feat(dtypes): fall back to dt.unknown for unknown types
#9576
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We've had a number of issues where we haven't exposed a mapping to a particular (usually Postgres) dtype. We'll still have requests to provide useful mappings, depending on the upstream dtype, but this should prevent users being unable to even open a table because there's an unknown / user-defined dtype present in the table. To test, I've removed the special handling for the `vector` and `ts.vector` types that we were explicitly mapping to `dt.unknown`.
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We've had a number of issues where we haven't exposed a mapping to a
particular (usually Postgres) dtype.
We'll still have requests to provide useful mappings, depending on the
upstream dtype, but this should prevent users being unable to even open
a table because there's an unknown / user-defined dtype present in the
table.
To test, I've removed the special handling for the
vectorandts.vectortypes that we were explicitly mapping todt.unknown.Trying this one again...