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https://issues.apache.org/jira/browse/PHOENIX-7936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved PHOENIX-7936.
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Resolution: Fixed
> EXPLAIN the user's projection on server-driven mutation inner plans
> -------------------------------------------------------------------
>
> Key: PHOENIX-7936
> URL: https://issues.apache.org/jira/browse/PHOENIX-7936
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Andrew Kyle Purtell
> Assignee: Andrew Kyle Purtell
> Priority: Major
> Fix For: PHOENIX-7876-feature
>
>
> Server-side {{UPSERT SELECT}} and {{DELETE}} compile their inner scan as an
> aggregating {{SELECT COUNT(1)}} whose count reports how many rows were
> touched. Under {{EXPLAIN (VERBOSE)}} that internal rewrite leaked as a
> misleading {{PROJECT COUNT(1)}} line (and {{serverProject: ["COUNT(1)"]}} in
> JSON) on the inner scan rather than describing the mutation. {{ExplainTable}}
> factors the per-scan {{PROJECT}} naming into a reusable static
> {{projectedColumnNames(RowProjector)}} and adds
> {{{}overrideMutationProject{}}}, which rewrites the {{serverProject}}
> attribute with the user-facing projection for {{UPSERT SELECT}} and
> {{{}DELETE{}}}.
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