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  1. MariaDB Server
  2. MDEV-20085

Negative count causes SQL repeat() to set expected result length to 16MB instead of 0

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Minor
    • Resolution: Fixed
    • 10.5, 10.4(EOL)
    • 10.3.18
    • Data types
    • None

    Description

      There is an incorrect result item length assigned when a negative repeat() counter used. Here is the assignement when we implicitly cast signed to unsigned getting overflow if count < 0. Later MDB assignes 16MB inside fix_char_length_ulonglong(). This causes a crash in CS. Here are the steps to reproduce.

      create table cs1(i bigint)engine=columnstore;
      		 
      insert into cs1 values (42);
      		 
      select repeat(i,-1) from cs1;

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          blocks

          New Feature - A new feature of the product, which has yet to be developed. MCOL-2178 Run CS with vanilla 10.4

          • Major - Major loss of function.
          • Closed
          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20292 REPEAT(x,-1) returns a wrong data type

          • Major - Major loss of function.
          • Closed

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            People

              bar Alexander Barkov
              drrtuy Roman
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              Dates

                Created:
                Updated:
                Resolved:

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