improve ddl parser

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlAlterTableChangeColumn.java

@@ -40,7 +40,7 @@ public class MySqlAlterTableChangeColumn extends MySqlObjectImpl implements SQLA
         if (visitor.visit(this)) {
             acceptChild(visitor, columnName);
             acceptChild(visitor, newColumnDefinition);
-            
+
             acceptChild(visitor, firstColumn);
             acceptChild(visitor, afterColumn);
         }

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

@@ -16,6 +16,7 @@
 package com.alibaba.druid.sql.dialect.mysql.parser;
 
 import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.statement.SQLCheck;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLSelect;
@@ -135,6 +136,13 @@ public class MySqlCreateTableParser extends SQLCreateTableParser {
                     accept(Token.RPAREN);
 
                     stmt.getTableElementList().add(fk);
+                } else if (lexer.token() == Token.CHECK) {
+                    lexer.nextToken();
+                    SQLCheck check = new SQLCheck();
+                    accept(Token.LPAREN);
+                    check.setExpr(this.exprParser.expr());
+                    accept(Token.RPAREN);
+                    stmt.getTableElementList().add(check);
                 }
 
                 if (!(lexer.token() == (Token.COMMA))) {

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

@@ -307,6 +307,10 @@ public class MySqlStatementParser extends SQLStatementParser {
         if (identifierEquals(USER)) {
             return parseCreateUser();
         }
+        
+        if (lexer.token() == Token.VIEW) {
+            return parseCreateView();
+        }
 
         throw new ParserException("TODO " + lexer.token());
     }

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java

@@ -21,6 +21,8 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableItem;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
+import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLDropTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
@@ -1146,6 +1148,11 @@ public class MySqlSchemaStatVisitor extends SchemaStatVisitor implements MySqlAS
 
     @Override
     public boolean visit(MySqlAlterTableChangeColumn x) {
+        SQLAlterTableStatement stmt = (SQLAlterTableStatement) x.getParent();
+        String table = stmt.getName().toString();
+
+        String columnName = x.getColumnName().toString();
+        addColumn(table, columnName);
         return false;
     }