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https://issues.apache.org/jira/browse/KYLIN-5817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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pengfei.zhan resolved KYLIN-5817.
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Resolution: Fixed
> After sending the query, the number of scanRows and scanBytes in response are
> inaccurate
> ----------------------------------------------------------------------------------------
>
> Key: KYLIN-5817
> URL: https://issues.apache.org/jira/browse/KYLIN-5817
> Project: Kylin
> Issue Type: Improvement
> Components: Query Engine
> Affects Versions: 5.0-beta
> Reporter: Zhimin Wu
> Assignee: Zhimin Wu
> Priority: Major
> Fix For: 5.0.0
>
>
> h3. Background
> When KE calls the query interface, it is found that the scan row count
> {{scanRows}} and scan byte count {{scanBytes}} in the response are not
> accurate.
> h3. Root Cause
> The query interface internally calls the
> {{collectAdaptiveSparkPlanExecMetrics}} method of {{{}QueryMetricUtils{}}}.
> When iterating through {{{}exec.children.foreach{}}}, if the {{child}} is a
> {{{}SparkPlan{}}}, each time the results of the new {{child}} overwrite the
> {{newScanRow}} and {{newScanBytes}} variables without adding them up.
> h3. Dev Design
> To address the issue, replace the assignment operator {{=}} with the compound
> addition assignment operator {{+=}} to ensure that the results are properly
> accumulated. This change will allow for the correct aggregation of scan row
> count and scan byte count in each iteration.
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