Program: 138801
Project: 138801
Buggy source:
@Override public void loadChildren(){
  ColumnSet columnSet=SwitchHelpers.COLUMN_SET_SWITCH.doSwitch((EObject)getParent());
  if (columnSet != null) {
    List<TdColumn> columnList=null;
    if (FILTER_FLAG) {
      String columnFilter=ColumnHelper.getColumnFilter(columnSet);
      columnList=filterColumns(ColumnSetHelper.getColumns(columnSet),columnFilter);
    }
 else {
      columnList=ColumnSetHelper.getColumns(columnSet);
    }
    if (columnList.size() > 0) {
      if (columnList.size() > COLUMN_MAX) {
        this.setChildren(null);
        MessageUI.openWarning(DefaultMessagesImpl.getString("String_Node_Str",COLUMN_MAX));
      }
 else {
        this.setChildren(columnList.toArray());
      }
      return;
    }
 else {
      if (FILTER_FLAG) {
        this.setChildren(null);
        if (ColumnSetHelper.getColumns(columnSet).size() > 0) {
          return;
        }
      }
    }
    Package parentCatalogOrSchema=ColumnSetHelper.getParentCatalogOrSchema(columnSet);
    if (parentCatalogOrSchema == null) {
      return;
    }
    Connection conn=DataProviderHelper.getTdDataProvider(parentCatalogOrSchema);
    if (conn == null) {
      return;
    }
    try {
      columnList=DqRepositoryViewService.getColumns(conn,columnSet,null,true);
      if (columnList.size() > COLUMN_MAX) {
        this.setChildren(null);
        MessageUI.openWarning(DefaultMessagesImpl.getString("String_Node_Str",COLUMN_MAX));
        return;
      }
    }
 catch (    TalendException e) {
      MessageBoxExceptionHandler.process(e);
    }
    this.setChildren(columnList.toArray());
    ProxyRepositoryViewObject.fetchAllDBRepositoryViewObjects(Boolean.TRUE);
    ProxyRepositoryViewObject.save(conn);
  }
  super.loadChildren();
}

Fixed version (ground truth):
@Override public void loadChildren(){
  ColumnSet columnSet=SwitchHelpers.COLUMN_SET_SWITCH.doSwitch((EObject)getParent());
  if (columnSet != null) {
    List<TdColumn> columnList=null;
    if (FILTER_FLAG) {
      String columnFilter=ColumnHelper.getColumnFilter(columnSet);
      columnList=filterColumns(ColumnSetHelper.getColumns(columnSet),columnFilter);
    }
 else {
      columnList=ColumnSetHelper.getColumns(columnSet);
    }
    if (columnList.size() > 0) {
      if (columnList.size() > COLUMN_MAX) {
        this.setChildren(null);
        MessageUI.openWarning(DefaultMessagesImpl.getString("String_Node_Str",COLUMN_MAX));
      }
 else {
        this.setChildren(columnList.toArray());
      }
      return;
    }
 else {
      if (FILTER_FLAG) {
        this.setChildren(null);
        if (ColumnSetHelper.getColumns(columnSet).size() > 0) {
          return;
        }
      }
    }
    if (columnSet.eIsProxy()) {
      columnSet=(ColumnSet)EObjectHelper.resolveObject(columnSet);
    }
    Package parentCatalogOrSchema=ColumnSetHelper.getParentCatalogOrSchema(columnSet);
    if (parentCatalogOrSchema == null) {
      return;
    }
    Connection conn=ConnectionHelper.getTdDataProvider(parentCatalogOrSchema);
    if (conn == null) {
      return;
    }
    try {
      columnList=DqRepositoryViewService.getColumns(conn,columnSet,null,true);
      if (columnList.size() > COLUMN_MAX) {
        this.setChildren(null);
        MessageUI.openWarning(DefaultMessagesImpl.getString("String_Node_Str",COLUMN_MAX));
        return;
      }
    }
 catch (    TalendException e) {
      MessageBoxExceptionHandler.process(e);
    }
    this.setChildren(columnList.toArray());
    ProxyRepositoryViewObject.save(conn);
  }
  super.loadChildren();
}