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.presto.ast.stmt;
  
  import com.alibaba.druid.sql.ast.statement.SQLAlterFunctionStatement;
  import com.alibaba.druid.sql.dialect.presto.visitor.PrestoASTVisitor;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  public class PrestoAlterFunctionStatement extends SQLAlterFunctionStatement implements PrestoSQLStatement {
      public PrestoAlterFunctionStatement() {
      }
  
      private boolean returnsNullOnNullInput;
      private boolean calledOnNullInput;
  
      public boolean isReturnsNullOnNullInput() {
          return returnsNullOnNullInput;
      }
  
      public void setReturnsNullOnNullInput(boolean returnsNullOnNullInput) {
          this.returnsNullOnNullInput = returnsNullOnNullInput;
      }
  
      public boolean isCalledOnNullInput() {
          return calledOnNullInput;
      }
  
      public void setCalledOnNullInput(boolean calledOnNullInput) {
          this.calledOnNullInput = calledOnNullInput;
      }
  
      @Override
      public void accept0(SQLASTVisitor v) {
          if (v instanceof PrestoASTVisitor) {
              this.accept0((PrestoASTVisitor) v);
          } else {
              super.accept0(v);
          }
      }
  
      @Override
      public void accept0(PrestoASTVisitor visitor) {
          visitor.visit(this);
      }
  }
  