These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.06 s (backtrack: 0/20).

[ebuild  N     ] dev-db/unixODBC-2.3.14::gentoo  USE="minimal unicode -odbcmanual -static-libs" 1718 KiB
[ebuild  N     ] dev-db/mariadb-connector-c-3.4.9-r2:0/3::gentoo  USE="curl -gnutls -kerberos -static-libs -test" 1352 KiB
[ebuild  N     ] dev-db/mariadb-connector-odbc-3.1.24:0/3.1::gentoo  USE="ssl" 565 KiB

Total: 3 packages (3 new), Size of downloads: 3634 KiB