ebyhr opened a new pull request, #18513: URL: https://github.com/apache/iceberg/pull/18513
Theta sketch computation for NDV column statistics is slow in some workloads, causing a 10-20% insert slowdown in Trino. - https://github.com/trinodb/trino/pull/31173 That PR adds an HLL option but has to store it as an engine-specific blob type, because the Puffin spec has no standard HLL type. This adds `apache-datasketches-hll-v1`, a compact [Apache DataSketches HLL sketch](https://datasketches.apache.org/docs/HLL/HllSketches.html) with an `ndv` property, so engines can share HLL-based NDV statistics. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
