Apache Kylin was actually China’s very first top-level Apache project. It did come out of eBay, but the work all originated in China. It’s a really cool solution to query acceleration.

You can learn about it on the community page here: http://kylin.apache.org/

It’s pretty popular across China, and I’ve seen it come up a bunch in Europe/South America, but in the U.S. it’s pretty new to a lot of folks.