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

Calculating dependencies ... done!
Dependency resolution took 1.05 s (backtrack: 0/20).

[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] app-arch/snappy-1.2.2-r1:0/1.1::gentoo  USE="-test" CPU_FLAGS_X86="avx avx2" 1083 KiB
[ebuild  N     ] dev-cpp/gflags-2.2.2-r1:0/2.2::gentoo  USE="-static-libs -test" 97 KiB
[ebuild  N     ] sys-libs/liburing-2.15:0/2::gentoo  USE="-examples -static-libs -test" 538 KiB
[ebuild  N     ] sys-process/numactl-2.0.19::gentoo  USE="-static-libs" 441 KiB
[ebuild  N     ] dev-libs/rocksdb-10.5.1::gentoo  USE="-jemalloc -numa -static-libs -tbb -test" 13540 KiB

Total: 6 packages (6 new), Size of downloads: 16075 KiB