Jose Torres created SPARK-22230:
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Summary: 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
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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