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  1. MariaDB Server
  2. MDEV-8639

Bad result set when using prefix keys and characters less than space

        Details

        • Type: Bug
        • Status: Open
        • Priority: Major
        • Resolution: Unresolved
        • Affects Version/s: 10.1, 10.0, 5.5
        • Fix Version/s: 10.1
        • Component/s: None
        • Labels:
          None

          Description

          This script correctly returns one row:

          DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET latin1);
INSERT INTO t1 VALUES ('a'),('a\t'),('az'),('b'),('c'),('d'),('e');
SELECT * FROM t1 WHERE a<'a';

          +------+
| a    |
+------+
| a	   |
+------+
1 row in set (0.00 sec)

          Now if I add a prefix index and re-run the select query:

          ALTER TABLE t1 ADD KEY a(a(1));
SELECT * FROM t1 WHERE a<'a';

          it erroneously returns empty set.

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                  • Assignee:
                    bar Alexander Barkov
                    Reporter:
                    bar Alexander Barkov
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                    Dates

                    • Created:
                      Updated: