refactor

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

@@ -217,12 +217,9 @@ public class SQLExprParser extends SQLParser {
             case REFERENCE:
             case KEY:
             case DISTINCT:
-            case TIME:
             case ZONE:
-            case LOG:
             case LIMIT:
             case SCHEMA:
-            case AT:
             case COLUMN:
             case IF:
                 sqlExpr = new SQLIdentifierExpr(lexer.stringVal());

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

@@ -96,8 +96,7 @@ public class SQLParser {
         } else if (lexer.token() == Token.LITERAL_CHARS) {
             alias = "'" + lexer.stringVal() + "'";
             lexer.nextToken();
-        } else if (lexer.token() == Token.TIME || lexer.token() == Token.CASE || lexer.token() == Token.AT
-                   || lexer.token() == Token.LOG) {
+        } else if (lexer.token() == Token.CASE) {
             alias = lexer.token.name();
             lexer.nextToken();
         }

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

@@ -145,7 +145,6 @@ public enum Token {
     MODEL("MODEL"),
     MERGE("MERGE"),
     MATCHED("MATCHED"),
-    LOG("LOG"),
     ERRORS("ERRORS"),
     REJECT("REJECT"),
     UNLIMITED("UNLIMITED"),
@@ -156,9 +155,7 @@ public enum Token {
     ADVISE("ADVISE"),
     SESSION("SESSION"),
     PROCEDURE("PROCEDURE"),
-    AT("AT"),
     LOCAL("LOCAL"),
-    TIME("TIME"),
     ZONE("ZONE"),
     SYSDATE("SYSDATE"),
     DECLARE("DECLARE"),