presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/RemoteTableNameCacheKey.java/RemoteTableNameCacheKey/RemoteTableNameCacheKey
class RemoteTableNameCacheKey:    RemoteTableNameCacheKey(JdbcIdentity identity, String schema)
    {
        this.identity = requireNonNull(identity, "identity is null");
        this.schema = requireNonNull(schema, "schema is null");
    }