clintropolis opened a new pull request, #15550: URL: https://github.com/apache/druid/pull/15550
### Description Removes the 'auto' strategy from the native search query to simplify `BitmapColumnIndex` to remove the `estimateSelectivity` method. The 'auto' strategy is not on by default, and in some cases can be rather expensive since for logical filters like AND/OR we fetch all of the indexes, compute the cardinality of each of them, and then throw them away, sometimes to turn around and do the same thing again to actually use the indexes. The replacement for this will be smarter usage of indexes for all query types, as a follow-up I plan to bring the enhancements of #13977 to classic string typed columns, and I've got some additional improvements coming in the future. [Related dev mailing list thread](https://lists.apache.org/thread/8lbgbo2977c88xxp714znmkg3w2lbkdj) (This release note is currently a lie, but a follow-up PR will make it more true.) #### Release note The 'auto' strategy has been removed from the [search query](https://druid.apache.org/docs/latest/querying/searchquery). Specifying 'auto' will now be equivalent to specifying 'useIndexes'. Improvements to how and when indexes are computed in general have allowed 'useIndexes' to benefit and be more adaptive when it uses indexes for filter processing, skipping computing expensive indexes when possible. <hr> This PR has: - [x] been self-reviewed. - [x] added documentation for new or modified features or behaviors. - [x] a release note entry in the PR description. - [x] been tested in a test Druid cluster. -- 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]
