package com.tesora.dve.sql.transform.strategy.aggregation;
/*
* #%L
* Tesora Inc.
* Database Virtualization Engine
* %%
* Copyright (C) 2011 - 2014 Tesora Inc.
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 this program. If not, see <http://www.gnu.org/licenses/>.
* #L%
*/
import java.util.List;
import com.tesora.dve.sql.node.expression.ExpressionNode;
import com.tesora.dve.sql.node.test.EngineConstant;
import com.tesora.dve.sql.schema.SchemaContext;
import com.tesora.dve.sql.transform.strategy.*;
public class CompoundExpressionProjectionMutator extends ProjectionMutator {
public CompoundExpressionProjectionMutator(SchemaContext sc) {
super(sc);
}
@Override
public List<ExpressionNode> adapt(MutatorState ms, List<ExpressionNode> proj) {
ProjectionCharacterization pc = ProjectionCharacterization.getProjectionCharacterization(ms.getStatement());
List<ColumnCharacterization> ccs = pc.getColumns();
for(int i = 0; i < ccs.size(); i++) {
ColumnCharacterization cc = ccs.get(i);
ColumnMutator cm = null;
if (!cc.hasAnyAggFuns() || (!cc.hasAnyNonAggFunColumns() && EngineConstant.AGGFUN.has(cc.getEntry().getTarget())))
cm = new PassThroughMutator();
else
cm = new CompoundExpressionColumnMutator();
cm.setBeforeOffset(i);
columns.add(cm);
}
return applyAdapted(proj,ms);
}
}