content: /*
   * Copyright 1999-2017 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.odps.ast;
  
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLName;
  import com.alibaba.druid.sql.dialect.odps.visitor.OdpsASTVisitor;
  
  public abstract class OdpsStatisticClause extends OdpsObjectImpl {
      public abstract static class ColumnStatisticClause extends OdpsStatisticClause {
          protected SQLName column;
  
          public SQLName getColumn() {
              return column;
          }
  
          public void setColumn(SQLName column) {
              if (column != null) {
                  column.setParent(this);
              }
              this.column = column;
          }
  
      }
  
      public static class NullValue extends ColumnStatisticClause {
          @Override
          public void accept0(OdpsASTVisitor visitor) {
              if (visitor.visit(this)) {
                  acceptChild(visitor, column);
              }
              visitor.endVisit(this);
          }
      }
  
      public static class ColumnSum extends ColumnStatisticClause {
          @Override
          public void accept0(OdpsASTVisitor visitor) {
              if (visitor.visit(this)) {
                  acceptChild(visitor, column);
              }
              visitor.endVisit(this);
          }
      }
  
      public static class ColumnMin extends ColumnStatisticClause {
          @Override
          public void accept0(OdpsASTVisitor visitor) {
              if (visitor.visit(this)) {
                  acceptChild(visitor, column);
              }
              visitor.endVisit(this);
          }
      }
  
      public static class DistinctValue extends ColumnStatisticClause {
          @Override
          public void accept0(OdpsASTVisitor visitor) {
              if (visitor.visit(this)) {
                  acceptChild(visitor, column);
              }
              visitor.endVisit(this);
          }
      }
  
      public static class ColumnMax extends ColumnStatisticClause {
          @Override
          public void accept0(OdpsASTVisitor visitor) {
              if (visitor.visit(this)) {
                  acceptChild(visitor, column);
              }
              visitor.endVisit(this);
          }
      }
  
      public static class ExpressionCondition extends OdpsStatisticClause {
          private SQLExpr expr;
  
          public SQLExpr getExpr() {
              return expr;
          }
  
          public void setExpr(SQLExpr expr) {
              if (expr != null) {
                  expr.setParent(this);
              }
              this.expr = expr;
          }
  
          @Override
          public void accept0(OdpsASTVisitor visitor) {
              if (visitor.visit(this)) {
                  acceptChild(visitor, expr);
              }
              visitor.endVisit(this);
          }
      }
  
      public static class TableCount extends OdpsStatisticClause {
          @Override
          public void accept0(OdpsASTVisitor visitor) {
              visitor.visit(this);
              visitor.endVisit(this);
          }
  
      }
  }
  