sql parser refactor

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

@@ -185,6 +185,10 @@ public class Lexer {
     public final Token token() {
         return token;
     }
+    
+    public String info() {
+        return this.token + " " + this.stringVal();
+    }
 
     public final void nextToken() {
         sp = 0;

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

@@ -167,9 +167,6 @@ public enum Token {
     TOP("TOP"),
     
     // hive
-    PARTITIONED("PARTITIONED"),
-    SHOW("SHOW"),
-    TABLES("TABLES"),
 
     EOF, 
     ERROR,