[jira] [Created] (TAJO-230) Support unicode identifiers

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-230:
---------------------------------

             Summary: Support unicode identifiers
                 Key: TAJO-230
                 URL: https://issues.apache.org/jira/browse/TAJO-230
             Project: Tajo
          Issue Type: New Feature
          Components: parser
            Reporter: Hyunsik Choi


The current parse only recognizes a combination of alphabet characters and underscore as an identifier used for function names, column names, and table names. This is because of the following antlr lexer rules:
{code}
Identifier
  : Nonreserved_keywords
  | Regular_Identifier
  ;

Regular_Identifier
  : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|Digit|'_')*
  ;
{code}

In some CJK country, their characters can be used as identifiers. We need to support unicode identifier.



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