The Debian and Ubuntu unixodbc packages have used a 64-bit SQLLEN from their inception on 64-bit architectures. This was a deviation from the upstream ABI of course, but the upstream ABI was broken on 64-bit systems (as upstream knows, which is why they changed it).
On 32-bit architectures, SQLLEN is 32-bit per the ODBC definition. This has also never changed (upstream or in the distro).
The Debian and Ubuntu unixodbc packages have used a 64-bit SQLLEN from their inception on 64-bit architectures. This was a deviation from the upstream ABI of course, but the upstream ABI was broken on 64-bit systems (as upstream knows, which is why they changed it).
On 32-bit architectures, SQLLEN is 32-bit per the ODBC definition. This has also never changed (upstream or in the distro).