Add ability to return MAP type columns with ARRAY, MAP or ROW keys

[hashhar]

Describe the feature

Today the Python client fails with an error when returning MAP columns with ARRAY, MAP or ROW keys.

See the tests added in #441 for the behavior.

Describe alternatives you've considered

Using legacy_primitive_types=True is able to return the data but in a non-standard format and requires user to reverse-engineer how Trino serialized the column.

Note that the JDBC driver doesn't work with such columns either at the moment.

Are you willing to submit PR?

• Yes I am willing to submit a PR!