ClickHouse has introduced two new pull requests that improve JOIN performance by multiple orders of magnitude. The optimizations include JOIN predicate pushdown using equivalence classes and automatic conversion of OUTER JOINs to INNER JOINs. These optimizations significantly reduce the amount of data processed, improve index usage, and enhance query speed.
Table of contents
PR #1: JOIN predicate pushdown using equivalence classesPR #2: Automatically converting OUTER to INNER JOINConclusion43 Impressions