net.hydromatic.optiq.impl.spark.JdbcToSparkConverterRule Maven / Gradle / Ivy

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/*
// 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 net.hydromatic.optiq.impl.spark;

import net.hydromatic.optiq.impl.jdbc.JdbcConvention;

import org.eigenbase.rel.RelNode;
import org.eigenbase.rel.convert.ConverterRule;
import org.eigenbase.relopt.RelTraitSet;

/**
 * Rule to convert a relational expression from
 * {@link net.hydromatic.optiq.impl.jdbc.JdbcConvention} to
 * {@link net.hydromatic.optiq.impl.spark.SparkRel#CONVENTION Spark convention}.
 */
public class JdbcToSparkConverterRule extends ConverterRule {
  JdbcToSparkConverterRule(JdbcConvention out) {
    super(
        RelNode.class,
        out, SparkRel.CONVENTION,
        "JdbcToSparkConverterRule");
  }

  @Override
  public RelNode convert(RelNode rel) {
    RelTraitSet newTraitSet = rel.getTraitSet().replace(getOutTrait());
    return new JdbcToSparkConverter(rel.getCluster(), newTraitSet, rel);
  }
}

// End JdbcToSparkConverterRule.java