release-25.3: sql: add distsql_prevent_partitioning_soft_limited_scans #160629
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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.
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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. |
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Jan 7, 2026
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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.