release-25.3.7-rc: sql: add distsql_prevent_partitioning_soft_limited_scans #160604
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Add a setting to the physical planner which prevents partitioning of soft-limited scans, to make them match hard-limited scans. This makes them lazier. Fixes: cockroachdb#160530 Release note (performance improvement): Add a new session variable, `distsql_prevent_partitioning_soft_limited_scans`, which, when true, prevents scans with soft limits from being planned as multiple TableReaders by the physical planner. This should decrease the initial setup costs of some fully-distributed query plans.
|
Thanks for opening a backport. Before merging, please confirm that the change does not break backwards compatibility and otherwise complies with the backport policy. Include a brief release justification in the PR description explaining why the backport is appropriate. All backports must be reviewed by the TL for the owning area. While the stricter LTS policy does not yet apply, please exercise judgment and consider gating non-critical changes behind a disabled-by-default feature flag when appropriate. |
blathers-crl
bot
added
backport
Member
|
This change is |
michae2
approved these changes
Jan 7, 2026
Member
Author
|
blathers backport release-25.3 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backport 1/2 commits from #160051.
/cc @cockroachdb/release
sql: add distsql_prevent_partitioning_soft_limited_scans
Add a setting to the physical planner which prevents partitioning of soft-limited scans, to make them match hard-limited scans. This makes them lazier.
Fixes: #160530
Release note (performance improvement): Add a new session variable,
distsql_prevent_partitioning_soft_limited_scans, which, when true, prevents scans with soft limits from being planned as multiple TableReaders by the physical planner. This should decrease the initial setup costs of some fully-distributed query plans.Release justification: off by default, performance improvement.