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  1. MariaDB Server
  2. MDEV-13119

Wrong results with CAST(AS CHAR) and subquery

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    Description

      This problem is similar to MDEV-10306

      This script:

      SET optimizer_switch=_utf8'derived_merge=on';
      		 
      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (t VARCHAR(10) CHARSET latin1);
      		 
      INSERT INTO t1 VALUES('abcdefghi');
      		 
      SELECT CONCAT(t2,'-',t2) c2 FROM (SELECT CAST(t AS CHAR CHARACTER SET utf8) t2 FROM t1) sub;

      returns a wrong result:

      +--------------------+
      		 
      | c2                 |
      		 
      +--------------------+
      		 
      | abcdefghiabcdefghi |
      		 
      +--------------------+

      Notice, there is no the expected dash character in the result.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13120 Wrong results with MAKE_SET() and subquery

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13790 UNHEX() of a somewhat complicated CONCAT() returns NULL

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-10306 Wrong results with combination of CONCAT, SUBSTR and CONVERT in subquery

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              bar Alexander Barkov
              bar Alexander Barkov
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