Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/15398
  
    Checked Oracle. Oracle has the same behavior like DB2:
    ```
    SQL> SELECT USERNAME FROM ALL_USERS WHERE USERNAME LIKE '%P%\' ESCAPE '\';
    SELECT USERNAME FROM ALL_USERS WHERE USERNAME LIKE '%P%\' ESCAPE '\'
                                                       *
    ERROR at line 1:
    ORA-01424: missing or illegal character following the escape character
    
    
    SQL> SELECT USERNAME FROM ALL_USERS WHERE USERNAME LIKE '%P%\a' ESCAPE '\';
    SELECT USERNAME FROM ALL_USERS WHERE USERNAME LIKE '%P%\a' ESCAPE '\'
                                                       *
    ERROR at line 1:
    ORA-01424: missing or illegal character following the escape character
    ```


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