diff --git a/src/main/java/com/alibaba/druid/sql/dialect/teradata/parser/TeradataSelectParser.java b/src/main/java/com/alibaba/druid/sql/dialect/teradata/parser/TeradataSelectParser.java
index e5c166e2c5..3aa48c9867 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/teradata/parser/TeradataSelectParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/teradata/parser/TeradataSelectParser.java
@@ -1,15 +1,24 @@
+/*
+ * 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.sql.dialect.teradata.parser;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLSetQuantifier;
-import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
-import com.alibaba.druid.sql.ast.expr.SQLDefaultExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
-import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
-import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
-import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.teradata.ast.stmt.TeradataSelectQueryBlock;
 import com.alibaba.druid.sql.parser.ParserException;
 import com.alibaba.druid.sql.parser.SQLExprParser;
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataEvalVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataEvalVisitor.java
index 14e482d1d8..9bab665a39 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataEvalVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataEvalVisitor.java
@@ -1,3 +1,18 @@
+/*
+ * 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.sql.dialect.teradata.visitor;
 
 import java.util.ArrayList;
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataSchemaStatVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataSchemaStatVisitor.java
index 706eb38799..57abb7057d 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataSchemaStatVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/teradata/visitor/TeradataSchemaStatVisitor.java
@@ -20,17 +20,12 @@ import java.util.Map;
 
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObject;
-import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
-import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
-import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
-import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
 import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
 import com.alibaba.druid.sql.dialect.teradata.ast.expr.TeradataAnalytic;
 import com.alibaba.druid.sql.dialect.teradata.ast.expr.TeradataAnalyticWindowing;
 import com.alibaba.druid.sql.dialect.teradata.ast.expr.TeradataIntervalExpr;
 import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
-import com.alibaba.druid.stat.TableStat.Column;
 import com.alibaba.druid.util.JdbcUtils;
 
 public class TeradataSchemaStatVisitor extends SchemaStatVisitor implements TeradataASTVisitor {