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