refactor sql parser group by

src/main/java/com/alibaba/druid/sql/ast/expr/SQLGroupingSetExpr.java

@@ -0,0 +1,76 @@
+/*
+ * 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.ast.expr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLExprImpl;
+import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLGroupingSetExpr extends SQLExprImpl {
+
+    private final List<SQLExpr> parameters = new ArrayList<SQLExpr>();
+
+    public List<SQLExpr> getParameters() {
+        return parameters;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        accept0((OracleASTVisitor) visitor);
+    }
+
+    protected void accept0(OracleASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, parameters);
+        }
+        visitor.endVisit(this);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((parameters == null) ? 0 : parameters.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (!(obj instanceof SQLGroupingSetExpr)) {
+            return false;
+        }
+        SQLGroupingSetExpr other = (SQLGroupingSetExpr) obj;
+        if (parameters == null) {
+            if (other.parameters != null) {
+                return false;
+            }
+        } else if (!parameters.equals(other.parameters)) {
+            return false;
+        }
+        return true;
+    }
+
+}