Support for UInt128, UInt256 (and others)

Hi, I'm trying to read a `Number` field from an Oracle database that contains an IPv6 address that was converted to its Decimal representation. Support for UInt128 (and 256) are missing from odbc-driver so I tried to create my field in my ClickHouse table as Decimal256(0) but that didn't work.
I also tried to making this field a `String` and try to convert it as part of my query but that didn't work either, the number was getting truncated.
Would an array of UInt64[2] work?

Can you think of a clever way to read that field in, short of implementing support for UInt128? Thanks!