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https://issues.apache.org/jira/browse/PHOENIX-8050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell updated PHOENIX-8050:
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Summary: Selective queries can underreport scan metrics (was: Highly
selective queries can underreport scan metrics)
> Selective queries can underreport scan metrics
> ----------------------------------------------
>
> Key: PHOENIX-8050
> URL: https://issues.apache.org/jira/browse/PHOENIX-8050
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 5.3.2
> Reporter: Andrew Kyle Purtell
> Assignee: Andrew Kyle Purtell
> Priority: Major
> Fix For: 5.4.0, 5.3.3
>
>
> Top-N and offset scanners pre-read rows at initialization, recording their
> scan metrics in a local context intended for HBase's RPC response. {{next()}}
> checks {{isFilterDone()}} before merging this local context into the active
> RPC context, so if all rows in a region are filtered out during scanner
> setup, {{next()}} exits immediately, discarding those initialization metrics
> before they can be recorded.
> As a result, queries that filter out entire regions severely underreport scan
> metrics such as {{ROWS_SCANNED}} and {{{}ROWS_FILTERED{}}}.
> The fix flushes the initialization metrics into the RPC context before
> checking {{{}isFilterDone(){}}}. This ensures scan metrics accounting is
> accurate across empty regions while preserving early-exit behavior and query
> results.
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