content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.sdk.extensions.sql.impl.rule;
  
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamCalcRel;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.RelOptRule;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.RelOptRuleCall;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.RelOptRuleOperand;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.rules.CalcMergeRule;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.rules.CoreRules;
  
  /**
   * Planner rule to merge a {@link BeamCalcRel} with a {@link BeamCalcRel}. Subset of {@link
   * CalcMergeRule}.
   */
  public class BeamCalcMergeRule extends RelOptRule {
    public static final BeamCalcMergeRule INSTANCE = new BeamCalcMergeRule();
  
    public BeamCalcMergeRule() {
      super(operand(BeamCalcRel.class, operand(BeamCalcRel.class, any()), new RelOptRuleOperand[0]));
    }
  
    @Override
    public void onMatch(RelOptRuleCall call) {
      CoreRules.CALC_MERGE.onMatch(call);
    }
  }
  