Program: 124958
Project: 124958
Buggy source:
@Override protected void addButtonListener(){
  IService expressionBuilderDialogService=GlobalServiceRegister.getDefault().getService(IExpressionBuilderDialogService.class);
  final IExpressionBuilderDialogController dialog=((IExpressionBuilderDialogService)expressionBuilderDialogService).getExpressionBuilderInstance(parent,null,null,null);
  button.addMouseListener(new MouseListener(){
    @Override public void mousePressed(    MouseEvent me){
      List<Variable> vars=new ArrayList<Variable>();
      if (tableManager.getModel() != null && (tableManager.getModel() instanceof InputTable || tableManager.getModel() instanceof OutputTable)) {
        if (tableManager.getModel().eContainer() != null && tableManager.getModel().eContainer() instanceof PigMapData) {
          PigMapData pigMapData=(PigMapData)tableManager.getModel().eContainer();
          List<InputTable> inputTables=pigMapData.getInputTables();
          for (          InputTable table : inputTables) {
            List<TableNode> nodes=table.getNodes();
            for (            TableNode node : nodes) {
              Variable variable=new Variable();
              variable.setName(table.getName());
              variable.setValue(node.getName());
              vars.add(variable);
            }
          }
          if (GlobalServiceRegister.getDefault().isServiceRegistered(IPigMapService.class)) {
            final IPigMapService service=(IPigMapService)GlobalServiceRegister.getDefault().getService(IPigMapService.class);
            service.setPigMapData(pigMapData);
          }
        }
      }
      if (dialog instanceof TrayDialog) {
        TrayDialog parentDialog=(TrayDialog)dialog;
        dialog.setDefaultExpression(tableManager.getExpressionFilter());
        dialog.addVariables(vars);
        if (Window.OK == parentDialog.open()) {
          String expressionForTable=dialog.getExpressionForTable();
          tableManager.setExpressionFilter(expressionForTable);
          tableManager.getEditPart().getViewer().getEditDomain().getCommandStack().execute(getFilterChangeCommand(tableManager.getModel(),expressionForTable));
        }
      }
    }
    @Override public void mouseReleased(    MouseEvent me){
    }
    @Override public void mouseDoubleClicked(    MouseEvent me){
    }
  }
);
}

Fixed version (ground truth):
@Override protected void addButtonListener(){
  IService expressionBuilderDialogService=GlobalServiceRegister.getDefault().getService(IExpressionBuilderDialogService.class);
  final IExpressionBuilderDialogController dialog=((IExpressionBuilderDialogService)expressionBuilderDialogService).getExpressionBuilderInstance(parent,null,null,null);
  button.addMouseListener(new MouseListener(){
    @Override public void mousePressed(    MouseEvent me){
      List<Variable> vars=new ArrayList<Variable>();
      if (tableManager.getModel() != null && (tableManager.getModel() instanceof InputTable || tableManager.getModel() instanceof OutputTable)) {
        if (tableManager.getModel().eContainer() != null && tableManager.getModel().eContainer() instanceof PigMapData) {
          PigMapData pigMapData=(PigMapData)tableManager.getModel().eContainer();
          List<InputTable> inputTables=pigMapData.getInputTables();
          for (          InputTable table : inputTables) {
            List<TableNode> nodes=table.getNodes();
            for (            TableNode node : nodes) {
              Variable variable=new Variable();
              variable.setName(table.getName());
              variable.setValue(node.getName());
              vars.add(variable);
            }
          }
          if (GlobalServiceRegister.getDefault().isServiceRegistered(IPigMapService.class)) {
            final IPigMapService service=(IPigMapService)GlobalServiceRegister.getDefault().getService(IPigMapService.class);
            service.setPigMapData(pigMapData);
          }
        }
      }
      if (dialog instanceof TrayDialog) {
        TrayDialog parentDialog=(TrayDialog)dialog;
        MapperManager mapperManger=(MapperManager)tableManager.getMapperManger();
        mapperManger.fireCurrentDirectEditApply();
        dialog.setDefaultExpression(tableManager.getExpressionFilter());
        dialog.addVariables(vars);
        if (Window.OK == parentDialog.open()) {
          String expressionForTable=dialog.getExpressionForTable();
          tableManager.setExpressionFilter(expressionForTable);
          tableManager.getEditPart().getViewer().getEditDomain().getCommandStack().execute(getFilterChangeCommand(tableManager.getModel(),expressionForTable));
        }
      }
    }
    @Override public void mouseReleased(    MouseEvent me){
    }
    @Override public void mouseDoubleClicked(    MouseEvent me){
    }
  }
);
}