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  1. MariaDB Server
  2. MDEV-15123

Make multiple user variable assignment work similar in standalone query and in SP

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    Description

      I run this script:

      SET @a=10;
      		 
      SET @a=20,@b=@a;
      		 
      SELECT @a,@b;


      +------+------+
      		 
      | @a   | @b   |
      		 
      +------+------+
      		 
      |   20 |   10 |
      		 
      +------+------+

      No I wrap the same script into an anonymous SP block:

      DELIMITER $$
      		 
      BEGIN NOT ATOMIC
      		 
      SET @a=10;
      		 
      SET @a=20,@b=@a;
      		 
      SELECT @a,@b;
      		 
      END
      		 
      $$


      +------+------+
      		 
      | @a   | @b   |
      		 
      +------+------+
      		 
      |   20 |   20 |
      		 
      +------+------+

      Notice:

      • in the standalone script @b was assigned to the initial value of @a
      • in the anonymous block @b was assigned to the new value of @a

      We'll make multiple SET inside an SP work the same way with a standalone SET.

      Note, multiple SET for SP variables should also work the same way.

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        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13417 UPDATE produces wrong values if an updated column is later used as an update source

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Task - A task that needs to be done. MDEV-13418 Compatibility: The order of evaluation of SELECT..INTO assignments

          • Major - Major loss of function.
          • Stalled

          Task - A task that needs to be done. MDEV-15122 Simultaneous assignment for LOAD..SET

          • Major - Major loss of function.
          • Open

          Task - A task that needs to be done. MDEV-15124 Simultaneous assignment for INSERT ... SET

          • Major - Major loss of function.
          • Open

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              Unassigned Unassigned
              bar Alexander Barkov
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                Created:
                Updated:

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