Yaohua Zhao
> Assignee: Yaohua Zhao
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> 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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