| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.util.List; |
| |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.pig.ComparisonFunc; |
| import org.apache.pig.FuncSpec; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.PigContext; |
| import org.apache.pig.impl.plan.NodeIdGenerator; |
| import org.apache.pig.impl.plan.OperatorKey; |
| import org.apache.pig.impl.plan.VisitorException; |
| |
| //We intentionally skip type checking in backend for performance reasons |
| @SuppressWarnings("unchecked") |
| public class POUserComparisonFunc extends ExpressionOperator { |
| private final static Log log = LogFactory.getLog(POUserComparisonFunc.class); |
| |
| /** |
| * |
| */ |
| private static final long serialVersionUID = 1L; |
| FuncSpec funcSpec; |
| Tuple t1, t2; |
| transient ComparisonFunc func; |
| |
| public POUserComparisonFunc(OperatorKey k, int rp, List inp, FuncSpec funcSpec, ComparisonFunc func) { |
| super(k, rp); |
| super.setInputs(inp); |
| this.funcSpec = funcSpec; |
| this.func = func; |
| if(func==null) |
| instantiateFunc(); |
| } |
| |
| public POUserComparisonFunc(OperatorKey k, int rp, List inp, FuncSpec funcSpec) { |
| this(k, rp, inp, funcSpec, null); |
| } |
| |
| private void instantiateFunc() { |
| this.func = (ComparisonFunc) PigContext.instantiateFuncFromSpec(this.funcSpec); |
| this.func.setReporter(getReporter()); |
| } |
| |
| public ComparisonFunc getComparator() { |
| return func; |
| } |
| |
| @Override |
| public Result getNextInteger() throws ExecException { |
| Result result = new Result(); |
| |
| result.result = func.compare(t1, t2); |
| result.returnStatus = (t1 != null && t2 != null) ? POStatus.STATUS_OK |
| : POStatus.STATUS_ERR; |
| // the two attached tuples are used up now. So we set the |
| // inputAttached flag to false |
| inputAttached = false; |
| if (result.returnStatus == POStatus.STATUS_OK) |
| illustratorMarkup(null, result.result, |
| (Integer) result.result == 0 ? 0 : (Integer) result.result > 0 ? 1 : 2); |
| return result; |
| |
| } |
| |
| private Result getNext() { |
| Result res = null; |
| log.error("getNext being called with non-integer"); |
| return res; |
| } |
| |
| @Override |
| public Result getNextBoolean() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextDataBag() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextDataByteArray() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextDouble() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextFloat() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextLong() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextDateTime() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextMap() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextString() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextTuple() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextBigInteger() throws ExecException { |
| return getNext(); |
| } |
| |
| @Override |
| public Result getNextBigDecimal() throws ExecException { |
| return getNext(); |
| } |
| |
| public void attachInput(Tuple t1, Tuple t2) { |
| this.t1 = t1; |
| this.t2 = t2; |
| inputAttached = true; |
| |
| } |
| |
| private void readObject(ObjectInputStream is) throws IOException, ClassNotFoundException{ |
| is.defaultReadObject(); |
| instantiateFunc(); |
| } |
| |
| @Override |
| public void visit(PhyPlanVisitor v) throws VisitorException { |
| v.visitComparisonFunc(this); |
| } |
| |
| @Override |
| public String name() { |
| return "POUserComparisonFunc" + "(" + func.getClass().getName() + ")" + "[" + DataType.findTypeName(resultType) + "]" + " - " + mKey.toString(); |
| } |
| |
| @Override |
| public boolean supportsMultipleInputs() { |
| return false; |
| } |
| |
| public FuncSpec getFuncSpec() { |
| return funcSpec; |
| } |
| |
| @Override |
| public POUserComparisonFunc clone() throws CloneNotSupportedException { |
| FuncSpec cloneFs = null; |
| if (funcSpec != null) { |
| cloneFs = funcSpec.clone(); |
| } |
| POUserComparisonFunc clone = |
| new POUserComparisonFunc(new OperatorKey(mKey.scope, |
| NodeIdGenerator.getGenerator().getNextNodeId(mKey.scope)), |
| requestedParallelism, null, cloneFs); |
| clone.cloneHelper(this); |
| return clone; |
| } |
| |
| /** |
| * Get child expressions of this expression |
| */ |
| @Override |
| public List<ExpressionOperator> getChildExpressions() { |
| return null; |
| } |
| |
| @Override |
| public Tuple illustratorMarkup(Object in, Object out, int eqClassIndex) { |
| if(illustrator != null) { |
| illustrator.getInputs().add(t1); |
| illustrator.getEquivalenceClasses().get(eqClassIndex).add(t1); |
| illustrator.getInputs().add(t2); |
| illustrator.getEquivalenceClasses().get(eqClassIndex).add(t2); |
| } |
| return null; |
| } |
| } |