message: use StorageOid to delete common column
diff: @@ -441,16 +441,7 @@ unique_ptr<CatalogEntry> TableCatalogEntry::RemoveColumn(ClientContext &context,
  return make_unique<TableCatalogEntry>(catalog, schema, (BoundCreateTableInfo *)bound_create_info.get(),
  storage);
  }
  -
  - // We need to skip generated columns because they are not in 'storage'
  - column_t storage_index = removed_index;
  - for (column_t i = 0; i < removed_index; i++) {
  - if (columns[i].Generated()) {
  - storage_index--;
  - }
  - }
  -
  - auto new_storage = make_shared<DataTable>(context, *storage, storage_index);
  + auto new_storage = make_shared<DataTable>(context, *storage, columns[removed_index].StorageOid());
  return make_unique<TableCatalogEntry>(catalog, schema, (BoundCreateTableInfo *)bound_create_info.get(),
  new_storage);
  }
  