| /* |
| * 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.newplan.logical.expression; |
| |
| import java.util.List; |
| |
| import org.apache.pig.FuncSpec; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.impl.builtin.ReadScalars; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.Operator; |
| import org.apache.pig.newplan.OperatorPlan; |
| import org.apache.pig.newplan.PlanVisitor; |
| import org.apache.pig.newplan.logical.relational.LogicalRelationalOperator; |
| import org.apache.pig.newplan.logical.relational.LogicalSchema; |
| import org.apache.pig.newplan.logical.relational.LogicalSchema.LogicalFieldSchema; |
| import org.apache.pig.parser.SourceLocation; |
| |
| public class ScalarExpression extends UserFuncExpression { |
| private Operator implicitReferencedOperator = null; |
| private Operator attachedLogicalOperator = null; // The logical Operator where this udf is used. |
| |
| private static FuncSpec funcSpec = new FuncSpec( ReadScalars.class.getName() ); |
| |
| public ScalarExpression(OperatorPlan plan) { |
| super( plan, funcSpec ); |
| } |
| |
| public ScalarExpression(OperatorPlan plan, Operator implicitReferencedOperator, |
| Operator attachedLogicalOperator) { |
| this( plan ); |
| this.implicitReferencedOperator = implicitReferencedOperator; |
| this.attachedLogicalOperator = attachedLogicalOperator; |
| } |
| |
| @Override |
| public LogicalSchema.LogicalFieldSchema getFieldSchema() throws FrontendException { |
| if (fieldSchema!=null) |
| return fieldSchema; |
| |
| // TODO: apparently there is a problem with some test cases where implicitReferencedOperator can be null, |
| // even for a scalar UDF. Need more investigation. For now, simulate the old code to make these |
| // test case pass. |
| if( implicitReferencedOperator != null ) { |
| List<Operator> args = plan.getSuccessors(this); |
| if(args != null && args.size() > 0 ){ |
| int pos = (Integer)((ConstantExpression)args.get(0)).getValue(); |
| LogicalRelationalOperator inp = (LogicalRelationalOperator)implicitReferencedOperator; |
| |
| if( inp.getSchema() != null){ |
| LogicalFieldSchema inpFs = inp.getSchema().getField(pos); |
| fieldSchema = new LogicalFieldSchema(inpFs); |
| // fieldSchema.alias = "ReadScalars_" + fieldSchema.alias; |
| }else{ |
| fieldSchema = new LogicalFieldSchema(null, null, DataType.BYTEARRAY); |
| } |
| return fieldSchema; |
| }else{ |
| //predecessors haven't been setup, return null |
| return null; |
| } |
| } else { |
| return super.getFieldSchema(); |
| } |
| } |
| |
| @Override |
| public LogicalExpression deepCopy(LogicalExpressionPlan lgExpPlan) throws FrontendException { |
| ScalarExpression copy = null; |
| copy = new ScalarExpression( lgExpPlan, implicitReferencedOperator, |
| attachedLogicalOperator ); |
| |
| // Deep copy the input expressions. |
| List<Operator> inputs = plan.getSuccessors( this ); |
| if( inputs != null ) { |
| for( Operator op : inputs ) { |
| LogicalExpression input = (LogicalExpression)op; |
| LogicalExpression inputCopy = input.deepCopy( lgExpPlan ); |
| lgExpPlan.add( inputCopy ); |
| lgExpPlan.connect( copy, inputCopy ); |
| } |
| } |
| |
| copy.setLocation( new SourceLocation( location ) ); |
| return copy; |
| } |
| |
| @Override |
| public void accept(PlanVisitor v) throws FrontendException { |
| if( !( v instanceof LogicalExpressionVisitor ) ) { |
| throw new FrontendException( "Expected LogicalExpressionVisitor", 2222 ); |
| } |
| ((LogicalExpressionVisitor)v).visit( this ); |
| } |
| |
| public Operator getImplicitReferencedOperator() { |
| return implicitReferencedOperator; |
| } |
| |
| public void setImplicitReferencedOperator(Operator implicitReferencedOperator) { |
| this.implicitReferencedOperator = implicitReferencedOperator; |
| } |
| |
| public void setAttachedLogicalOperator(Operator attachedLogicalOperator) { |
| this.attachedLogicalOperator = attachedLogicalOperator; |
| } |
| |
| public Operator getAttachedLogicalOperator() { |
| return attachedLogicalOperator; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder msg = new StringBuilder(); |
| msg.append( "(Name: ScalarExpression)" + " Type: "); |
| if (fieldSchema!=null) |
| msg.append(DataType.findTypeName(fieldSchema.type)); |
| else |
| msg.append("null"); |
| msg.append(" Uid: "); |
| if (fieldSchema!=null) |
| msg.append(fieldSchema.uid); |
| else |
| msg.append("null"); |
| msg.append(")"); |
| |
| return msg.toString(); |
| } |
| |
| } |