/* This file is part of VoltDB.
* Copyright (C) 2008-2017 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltdb.plannodes;
import org.json_voltpatches.JSONException;
import org.json_voltpatches.JSONObject;
import org.json_voltpatches.JSONStringer;
import org.voltdb.catalog.Database;
import org.voltdb.types.PlanNodeType;
public class DeletePlanNode extends AbstractOperationPlanNode {
public enum Members {
TRUNCATE;
}
/** true if all tuples are deleted. */
boolean m_truncate = false;
public DeletePlanNode() {
super();
}
@Override
public PlanNodeType getPlanNodeType() {
return PlanNodeType.DELETE;
};
public boolean isTruncate() {
return m_truncate;
}
public void setTruncate(boolean truncate) {
m_truncate = truncate;
}
@Override
public void toJSONString(JSONStringer stringer) throws JSONException {
super.toJSONString(stringer);
stringer.keySymbolValuePair(Members.TRUNCATE.name(), m_truncate);
}
@Override
public void loadFromJSONObject( JSONObject jobj, Database db ) throws JSONException {
super.loadFromJSONObject(jobj, db);
m_truncate = jobj.getBoolean( Members.TRUNCATE.name() );
}
@Override
protected String explainPlanForNode(String indent) {
if (m_truncate) {
return "TRUNCATE TABLE " + m_targetTableName;
}
return "DELETE " + m_targetTableName;
}
@Override
public boolean isOrderDeterministic() {
/* This API seems like "not the right question" here. DELETE nodes
* just return the one row, so order determinism is not really
* applicable. Note however that INSERT nodes will return the
* order determinism of the SELECT statement in the case of INSERT INTO
* ... SELECT. So just returning true here is a little inconsistent.
*
* Seems like we need a better way to model determinism for DML. See
* ENG-7445.
*/
return true;
}
}