Github user vackosar commented on a diff in the pull request: https://github.com/apache/spark/pull/21919#discussion_r210708107 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/streaming/progress.scala --- @@ -254,3 +259,10 @@ class SinkProgress protected[sql]( } } } + +private[sql] object SinkProgress { + val DEFAULT_NUM_OUTPUT_ROWS: Long = -1L --- End diff -- I will implement this for continuous streaming and then only legacy sinks would output -1. I didn't wanted to change the API too often.
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