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  1. MariaDB Server
  2. MDEV-40680

MIN()/MAX() over BIGINT UNSIGNED loses the UNSIGNED flag when converted to a float

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Details

    • Unexpected results
    • Q4/2026 Server Development

    Description

      The following scripts demonstrate this inconsistency, which might be unexpected

      CREATE TABLE t (sh BIGINT UNSIGNED, g INT);
      		 
      INSERT INTO t VALUES (18446744073709551588, 1);   -- 2^64 - 28
      		 
       
      		 
      SELECT MIN(sh)                  FROM t;   -- 18446744073709551588        correct
      		 
      SELECT CAST(sh AS DOUBLE)       FROM t;   -- 1.8446744073709552e+19      correct (no aggregate)
      		 
      SELECT CAST(MIN(sh) AS DOUBLE)  FROM t;   -- -28.0                       WRONG
      		 
      SELECT MIN(sh) + 0e0            FROM t;   -- -28.0                       WRONG (no CAST needed)
      		 
      SELECT SQRT(MIN(sh))            FROM t;   -- NULL   (expected 4294967296) WRONG

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-41381 BIGINT UNSIGNED value >= 2^63 is returned by both IN (subquery) and NOT IN (subquery) against a DOUBLE column

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-41486 Inconsistent result: "a.x <= b.y" is true in EXISTS but the equivalent JOIN returns no row (REAL vs BIGINT UNSIGNED, Range checked for each record)

          • Major - Major loss of function.
          • Confirmed

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              raghunandan.bhat Raghunandan Bhat
              jesse0623 Junwen An
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