| /* |
| * 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 org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.pig.PigException; |
| 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.impl.plan.NodeIdGenerator; |
| import org.apache.pig.impl.plan.OperatorKey; |
| import org.apache.pig.impl.plan.VisitorException; |
| |
| public class LessThanExpr extends BinaryComparisonOperator { |
| |
| /** |
| * |
| */ |
| private static final long serialVersionUID = 1L; |
| transient private final Log log = LogFactory.getLog(getClass()); |
| |
| public LessThanExpr(OperatorKey k) { |
| this(k, -1); |
| } |
| |
| public LessThanExpr(OperatorKey k, int rp) { |
| super(k, rp); |
| resultType = DataType.BOOLEAN; |
| } |
| |
| @Override |
| public String name() { |
| return "Less Than" + "[" + DataType.findTypeName(resultType) + "]" +" - " + mKey.toString(); |
| } |
| |
| @Override |
| public void visit(PhyPlanVisitor v) throws VisitorException { |
| v.visitLessThan(this); |
| } |
| |
| @Override |
| public Result getNextBoolean() throws ExecException { |
| Result left, right; |
| |
| switch (operandType) { |
| case DataType.BYTEARRAY: |
| case DataType.DOUBLE: |
| case DataType.FLOAT: |
| case DataType.INTEGER: |
| case DataType.BIGINTEGER: |
| case DataType.BIGDECIMAL: |
| case DataType.LONG: |
| case DataType.DATETIME: |
| case DataType.CHARARRAY: { |
| Result r = accumChild(null, operandType); |
| if (r != null) { |
| return r; |
| } |
| left = lhs.getNext(operandType); |
| right = rhs.getNext(operandType); |
| return doComparison(left, right); |
| } |
| |
| default: { |
| int errCode = 2067; |
| String msg = this.getClass().getSimpleName() + " does not know how to " + |
| "handle type: " + DataType.findTypeName(operandType); |
| throw new ExecException(msg, errCode, PigException.BUG); |
| } |
| |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| private Result doComparison(Result left, Result right) { |
| if (left.returnStatus != POStatus.STATUS_OK) { |
| return left; |
| } |
| if (right.returnStatus != POStatus.STATUS_OK) { |
| return right; |
| } |
| // if either operand is null, the result should be |
| // null |
| if(left.result == null || right.result == null) { |
| left.result = null; |
| left.returnStatus = POStatus.STATUS_OK; |
| return left; |
| } |
| assert(left.result instanceof Comparable); |
| assert(right.result instanceof Comparable); |
| if (((Comparable)left.result).compareTo(right.result) < 0) { |
| left.result = Boolean.TRUE; |
| } else { |
| left.result = Boolean.FALSE; |
| } |
| illustratorMarkup(null, left.result, (Boolean) left.result ? 0 : 1); |
| return left; |
| } |
| |
| @Override |
| public LessThanExpr clone() throws CloneNotSupportedException { |
| LessThanExpr clone = new LessThanExpr(new OperatorKey(mKey.scope, |
| NodeIdGenerator.getGenerator().getNextNodeId(mKey.scope))); |
| clone.cloneHelper(this); |
| return clone; |
| } |
| } |