contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcDrelConverterRule.java

/*
 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.drill.exec.store.jdbc;

import java.util.function.Predicate;

import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.convert.ConverterRule;
import org.apache.drill.exec.planner.logical.DrillRel;
import org.apache.drill.exec.planner.logical.DrillRelFactories;

class JdbcDrelConverterRule extends ConverterRule {

  JdbcDrelConverterRule(DrillJdbcConvention in) {
    super(RelNode.class, (Predicate<RelNode>) input -> true, in, DrillRel.DRILL_LOGICAL,
        DrillRelFactories.LOGICAL_BUILDER, "JDBC_DREL_Converter" + in.getName());
  }

  @Override
  public RelNode convert(RelNode in) {
    return new JdbcDrel(in.getCluster(), in.getTraitSet().replace(DrillRel.DRILL_LOGICAL),
        convert(in, in.getTraitSet().replace(this.getInTrait()).simplify()));
  }
}