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.BeamJoinRel;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamLogicalConvention;
  import org.apache.beam.sdk.extensions.sql.impl.rel.BeamSideInputLookupJoinRel;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.plan.Convention;
  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.rel.RelNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.convert.ConverterRule;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.core.Join;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rel.logical.LogicalJoin;
  
  /**
   * Rule to convert {@code LogicalJoin} node to {@code BeamSideInputLookupJoinRel} node.
   *
   * <p>This rule is matched when any of the inputs to {@code LogicalJoin} node are Seekable
   */
  public class BeamSideInputLookupJoinRule extends ConverterRule {
    public static final BeamSideInputLookupJoinRule INSTANCE = new BeamSideInputLookupJoinRule();
  
    public BeamSideInputLookupJoinRule() {
      super(
          LogicalJoin.class,
          Convention.NONE,
          BeamLogicalConvention.INSTANCE,
          "BeamSideInputLookupJoinRule");
    }
  
    // The Rule is Matched when any of the inputs are Seekable
    @Override
    public boolean matches(RelOptRuleCall call) {
      RelNode joinRel = call.rel(0);
      boolean matches = BeamJoinRel.containsSeekableInput(joinRel);
      return (matches);
    }
  
    @Override
    public RelNode convert(RelNode rel) {
      Join join = (Join) rel;
  
      return (new BeamSideInputLookupJoinRel(
          join.getCluster(),
          join.getTraitSet().replace(BeamLogicalConvention.INSTANCE),
          convert(
              join.getLeft(), join.getLeft().getTraitSet().replace(BeamLogicalConvention.INSTANCE)),
          convert(
              join.getRight(), join.getRight().getTraitSet().replace(BeamLogicalConvention.INSTANCE)),
          join.getCondition(),
          join.getVariablesSet(),
          join.getJoinType()));
    }
  }
  