shizy818 commented on code in PR #16353:
URL: https://github.com/apache/iotdb/pull/16353#discussion_r2645087594
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iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/common/MPPQueryContext.java:
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@@ -103,6 +125,24 @@ public class MPPQueryContext implements IAuditEntity {
private boolean userQuery = false;
+ private Map<NodeRef<Table>, Query> cteQueries = new HashMap<>();
+
+ // Stores the EXPLAIN/EXPLAIN ANALYZE results for Common Table Expressions
(CTEs)
+ // Key: CTE table reference
+ // Value: Pair containing (max line length of the explain output, list of
formatted explain lines)
+ // This ensures consistent formatting between the main query and its CTE
sub-queries
+ private final Map<NodeRef<Table>, Pair<Integer, List<String>>>
cteExplainResults =
+ new LinkedHashMap<>();
+ // Tracks the materialization time cost (in nanoseconds) for each CTE to
help optimize query
+ // planning
+ private final Map<NodeRef<Table>, Long> cteMaterializationCosts = new
HashMap<>();
+
+ // Never materialize CTE in a subquery.
+ private boolean subquery = false;
Review Comment:
I just mean subquery. It is used in `createOutputPlan`, `createRelationPlan`
and `createRelationPlan`. As long as it's subquery, I think the logic is same.
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