[GitHub] incubator-carbondata pull request #424: [CARBONDATA-528]support octal escape...

[jackylk <gi...@git.apache.org>]

Github user jackylk commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/424#discussion_r92103661
  
    --- Diff: core/src/main/java/org/apache/carbondata/core/util/CarbonUtil.java ---
    @@ -599,22 +599,7 @@ public static void writeLevelCardinalityFile(String loadFolderLoc, String tableN
        * @return
        */
       public static String unescapeChar(String parseStr) {
    -    switch (parseStr) {
    -      case "\\001":
    -        return "\001";
    -      case "\\t":
    -        return "\t";
    -      case "\\r":
    -        return "\r";
    -      case "\\b":
    -        return "\b";
    -      case "\\f":
    -        return "\f";
    -      case "\\n":
    -        return "\n";
    -      default:
    -        return parseStr;
    -    }
    +    return scala.StringContext.treatEscapes(parseStr);
    --- End diff --
    
    I found the functionality of `treatEscapes` is as following. 
    ```
      /** Expands standard Scala escape sequences in a string.
       *  Escape sequences are:
       *   control: `\b`, `\t`, `\n`, `\f`, `\r`
       *   escape:  `\\`, `\"`, `\'`
       *   octal:   `\d` `\dd` `\ddd` where `d` is an octal digit between `0` and `7`.
       *
       *  @param  str  A string that may contain escape sequences
       *  @return The string with all escape sequences expanded.
       */
    ```
    Do you want to support octal string like \1, \2?
    Adding this functionality is good, my concern is that can you find a java function instead of using scala library? Because generaling speaking, core should not dependent on scala library, they should be pure java implementation. 
    
    Another thing is can you add a testcase for this PR?


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