cannot insert into a UInt64 column

[universalmind303]

Description

I noticed this while reviewing #2298

> create table test (value bigint unsigned);
Table created
> insert into test values (9223372036854775807); -- (i64::max)
Inserted 1 row
> insert into test values (9223372036854775808); -- (i64::max + 1)
Error: External error: External error: Generic DeltaTable error: External error: Arrow error: Cast error: Can't cast value 9223372036854775808 to type Int64

we can see that the dtype was properly set on the table

> describe test;
┌─────────────┬───────────┬─────────────┐
│ column_name │ data_type │ is_nullable │
│ ──          │ ──        │ ──          │
│ Utf8        │ Utf8      │ Boolean     │
╞═════════════╪═══════════╪═════════════╡
│ value       │ UInt64    │ true        │
└─────────────┴───────────┴─────────────┘

it seems like something is failing when writing to the delta tables.

[vrongmeal]

I think this is because we don’t support creating unsigned integer fields (since PG doesn’t have unsigned ints). We should definitely change it though. This is technically a feature rather than a bug.