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  1. MariaDB Server
  2. MDEV-28621

group by optimization incorrectly removing subquery where subject buried in a function

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Details

    • Bug
    • Status: Stalled (View Workflow)
    • Blocker
    • Resolution: Unresolved
    • 10.3.35, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 10.10, 10.11, 11.4
    • 10.4, 10.5, 10.6, 10.11, 11.0, 11.1, 11.2, 11.3, 11.4
    • None
    • ubuntu 18.04

    Description

      poc:

      CREATE TABLE v1169 ( v1170 FLOAT NOT NULL ) ;
       INSERT INTO v1169 ( v1170 ) VALUES ( 40 ) ;
       UPDATE v1169 SET v1170 = -2147483648 WHERE v1170 = 5 ;
       INSERT INTO v1169 ( v1170 ) VALUES ( -128 ) , ( 52 ) ;
       WITH v1172 AS ( SELECT v1170 FROM ( SELECT v1170 FROM v1169 GROUP BY v1170 ) AS v1171 ) SELECT v1170 FROM v1172 WHERE v1170 BETWEEN FALSE AND ( ( ( v1170 OR NOT v1170 ) BETWEEN ( ( ( NOT ( ( 90778113.000000 ^ 90656932.000000 AND ( v1170 NOT IN ( NOT ( NOT ( 'x' = TRUE AND v1170 = 61 ) ) ) AND v1170 IN ( ( SELECT v1170 FROM v1169 WHERE ( FALSE <= -128 BETWEEN 10 AND 34 , v1170 ) IN ( WITH v1176 AS ( SELECT v1174 FROM ( SELECT ( SELECT v1170 FROM ( SELECT ( v1170 NOT IN ( 11097710.000000 , 12206111.000000 NOT BETWEEN 'x' AND 'x' ) AND v1170 NOT IN ( 2147483647 % v1170 ) ) , CASE WHEN v1170 % 30004927.000000 THEN 'x' ELSE v1170 END / 46 FROM v1169 UNION SELECT v1170 , v1170 FROM v1169 ) AS v1173 ) * 0 AS v1174 FROM v1169 ) AS v1175 ) SELECT ( v1174 NOT IN ( ( NOT ( 'x' / v1174 = v1174 + CASE v1174 WHEN 0 THEN v1174 ELSE ( WITH RECURSIVE v1177 ( v1178 ) AS ( SELECT v1170 FROM v1169 ) SELECT 81155100.000000 AS v1179 FROM v1177 ORDER BY v1178 DESC LIMIT 1 OFFSET 1 ) - 0 END AND v1174 = 'x' ) ) IS NULL ) AND v1174 NOT IN ( 33 ^ v1174 ) ) , v1174 + v1174 FROM v1176 GROUP BY v1174 ) ) * 2147483647 ) ) = -32768 ) * NULL ) ) ) ) AND 719937.000000 ) ) ;
      

      output:
      mysqld: /sql/item_subselect.cc:766: virtual bool Item_subselect::exec(): Assertion `!eliminated' failed.

      The full error log is in the attachment.

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              Johnston Rex Johnston
              nobody Shihao Wen
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              Dates

                Created:
                Updated:

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