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  1. MariaDB ColumnStore
  2. MCOL-4991

TRUNCATE/ROUND/CEILING functions on TIMESTAMP/DATETIME columns with microsecond precision produce incorrect results.

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    Details

    • Type: Bug
    • Status: Open (View Workflow)
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 6.2.1
    • Fix Version/s: 22.08
    • Component/s: PrimProc
    • Labels:
      None
    • Sprint:
      2021-17

      Description

      MariaDB [test]> create table t1 (a timestamp(6), b datetime(6))engine=columnstore;
      Query OK, 0 rows affected (0.233 sec)
       
      MariaDB [test]> insert into t1 values ('2022-01-02 11:13:15.123456', '2022-01-01 12:14:16.789456');
      Query OK, 1 row affected (0.195 sec)
       
      MariaDB [test]> insert into t1 values ('2022-01-01 12:14:16.789456', '2022-01-02 11:13:15.123456');
      Query OK, 1 row affected (0.167 sec)
       
      MariaDB [test]> create table i1 as select * from t1;
      Query OK, 2 rows affected (0.055 sec)
      Records: 2  Duplicates: 0  Warnings: 0
      

      CEILING on TIMESTAMP/DATETIME columns in CS:

      MariaDB [test]> select a, b, ceiling(a), ceiling(b) from t1;
      +----------------------------+----------------------------+---------------------+---------------------+
      | a                          | b                          | ceiling(a)          | ceiling(b)          |
      +----------------------------+----------------------------+---------------------+---------------------+
      | 2022-01-02 11:13:15.123456 | 2022-01-01 12:14:16.789456 | 2022-01-02 11:13:15 | 2022-01-01 12:14:16 |
      | 2022-01-01 12:14:16.789456 | 2022-01-02 11:13:15.123456 | 2022-01-01 12:14:16 | 2022-01-02 11:13:15 |
      +----------------------------+----------------------------+---------------------+---------------------+
      2 rows in set (0.027 sec)
      

      CEILING on TIMESTAMP/DATETIME columns in InnoDB:

      MariaDB [test]> select a, b, ceiling(a), ceiling(b) from i1;
      +----------------------------+----------------------------+---------------------+---------------------+
      | a                          | b                          | ceiling(a)          | ceiling(b)          |
      +----------------------------+----------------------------+---------------------+---------------------+
      | 2022-01-02 11:13:15.123456 | 2022-01-01 12:14:16.789456 | 2022-01-02 11:13:16 | 2022-01-01 12:14:17 |
      | 2022-01-01 12:14:16.789456 | 2022-01-02 11:13:15.123456 | 2022-01-01 12:14:17 | 2022-01-02 11:13:16 |
      +----------------------------+----------------------------+---------------------+---------------------+
      2 rows in set (0.001 sec)
      

      TRUNCATE on DATETIME column in CS:

      MariaDB [test]> select b, truncate(b, -2), truncate(b, 0), truncate(b, 2) from t1;
      +----------------------------+---------------------+---------------------+------------------------+
      | b                          | truncate(b, -2)     | truncate(b, 0)      | truncate(b, 2)         |
      +----------------------------+---------------------+---------------------+------------------------+
      | 2022-01-01 12:14:16.789456 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00.00 |
      | 2022-01-02 11:13:15.123456 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00.00 |
      +----------------------------+---------------------+---------------------+------------------------+
      2 rows in set (0.024 sec)
      

      TRUNCATE on DATETIME column in InnoDB:

      MariaDB [test]> select b, truncate(b, -2), truncate(b, 0), truncate(b, 2) from i1;
      +----------------------------+---------------------+---------------------+------------------------+
      | b                          | truncate(b, -2)     | truncate(b, 0)      | truncate(b, 2)         |
      +----------------------------+---------------------+---------------------+------------------------+
      | 2022-01-01 12:14:16.789456 | 2022-01-01 12:14:16 | 2022-01-01 12:14:16 | 2022-01-01 12:14:16.78 |
      | 2022-01-02 11:13:15.123456 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15.12 |
      +----------------------------+---------------------+---------------------+------------------------+
      2 rows in set (0.001 sec)
      

      ROUND on TIMESTAMP column in CS:

      MariaDB [test]> select a, round(a, -2), round(a, 0), round(a, 2) from t1;
      +----------------------------+---------------------+---------------------+------------------------+
      | a                          | round(a, -2)        | round(a, 0)         | round(a, 2)            |
      +----------------------------+---------------------+---------------------+------------------------+
      | 2022-01-02 11:13:15.123456 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15.12 |
      | 2022-01-01 12:14:16.789456 | 2022-01-01 12:14:16 | 2022-01-01 12:14:16 | 2022-01-01 12:14:16.78 |
      +----------------------------+---------------------+---------------------+------------------------+
      2 rows in set (0.021 sec)
      

      ROUND on TIMESTAMP column in InnoDB:

      MariaDB [test]> select a, round(a, -2), round(a, 0), round(a, 2) from i1;
      +----------------------------+---------------------+---------------------+------------------------+
      | a                          | round(a, -2)        | round(a, 0)         | round(a, 2)            |
      +----------------------------+---------------------+---------------------+------------------------+
      | 2022-01-02 11:13:15.123456 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15.12 |
      | 2022-01-01 12:14:16.789456 | 2022-01-01 12:14:17 | 2022-01-01 12:14:17 | 2022-01-01 12:14:16.79 |
      +----------------------------+---------------------+---------------------+------------------------+
      2 rows in set (0.001 sec)
      

      ROUND on DATETIME column in CS:

      MariaDB [test]> select b, round(b, -2), round(b, 0), round(b, 2) from t1;
      +----------------------------+---------------------+---------------------+------------------------+
      | b                          | round(b, -2)        | round(b, 0)         | round(b, 2)            |
      +----------------------------+---------------------+---------------------+------------------------+
      | 2022-01-01 12:14:16.789456 | 2022-01-01 12:14:16 | 2022-01-01 12:14:16 | 2022-01-01 12:14:16.78 |
      | 2022-01-02 11:13:15.123456 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15.12 |
      +----------------------------+---------------------+---------------------+------------------------+
      2 rows in set (0.020 sec)
      

      ROUND on DATETIME column in InnoDB:

      MariaDB [test]> select b, round(b, -2), round(b, 0), round(b, 2) from i1;
      +----------------------------+---------------------+---------------------+------------------------+
      | b                          | round(b, -2)        | round(b, 0)         | round(b, 2)            |
      +----------------------------+---------------------+---------------------+------------------------+
      | 2022-01-01 12:14:16.789456 | 2022-01-01 12:14:17 | 2022-01-01 12:14:17 | 2022-01-01 12:14:16.79 |
      | 2022-01-02 11:13:15.123456 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15 | 2022-01-02 11:13:15.12 |
      +----------------------------+---------------------+---------------------+------------------------+
      2 rows in set (0.001 sec)
      

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            Assignee:
            tntnatbry Gagan Goel
            Reporter:
            tntnatbry Gagan Goel
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              Dates

              Created:
              Updated:

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