sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rule/BeamIntersectRule.java

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 * 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
 *
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 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.beam.sdk.extensions.sql.impl.rule;

import java.util.List;
import org.apache.beam.sdk.extensions.sql.impl.rel.BeamIntersectRel;
import org.apache.beam.sdk.extensions.sql.impl.rel.BeamLogicalConvention;
import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.Convention;
import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelNode;
import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.convert.ConverterRule;
import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.core.Intersect;
import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.logical.LogicalIntersect;

/** {@code ConverterRule} to replace {@code Intersect} with {@code BeamIntersectRel}. */
public class BeamIntersectRule extends ConverterRule {
  public static final BeamIntersectRule INSTANCE = new BeamIntersectRule();

  private BeamIntersectRule() {
    super(
        LogicalIntersect.class,
        Convention.NONE,
        BeamLogicalConvention.INSTANCE,
        "BeamIntersectRule");
  }

  @Override
  public RelNode convert(RelNode rel) {
    Intersect intersect = (Intersect) rel;
    final List<RelNode> inputs = intersect.getInputs();
    return new BeamIntersectRel(
        intersect.getCluster(),
        intersect.getTraitSet().replace(BeamLogicalConvention.INSTANCE),
        convertList(inputs, BeamLogicalConvention.INSTANCE),
        intersect.all);
  }
}