| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.common.utils.Triple; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.typing.NonPropagatingTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor; |
| |
| public class UnionAllOperator extends AbstractLogicalOperator { |
| |
| // (left-var, right-var, out-var) |
| private List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> varMap; |
| |
| public UnionAllOperator(List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> varMap) { |
| this.varMap = varMap; |
| } |
| |
| public List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> getVariableMappings() { |
| return varMap; |
| } |
| |
| @Override |
| public LogicalOperatorTag getOperatorTag() { |
| return LogicalOperatorTag.UNIONALL; |
| } |
| |
| @Override |
| public VariablePropagationPolicy getVariablePropagationPolicy() { |
| return new VariablePropagationPolicy() { |
| |
| @Override |
| public void propagateVariables(IOperatorSchema target, IOperatorSchema... sources) |
| throws AlgebricksException { |
| for (Triple<LogicalVariable, LogicalVariable, LogicalVariable> t : varMap) { |
| target.addVariable(t.third); |
| } |
| } |
| }; |
| |
| } |
| |
| @Override |
| public boolean acceptExpressionTransform(ILogicalExpressionReferenceTransform visitor) throws AlgebricksException { |
| return false; |
| } |
| |
| @Override |
| public <R, T> R accept(ILogicalOperatorVisitor<R, T> visitor, T arg) throws AlgebricksException { |
| return visitor.visitUnionOperator(this, arg); |
| } |
| |
| @Override |
| public void recomputeSchema() { |
| schema = new ArrayList<LogicalVariable>(); |
| for (LogicalVariable v1 : inputs.get(0).getValue().getSchema()) { |
| for (Triple<LogicalVariable, LogicalVariable, LogicalVariable> t : varMap) { |
| if (t.first.equals(v1)) { |
| schema.add(t.third); |
| } else { |
| schema.add(v1); |
| } |
| } |
| } |
| for (LogicalVariable v2 : inputs.get(1).getValue().getSchema()) { |
| for (Triple<LogicalVariable, LogicalVariable, LogicalVariable> t : varMap) { |
| if (t.second.equals(v2)) { |
| schema.add(t.third); |
| } else { |
| schema.add(v2); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public boolean isMap() { |
| return false; |
| } |
| |
| @Override |
| public IVariableTypeEnvironment computeOutputTypeEnvironment(ITypingContext ctx) throws AlgebricksException { |
| IVariableTypeEnvironment env = new NonPropagatingTypeEnvironment(ctx.getExpressionTypeComputer(), |
| ctx.getMetadataProvider()); |
| IVariableTypeEnvironment envLeft = ctx.getOutputTypeEnvironment(inputs.get(0).getValue()); |
| if (envLeft == null) { |
| throw new AlgebricksException("Left input types for union operator are not computed."); |
| } |
| for (Triple<LogicalVariable, LogicalVariable, LogicalVariable> t : varMap) { |
| Object t1 = envLeft.getVarType(t.first); |
| if (t1 == null) { |
| throw new AlgebricksException("Failed typing union operator: no type for variable " + t.first); |
| } |
| env.setVarType(t.third, t1); |
| } |
| return env; |
| } |
| |
| } |