Github user arunmahadevan commented on the issue:
https://github.com/apache/spark/pull/21721
@rxin its for streaming sources and sinks as explained in the [doc](
https://github.com/apache/spark/blob/master/sql/core/src/main/java/org/apache/spark/sql/sources/v2/CustomMetrics.java#L23)
It had to be shared between classes in reader.streaming and
writer.streaming, so was added in the parent package (similar to other
streaming specific classes that exists here like
[StreamingWriteSupportProvider.java
](https://github.com/apache/spark/blob/master/sql/core/src/main/java/org/apache/spark/sql/sources/v2/StreamingWriteSupportProvider.java)
[MicroBatchReadSupportProvider.java](https://github.com/apache/spark/blob/master/sql/core/src/main/java/org/apache/spark/sql/sources/v2/MicroBatchReadSupportProvider.java))
we could move all of it to a streaming package.
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