Github user marmbrus commented on a diff in the pull request:
    --- Diff: 
    @@ -49,7 +49,7 @@ class ConsoleSink(options: Map[String, String]) extends 
Sink with Logging {
         // scalastyle:off println
    -      data.sparkSession.sparkContext.parallelize(data.collect()), 
    --- End diff --
    This might not be safe unfortunately.  Anything that changes the query plan 
might cause it to get replanned (and we don't do this correctly).
    Can you make sure that there is a test case that uses the console sink and 
does aggregation across more than one batch?

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