删除无用代码

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@127 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/sql/parser/Lexer.java

@@ -248,7 +248,7 @@ public class Lexer {
                     throw new SQLParseException("TODO"); // TODO
                 case '@':
                     scanVariable();
-                    token = Token.USR_VAR;
+                    token = Token.VARIANT;
                     return;
                 case '/':
                     scanComment();

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -179,13 +179,10 @@ public class SQLExprParser extends SQLParser {
                 sqlExpr = new SQLNCharExpr(lexer.stringVal());
                 lexer.nextToken();
                 break;
-            case USR_VAR:
+            case VARIANT:
                 sqlExpr = new SQLVariantRefExpr(lexer.stringVal());
                 lexer.nextToken();
                 break;
-            case SYS_VAR:
-                // QS_TODO add support for system var
-                break;
             case CASE:
                 SQLCaseExpr caseExpr = new SQLCaseExpr();
                 lexer.nextToken();

src/main/java/com/alibaba/druid/sql/parser/Token.java

@@ -99,16 +99,13 @@ public enum Token {
     EOF, ERROR,
     IDENTIFIER,
     HINT,
-    // QS_TODO add support in Lexer
-    SYS_VAR, USR_VAR,
+    VARIANT,
     LITERAL_INT,
     LITERAL_FLOAT,
     LITERAL_HEX,
-    // QS_TODO add syntax support
-    LITERAL_BIT,
     LITERAL_CHARS,
     LITERAL_NCHARS,
-    // QS_TODO remove alias token
+    
     LITERAL_ALIAS,
     LINE_COMMENT,
     MULTI_LINE_COMMENT,