From c382cb17d473d6b6820c028ef1db9dbb95531cdb Mon Sep 17 00:00:00 2001 From: Florence Morris Date: Fri, 3 May 2024 14:11:04 -0400 Subject: [PATCH] fixed version in link --- src/current/_includes/releases/v23.1/v23.1.21.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/current/_includes/releases/v23.1/v23.1.21.md b/src/current/_includes/releases/v23.1/v23.1.21.md index f1fc301a49a..5e6c7e5759d 100644 --- a/src/current/_includes/releases/v23.1/v23.1.21.md +++ b/src/current/_includes/releases/v23.1/v23.1.21.md @@ -31,7 +31,7 @@ Release Date: May 7, 2024

Performance improvements

-- More efficient [query plans]({% link v23.1/cost-based-optimizer.md %}) are now generated for queries with text similarity filters, for example, `text_col % 'foobar'`. These plans are generated if the `optimizer_use_trigram_similarity_optimization` [session setting]({% link v24.1/set-vars.md %}) is enabled. It is disabled by default. [#122683][#122683] +- More efficient [query plans]({% link v23.1/cost-based-optimizer.md %}) are now generated for queries with text similarity filters, for example, `text_col % 'foobar'`. These plans are generated if the `optimizer_use_trigram_similarity_optimization` [session setting]({% link v23.1/set-vars.md %}) is enabled. It is disabled by default. [#122683][#122683] - Added a new [session variable]({% link v23.1/set-vars.md %}) `optimizer_use_improved_zigzag_join_costing`. When enabled, the cost of [zigzag joins]({% link v23.1/cost-based-optimizer.md %}#zigzag-joins) is updated so zigzag joins will only be chosen over scans if the zigzag joins produce fewer rows. This change only applies if the session variable `enable_zigzag_join` is also `on`. [#123068][#123068] - Improved the selectivity estimation of multi-column filters by the [optimizer]({% link v23.1/cost-based-optimizer.md %}) when the multi-column distinct count is high. This avoids cases where CockroachDB significantly over-estimates the selectivity of a multi-column predicate and as a result can prevent the optimizer from choosing a bad query plan. [#123068][#123068]