not support jsonb when read_sql postgre table to arrow

[wonb168]

I use duckdb as OLAP plugin for postgre.
I need export data from pg to duckdb, and there have jsonb column in my pg table, when I use connectorx to read_sql to arrow, raise error:
RuntimeError: No conversion rule from JSONB(true) to connectorx::destinations::arrow::typesystem::ArrowTypeSystem.
So，I want：

1. support jsonb when etl pg to arrow (duckdb can read arrow)
2. directly add duckdb as return_type for read_sql()

[wangxiaoying]

Hi @wonb168 , thanks for the issue. For jsonb, can you try to set the return type as arrow2?

For adding duckdb, I think it will be the same with supporting to_sql #213, will add your request into the discussion.

[wonb168]

but int[] in my greeplun(int array column,like {1,2,3}) etl to arrow2 also error:
RuntimeError: No conversion rule from Int4Array(true) to connectorx::destinations::arrow::typesystem::ArrowTypeSystem.