Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20906#discussion_r179685434
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/writer/streaming/StreamWriter.java
---
@@ -29,14 +31,15 @@
* increasing numeric ID. This writer handles commits and aborts for each
successive epoch.
*/
@InterfaceStability.Evolving
-public interface StreamWriter extends DataSourceWriter {
--- End diff --
By design we would create more mix-in interfaces for `DataSourceWriter`,
like `SupportsWriteColumnarBatch`. If the `StreamWriter` doesn't extend
`DataSourceWriter`, how shall we apply those mix-in interfaces for
`StreamWriter`?
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