presto-main/src/main/java/io/prestosql/connector/system/MetadataBasedSystemTablesProvider.java/MetadataBasedSystemTablesProvider/MetadataBasedSystemTablesProvider
class MetadataBasedSystemTablesProvider:    public MetadataBasedSystemTablesProvider(Metadata metadata, String catalogName)
    {
        this.metadata = requireNonNull(metadata, "metadata is null");
        this.catalogName = requireNonNull(catalogName, "catalogName is null");
    }