gortiz opened a new pull request, #18752:
URL: https://github.com/apache/pinot/pull/18752

   ## Summary
   
   `Spool.json` in the multi-stage `ResourceBasedQueriesTest` previously 
covered a single spool shape (a table scanned once and joined twice). This adds 
three more so the spool (`useSpools=true`) reuse path is exercised across 
common reuse patterns:
   
   - a stage reused by **three** downstream stages (one scan, joined three 
times);
   - an **aggregated** stage reused by a self join;
   - an aggregated stage reused by both arms of a **UNION ALL**.
   
   Each query has an `h2Sql` equivalent, so the results are validated against 
H2.
   
   ## Testing
   
   `mvn -pl pinot-query-runtime test -Dtest=ResourceBasedQueriesTest 
-Dpinot.fileFilter=Spool` — all spool cases pass.


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