Yida Wu created IMPALA-12960:
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Summary: Incorrect RowsPassedThrough Metric in Streaming
Aggregation
Key: IMPALA-12960
URL: https://issues.apache.org/jira/browse/IMPALA-12960
Project: IMPALA
Issue Type: Bug
Components: Backend
Reporter: Yida Wu
Assignee: Yida Wu
The logic in grouping aggregation uses the row number of the output batch as
the number of the current aggregator returning, however the output batch is
shared with other aggregators in streaming aggregation and may not necessarily
start at 0 initially, this can result in incorrect numbering and subsequently
affect the accuracy of the RowsPassedThrough metric.
https://github.com/apache/impala/blob/f55077007bf68e6cbeaa15cf270c333af847a1f1/be/src/exec/grouping-aggregator.cc#L519
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