improved sql parser, bug fixed for parent is null

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlASTVisitorAdapterTest.java

@@ -19,7 +19,6 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableDiscardT
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableImportTablespace;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableModifyColumn;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableOption;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlBinlogStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCreateTableStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCreateTableStatement.TableSpaceOption;
@@ -160,7 +159,6 @@ public class MySqlASTVisitorAdapterTest extends TestCase {
         new MySqlShowSlaveStatusStatement().accept(adapter);
         new MySqlShowTableStatusStatement().accept(adapter);
         new MySqlShowTriggersStatement().accept(adapter);
-        new MySqlAlterTableStatement().accept(adapter);
         new MySqlRenameTableStatement().accept(adapter);
         new MySqlUnionQuery().accept(adapter);
         new MySqlUseIndexHint().accept(adapter);

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterDbTest0.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 1999-2101 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.mysql;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.parser.Token;
+
+public class MySqlAlterDbTest0 extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME;";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME", output);
+    }
+
+}

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest21.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 1999-2101 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.mysql;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.parser.Token;
+
+public class MySqlAlterTableTest21 extends TestCase {
+
+    public void test_alter_add_key() throws Exception {
+        String sql = "ALTER TABLE tbl_name CONVERT TO CHARACTER SET charset_name";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE tbl_name"
+                + "\n\tCONVERT TO CHARACTER SET charset_name", output);
+    }
+}

src/test/java/com/alibaba/druid/bvt/sql/oracle/visitor/OracleASTVisitorAdapterTest.java

@@ -54,7 +54,6 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableDropPartiti
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableModify;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableMoveTablespace;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableSplitPartition;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableTruncatePartition;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTablespaceAddDataFile;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTablespaceStatement;
@@ -185,7 +184,6 @@ public class OracleASTVisitorAdapterTest extends TestCase {
         new OracleAlterProcedureStatement().accept(adapter);
         new OracleAlterTableDropPartition().accept(adapter);
         new OracleAlterTableTruncatePartition().accept(adapter);
-        new OracleAlterTableStatement().accept(adapter);
         new OracleAlterTableSplitPartition.TableSpaceItem().accept(adapter);
         new OracleAlterTableSplitPartition.UpdateIndexesClause().accept(adapter);
         new OracleAlterTableSplitPartition.NestedTablePartitionSpec().accept(adapter);