good first issuetypes
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Description
DuckDB allows arrays to have a fixed length. But returning those from a query currently throws an error that we don't support the type.
select * from duckdb.query($$ select [1, 2]::int[2] $$);
WARNING: 01000: (PGDuckDB/GetPostgresDuckDBType) Could not convert DuckDB type: INTEGER[2] to Postgres type
LOCATION: GetPostgresDuckDBType, pgduckdb_types.cpp:1098
ERROR: XX000: (PGDuckDB/CreatePlan) Cache lookup failed for type 0
LOCATION: CreatePlan, pgduckdb_planner.cpp:76
It should be pretty simple to support these by simply converting them to a postgres array type (without a specified length). i.e. convert INTEGER[2] to INTEGER[] automatically.
Once we do this we should be able to un-exclude a bunch of these lines: https://github.com/duckdb/pg_duckdb/blob/02ebeaec1b42619fab806fc881e67de0821b380d/test/regression/expected/test_all_types.out#L21-L27