atoti_directquery_clickhouse.TableConfig#
- final class atoti_directquery_clickhouse.TableConfig#
Config passed to
add_external_table().- clustering_columns: AbstractSet[str] = frozenset({})#
The names of the columns used for clustering.
Feeding aggregate providers from an external database can result in very large queries to be run on this database. Clustering columns split up queries made by DirectQuery to the external database when feeding aggregate providers.