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https://issues.apache.org/jira/browse/SPARK-22230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shixiong Zhu resolved SPARK-22230.
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Resolution: Fixed
> agg(last('attr)) gives weird results for streaming
> --------------------------------------------------
>
> Key: SPARK-22230
> URL: https://issues.apache.org/jira/browse/SPARK-22230
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.2.0
> Reporter: Jose Torres
> Priority: Minor
> Fix For: 2.3.0
>
>
> In stream aggregation, last('attr) yields the last value from the first
> microbatch forever. I'm not sure if it's fair to call this a correctness bug,
> since last doesn't have strong correctness semantics, but ignoring all rows
> past the first microbatch is at least weird.
> Simple repro in StreamingAggregationSuite:
> val input = MemoryStream[Int]
> val aggregated = input.toDF().agg(last('value))
> testStream(aggregated, OutputMode.Complete())(
> AddData(input, 1, 2, 3),
> CheckLastBatch(3),
> AddData(input, 4, 5, 6),
> CheckLastBatch(6) // actually yields 3 again
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