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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[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-perl/DBD-MariaDB-1.230.0-r1::gentoo  USE="mariadb -minimal -mysql -test" PERL_FEATURES="ithreads (-debug) -quadmath" 183 KiB

Total: 2 packages (2 new), Size of downloads: 1534 KiB