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https://issues.apache.org/jira/browse/PHOENIX-7919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved PHOENIX-7919.
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Resolution: Fixed
> Support EXPLAIN FORMAT JSON
> ---------------------------
>
> Key: PHOENIX-7919
> URL: https://issues.apache.org/jira/browse/PHOENIX-7919
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Andrew Kyle Purtell
> Assignee: Andrew Kyle Purtell
> Priority: Major
> Fix For: PHOENIX-7876-feature
>
>
> {{EXPLAIN (FORMAT JSON) <stmt>}} returns a single VARCHAR cell whose value is
> the Jackson serialization of the in-memory {{ExplainPlanAttributes}} tree. A
> new {{ExplainJsonRenderer}} owns a private static {{ObjectWriter}} configured
> for the EXPLAIN JSON contract and a {{DefaultPrettyPrinter}} whose
> {{DefaultIndenter}} is set on both the object and array indenters, so the
> output is human readable with two space indentation for both objects and
> arrays, {{render(...)}} wraps {{JsonProcessingException}} as
> {{SQLException}}. {{PhoenixStatement#ExecutableExplainStatement.compilePlan}}
> branches on {{getOptions().getFormat()}}. {{TEXT}} is unchanged. {{JSON}}
> skips {{renderTopOfPlanText}} and emits exactly one row carrying the rendered
> document, with the three plan-total estimate cells attached to the first row.
> {{regionLocations}} populates under {{(REGIONS, FORMAT JSON)}} and is
> {{null}} otherwise.
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