Most results are for single server setup. The server is: two socket Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz; 128 GiB RAM; md RAID-5 on 8 6TB SATA HDD; ext4.
Some additional results (marked as x2, x3, x6) are for clustered setup for comparison. These results are contributed from independent teams and hardware specification may differ.
Disclaimer: some results are significantly outdated. Results for MonetDB was obtained at 2013 for version v11.15.11 (Feb2013-SP3). Results for MemSQL was obtained at 2015 for version 3.2. Results for Vertica are from 2015 for version 7.1.1.