GroupReduceNode extends SingleInputNode { @Override protected SemanticProperties getSemanticPropertiesForLocalPropertyFiltering() { SingleInputSemanticProperties origProps = getOperator().getSemanticProperties(); SingleInputSemanticProperties filteredProps = new SingleInputSemanticProperties(); FieldSet readSet = origProps.getReadFields(0); if(readSet != null) { filteredProps.addReadFields(readSet); } if(this.keys != null) { for (int f : this.keys) { FieldSet targets = origProps.getForwardingTargetFields(0, f); for (int t : targets) { filteredProps.addForwardedField(f, t); } } } return filteredProps; } GroupReduceNode(GroupReduceOperatorBase<?, ?, ?> operator); private  GroupReduceNode(GroupReduceNode reducerToCopyForCombiner); @Override GroupReduceOperatorBase<?, ?, ?> getOperator(); boolean isCombineable(); @Override String getOperatorName(); GroupReduceNode getCombinerUtilityNode();  }
@Test public void testGetSemanticProperties() { SingleInputSemanticProperties origProps = new SingleInputSemanticProperties(); origProps.addForwardedField(0, 1); origProps.addForwardedField(2, 2); origProps.addForwardedField(3, 4); origProps.addForwardedField(6, 0); origProps.addReadFields(new FieldSet(0, 2, 4, 7)); GroupReduceOperatorBase<?,?,?> op = mock(GroupReduceOperatorBase.class); when(op.getSemanticProperties()).thenReturn(origProps); when(op.getKeyColumns(0)).thenReturn(new int[]{3,2}); when(op.getParameters()).thenReturn(new Configuration()); GroupReduceNode node = new GroupReduceNode(op); SemanticProperties filteredProps = node.getSemanticPropertiesForLocalPropertyFiltering(); assertTrue(filteredProps.getForwardingTargetFields(0, 0).size() == 0); assertTrue(filteredProps.getForwardingTargetFields(0, 2).size() == 1); assertTrue(filteredProps.getForwardingTargetFields(0, 2).contains(2)); assertTrue(filteredProps.getForwardingTargetFields(0, 3).size() == 1); assertTrue(filteredProps.getForwardingTargetFields(0, 3).contains(4)); assertTrue(filteredProps.getForwardingTargetFields(0, 6).size() == 0); assertTrue(filteredProps.getForwardingSourceField(0, 1) < 0); assertTrue(filteredProps.getForwardingSourceField(0, 2) == 2); assertTrue(filteredProps.getForwardingSourceField(0, 4) == 3); assertTrue(filteredProps.getForwardingSourceField(0, 0) < 0); assertTrue(filteredProps.getReadFields(0).size() == 4); assertTrue(filteredProps.getReadFields(0).contains(0)); assertTrue(filteredProps.getReadFields(0).contains(2)); assertTrue(filteredProps.getReadFields(0).contains(4)); assertTrue(filteredProps.getReadFields(0).contains(7)); }