Program: 139740
Project: 139740
Buggy source:
private ModelElement findMatchedModelElement(EObject parent,EObject similarElement){
  if (parent instanceof TdDataProvider) {
    if (similarElement instanceof TdSchema) {
      List<TdSchema> schemas=CatalogHelper.getSchemas((TdCatalog)selectedOjbect);
      if (schemas != null && schemas.size() > 0) {
        for (        TdSchema tdSchema : schemas) {
          if (tdSchema.getName().equalsIgnoreCase(((TdSchema)similarElement).getName())) {
            return tdSchema;
          }
        }
      }
      List<TdSchema> schames=DataProviderHelper.getTdSchema((DataProvider)parent);
      for (      TdSchema schame : schames) {
        if (schame.getName().equalsIgnoreCase(((TdSchema)similarElement).getName())) {
          return schame;
        }
      }
    }
    if (similarElement instanceof TdCatalog) {
      List<TdCatalog> catalogs=DataProviderHelper.getTdCatalogs((DataProvider)parent);
      for (      TdCatalog catalog : catalogs) {
        if (catalog.getName().equalsIgnoreCase(((TdCatalog)similarElement).getName())) {
          return catalog;
        }
      }
    }
  }
 else   if (parent instanceof Package) {
    List<ColumnSet> columnSets=new ArrayList<ColumnSet>();
    columnSets.addAll(PackageHelper.getTables((Package)parent));
    columnSets.addAll(PackageHelper.getViews((Package)parent));
    for (    ModelElement columnSet : columnSets) {
      if (((ColumnSet)columnSet).getName().equalsIgnoreCase(((ColumnSet)similarElement).getName())) {
        return columnSet;
      }
    }
  }
  return null;
}

Fixed version (ground truth):
private ModelElement findMatchedModelElement(EObject parent,EObject similarElement){
  if (parent instanceof TdDataProvider) {
    if (similarElement instanceof TdSchema) {
      if (selectedOjbect instanceof TdCatalog) {
        List<TdSchema> schemas=CatalogHelper.getSchemas((TdCatalog)selectedOjbect);
        if (schemas != null && schemas.size() > 0) {
          for (          TdSchema tdSchema : schemas) {
            if (tdSchema.getName().equalsIgnoreCase(((TdSchema)similarElement).getName())) {
              return tdSchema;
            }
          }
        }
      }
      List<TdSchema> schames=DataProviderHelper.getTdSchema((DataProvider)parent);
      for (      TdSchema schame : schames) {
        if (schame.getName().equalsIgnoreCase(((TdSchema)similarElement).getName())) {
          return schame;
        }
      }
    }
    if (similarElement instanceof TdCatalog) {
      List<TdCatalog> catalogs=DataProviderHelper.getTdCatalogs((DataProvider)parent);
      for (      TdCatalog catalog : catalogs) {
        if (catalog.getName().equalsIgnoreCase(((TdCatalog)similarElement).getName())) {
          return catalog;
        }
      }
    }
  }
 else   if (parent instanceof Package) {
    List<ColumnSet> columnSets=new ArrayList<ColumnSet>();
    columnSets.addAll(PackageHelper.getTables((Package)parent));
    columnSets.addAll(PackageHelper.getViews((Package)parent));
    for (    ModelElement columnSet : columnSets) {
      if (((ColumnSet)columnSet).getName().equalsIgnoreCase(((ColumnSet)similarElement).getName())) {
        return columnSet;
      }
    }
  }
  return null;
}