bug fixed for sql parser.

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlCreateTableParser.java

@@ -195,7 +195,15 @@ public class MySqlCreateTableParser extends SQLCreateTableParser {
                 if (lexer.token() == Token.EQ) {
                     lexer.nextToken();
                 }
-                stmt.getTableOptions().put("ENGINE", this.exprParser.expr());
+
+                SQLExpr expr = null;
+                if (lexer.token() == Token.MERGE) {
+                    expr = new SQLIdentifierExpr(lexer.stringVal());
+                    lexer.nextToken();
+                } else {
+                    expr = this.exprParser.expr();
+                }
+                stmt.getTableOptions().put("ENGINE", expr);
                 continue;
             }
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java

@@ -2097,7 +2097,7 @@ public class OracleOutputVisitor extends SQLASTOutputVisitor implements OracleAS
 
     @Override
     public boolean visit(OracleCreateTableStatement x) {
-        printCreateTable(x);
+        printCreateTable(x, false);
 
         if (x.getOf() != null) {
             println();

src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java

@@ -2367,12 +2367,12 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
     }
 
     public boolean visit(SQLCreateTableStatement x) {
-        printCreateTable(x);
+        printCreateTable(x, true);
 
         return false;
     }
 
-    protected void printCreateTable(SQLCreateTableStatement x) {
+    protected void printCreateTable(SQLCreateTableStatement x, boolean printSelect) {
         print0(ucase ? "CREATE " : "create ");
 
         final SQLCreateTableStatement.Type tableType = x.getType();
@@ -2394,7 +2394,7 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
         }
 
         SQLSelect select = x.getSelect();
-        if (select != null) {
+        if (printSelect && select != null) {
             println();
             print0(ucase ? "AS" : "as");