improve wall filter

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

@@ -114,6 +114,8 @@ public class Keywords {
         map.put("OVER", Token.OVER);
         map.put("TO", Token.TO);
         map.put("USE", Token.USE);
+        
+        map.put("REPLACE", Token.REPLACE);
 
         DEFAULT_KEYWORDS = new Keywords(map);
     }

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

@@ -195,7 +195,7 @@ public class SQLStatementParser extends SQLParser {
                 continue;
             }
 
-            if (identifierEquals("SHOW")) {
+            if (lexer.token() == Token.SHOW) {
                 SQLStatement stmt = parseShow();
 
                 statementList.add(stmt);
@@ -489,7 +489,7 @@ public class SQLStatementParser extends SQLParser {
             return parseCreateSequence(false);
         } else if (token == Token.OR) {
             lexer.nextToken();
-            acceptIdentifier("REPLACE");
+            accept(Token.REPLACE);
             if (lexer.token() == Token.PROCEDURE) {
                 lexer.reset(markBp, markChar, Token.CREATE);
                 return parseCreateProcedure();
@@ -651,7 +651,7 @@ public class SQLStatementParser extends SQLParser {
         
         if (lexer.token() == Token.OR) {
             lexer.nextToken();
-            acceptIdentifier("REPLACE");
+            accept(Token.REPLACE);
             createView.setOrReplace(true);
         }
 

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

@@ -107,6 +107,8 @@ public enum Token {
     PASSWORD("PASSWORD"),
     DUAL("DUAL"),
     BINARY("BINARY"),
+    SHOW("SHOW"),
+    REPLACE("REPLACE"),
     
     //postgresql
     WINDOW("WINDOW"),