Add option(s) to get result column without column name

[jakipatryk]

Background

Sometimes it it useful to get result (from QueryResultRow) column without column name. For example, when function returns single result, and it is not named:

CREATE OR REPLACE FUNCTION public.convert_old_schema_to_new_schema(
    IN  i_old_schema JSONB
) RETURNS JSONB AS
$$

Currently I believe one has to use raw Java resultSet of QueryResultRow to get column with index 1, balta doesn't support that directly.

Feature

Option (or options) to get QueryResultRow column value without column name, for example by index, or if is has only one column - without anything.