Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/15398
  
    As @jodersky said, SQL2003 syntax is like
    ```
    WHERE expression [NOT] LIKE string_pattern [ESCAPE escape_sequence]
    ```
    ```
    - ESCAPE escape_sequence
    Allows you to search for the presence of characters that would normally be 
interpreted as wildcards.
    ```
    
    @yhuai @rxin Should we allow users to specify the ESCAPE characters? Thanks!


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