/* This file is part of VoltDB.
* Copyright (C) 2008-2010 VoltDB L.L.C.
*
* VoltDB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* VoltDB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltdb.plannodes;
import org.voltdb.catalog.Cluster;
import org.voltdb.catalog.Database;
import org.voltdb.catalog.Table;
import org.voltdb.compiler.DatabaseEstimates;
import org.voltdb.compiler.ScalarValueHints;
import org.voltdb.planner.PlanStatistics;
import org.voltdb.planner.PlannerContext;
import org.voltdb.planner.StatsField;
import org.voltdb.types.PlanNodeType;
/**
*
*/
public class SeqScanPlanNode extends AbstractScanPlanNode {
/**
* @param id
*/
public SeqScanPlanNode(PlannerContext context, Integer id) {
super(context, id);
}
@Override
public PlanNodeType getPlanNodeType() {
return PlanNodeType.SEQSCAN;
}
@Override
public boolean computeEstimatesRecursively(PlanStatistics stats, Cluster cluster, Database db, DatabaseEstimates estimates, ScalarValueHints[] paramHints) {
Table target = db.getTables().getIgnoreCase(m_targetTableName);
assert(target != null);
DatabaseEstimates.TableEstimates tableEstimates = estimates.getEstimatesForTable(target.getTypeName());
stats.incrementStatistic(0, StatsField.TUPLES_READ, tableEstimates.maxTuples);
m_estimatedOutputTupleCount = tableEstimates.maxTuples;
return true;
}
}