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https://issues.apache.org/jira/browse/PHOENIX-7918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved PHOENIX-7918.
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Resolution: Fixed
> Implement EXPLAIN VERBOSE disclosures
> -------------------------------------
>
> Key: PHOENIX-7918
> URL: https://issues.apache.org/jira/browse/PHOENIX-7918
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Andrew Kyle Purtell
> Assignee: Andrew Kyle Purtell
> Priority: Major
> Fix For: PHOENIX-7876-feature
>
>
> Introduce {{EXPLAIN (VERBOSE)}} mode with three related disclosures: a
> {{PROJECT}} line, predicate source attribution on every {{SERVER FILTER BY}}
> / {{CLIENT FILTER BY}} line, and ignored hint comments.
> The {{verbose}} flag is read from {{ExplainOptions}} by
> {{PhoenixStatement.ExecutableExplainStatement}} and threaded onto
> {{StatementContext}} so {{ExplainTable.explain(...)}} can branch on it.
> {{ExplainTable}} reads the post-compile projector via
> {{plan.getProjector().getColumnProjectors()}} (skipped when null) and
> {{ExplainPlanAttributes}} gains {{serverProject : List}}, populated whenever
> known and gated by VERBOSE.
> The per-scan {{!INDEX}} text rendering wired by PHOENIX-7891 (and consumed by
> PHOENIX-7903 for the {{path expression does not match}} reason) is gated
> behind {{verbose}}. The chosen-plan {{INDEX}} line stays in plain
> {{EXPLAIN}}, and the {{indexRejected}} attribute keeps populating regardless
> of mode. PHOENIX-7891 connectionless {{ExplainPlanTest}} cases that asserted
> on {{!INDEX}} text are migrated to assert on the structured {{indexRejected}}
> attribute or switched to {{EXPLAIN (VERBOSE)}}, and the affected
> plain-{{EXPLAIN}} baselines are regenerated.
> Every {{Expression}} rewriter that produces a fresh node inherits input tags
> so identity-keyed lookup survives deep clones. Under VERBOSE {{ExplainTable}}
> walks the top-level filter expression and, if it is an {{AndExpression}}
> whose children are each in the origin map, emits one {{SERVER FILTER BY}} per
> child, or otherwise a single line with the comma-separated union of origins.
> {{StatementContext}} adds {{predicateOrigins : Map<Expression, Set>}} keyed
> by {{IdentityHashMap}} with {{tagPredicate(Expression, String)}} and
> {{getPredicateOrigins()}} accessors that is wired into {{WhereCompiler}}
> ({{"WHERE"}} per AND-child, with {{WhereOptimizer}} row-key-range /
> residual-server-filter splits inheriting origins and partial-evaluation
> fusion unioning the sets), {{HavingCompiler}} ({{"HAVING (lifted)"}}),
> {{JoinCompiler}} ({{"JOIN ON"}} for surviving ON predicates and
> {{"decorrelated from "}} from the rewriter context),
> {{IndexStatementRewriter}} ({{"INDEX WHERE"}}), and {{RVCOffsetCompiler}}
> ({{"RVC OFFSET"}}).
> For path-test functions ({{JsonExistsFunction}},
> {{BsonConditionExpressionFunction}}) {{(JSON EXISTS)}} / {{(BSON CONDITION)}}
> is appended to the trailing comment, detected by expression class.
> {{ExplainPlanAttributes}} adds {{serverFilters : List<expr, origin : List,
> pathTestSubtag : String>}} alongside the existing {{serverWhereFilter}}
> narrowed by PHOENIX-7886.
> For ignored-hint comments, {{StatementContext}} adds {{Map<Hint,
> IgnoredHintReason>}} populated at sites involving the {{HintNode.Hint}} set —
> {{Hint.NO_INDEX}} in {{QueryOptimizer.getApplicablePlansForSingleFlatQuery}},
> {{Hint.USE_SORT_MERGE_JOIN}} in {{JoinCompiler.useSortMergeJoin}},
> {{Hint.SMALL}} in {{ExplainTable.explain}} — and {{ExplainTable}} emits one
> {{/- HINT(args) -- */}} comment per ignored hint under VERBOSE in the
> per-scan render order. Partially honored hints (e.g. {{INDEX(t a, b)}} where
> only {{a}} was used) are treated as honored if any arg was used.
> Matching {{ExplainPlanTestUtil}} fluent getters, setters, and testers are
> added for {{serverProject}}, {{serverFilters}}, and the ignored-hint map.
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