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  1. MariaDB ColumnStore
  2. MCOL-6148

Semi-joins and correlated subqueries in filters are not processed by QA

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    • 2025-7, 2025-8

    Description

      Consider example:

      set columnstore_unstable_optimizer=on;
      		 
      set @@optimizer_switch='derived_merge=off';
      		 
      select calsettrace(1);
      		 
      select count(*) from lineitem l where exists (select * from lineitem la where 
      l.l_orderkey=la.l_orderkey);

      Here is the actual error that tells either ExistsFilter CSEP is not considered by RBO or JOIN filter predicate is not updated by parallel CSE apply routine.

      MariaDB [test]> select count(*) from lineitem l where exists (select * from lineitem la where 
      l.l_orderkey=la.l_orderkey);
      		 
      ERROR 1815 (HY000): Internal error: MCS-1000: 'sub-query' and 'l, sub-query' are not joined.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MCOL-6327 parallel_ces produces N× inflated results for EXISTS/NOT EXISTS with self-join tables

          • Major - Major loss of function.
          • Closed

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              drrtuy Roman
              drrtuy Roman
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                Updated:
                Resolved:

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