RSTPlan.java example

Explorer
squall-master
/*
 * Copyright (c) 2011-2015 EPFL DATA Laboratory
 * Copyright (c) 2014-2015 The Squall Collaboration (see NOTICE)
 *
 * All rights reserved.
 *
 * Licensed 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 ch.epfl.data.squall.examples.imperative.shj;

import java.util.Arrays;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

import ch.epfl.data.squall.components.DataSourceComponent;
import ch.epfl.data.squall.components.EquiJoinComponent;
import ch.epfl.data.squall.expressions.ColumnReference;
import ch.epfl.data.squall.expressions.Multiplication;
import ch.epfl.data.squall.expressions.ValueExpression;
import ch.epfl.data.squall.expressions.ValueSpecification;
import ch.epfl.data.squall.operators.AggregateSumOperator;
import ch.epfl.data.squall.operators.SelectOperator;
import ch.epfl.data.squall.predicates.ComparisonPredicate;
import ch.epfl.data.squall.query_plans.QueryBuilder;
import ch.epfl.data.squall.query_plans.QueryPlan;
import ch.epfl.data.squall.types.DoubleType;
import ch.epfl.data.squall.types.IntegerType;
import ch.epfl.data.squall.types.NumericType;

public class RSTPlan extends QueryPlan {
    private static Logger LOG = Logger.getLogger(RSTPlan.class);

    private static final NumericType<Double> _dc = new DoubleType();
    private static final NumericType<Integer> _ic = new IntegerType();

    private final QueryBuilder _queryBuilder = new QueryBuilder();

    public RSTPlan(String dataPath, String extension, Map conf) {
	// -------------------------------------------------------------------------------------
	// start of query plan filling
	final List<Integer> hashR = Arrays.asList(1);

	final DataSourceComponent relationR = new DataSourceComponent("R",
		dataPath + "r" + extension).setOutputPartKey(hashR);
	_queryBuilder.add(relationR);

	// -------------------------------------------------------------------------------------
	final List<Integer> hashS = Arrays.asList(0);

	final DataSourceComponent relationS = new DataSourceComponent("S",
		dataPath + "s" + extension).setOutputPartKey(hashS);
	_queryBuilder.add(relationS);

	// -------------------------------------------------------------------------------------
	final List<Integer> hashIndexes = Arrays.asList(2);

	final EquiJoinComponent R_Sjoin = new EquiJoinComponent(relationR,
		relationS).setOutputPartKey(hashIndexes);
	_queryBuilder.add(R_Sjoin);

	// -------------------------------------------------------------------------------------
	final List<Integer> hashT = Arrays.asList(0);

	final DataSourceComponent relationT = new DataSourceComponent("T",
		dataPath + "t" + extension).setOutputPartKey(hashT);
	_queryBuilder.add(relationT);

	// -------------------------------------------------------------------------------------
	final ValueExpression<Double> aggVe = new Multiplication(
		new ColumnReference(_dc, 0), new ColumnReference(_dc, 3));

	final AggregateSumOperator sp = new AggregateSumOperator(aggVe, conf);

	EquiJoinComponent rstJoin = new EquiJoinComponent(R_Sjoin, relationT)
		.add(new SelectOperator(new ComparisonPredicate(
			new ColumnReference(_ic, 1), new ValueSpecification(
				_ic, 10)))).add(sp);
	_queryBuilder.add(rstJoin);
    }

    @Override
    public QueryBuilder getQueryPlan() {
	return _queryBuilder;
    }
}