ClickHouse and The One Trillion Row Challenge

The text discusses the successful completion of a challenge set by Gunnar Morling from Decodable, which required users to write a Java program to compute each city's minimum, average, and maximum temperatures from a text file containing 1 billion measurements. Using ClickHouse, the response time was around 19 seconds using the exact hardware profile stipulated by the rules. The challenge was later extended to 1 trillion rows by Dask, prompting the authors to attempt querying this larger dataset. They achieved this in under 3 minutes for $0.56 using spot instances in AWS and a ClickHouse cluster. The text also provides details on how they optimized their settings and queries to achieve these results.