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🔵 Needs a closer look
Compiler support for the query-level pragma in LabelInCase.ql needs confirmation because the documented select-clause grammar does not include annotations.
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What changed in this PR
Disables dynamic join ordering for selected JavaScript predicates and a query to avoid poor runtime join plans when the opt-in orderer is enabled.
Changes:
- Adds
no_dynamic_join_orderto five library predicates and theLabelInCasequery. - Leaves predicate bodies and query logic unchanged.
| File | Description |
|---|---|
javascript/ql/src/Statements/LabelInCase.ql |
Adds a query-level ordering opt-out. |
javascript/ql/lib/semmle/javascript/Regexp.qll |
Disables dynamic ordering for regExpSource. |
javascript/ql/lib/semmle/javascript/RangeAnalysis.qll |
Disables dynamic ordering for hasNaNIndicator. |
javascript/ql/lib/semmle/javascript/dataflow/Nodes.qll |
Disables dynamic ordering for regular-expression reference tracking. |
javascript/ql/lib/semmle/javascript/dataflow/DataFlow.qll |
Disables dynamic ordering for localFieldStep. |
javascript/ql/lib/semmle/javascript/AST.qll |
Disables dynamic ordering for getFirstControlFlowNode. |
Review effort: Max
kaspersv
marked this pull request as draft
October 26, 2026 11:22
This branch has not been deployed
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We are working on a new dynamic join orderer for CodeQL that join orders predicates at evaluation-time using run-time cardinality information instead of relying on a statically chosen join order decided at compilation-time. At the moment a couple of JS predicates are join ordered badly by the dynamic join orderer. This PR disables dynamic join ordering for the affected predicates.
Dynamic join ordering is still disabled by default during compilation and evaluation and the
no_dynamic_join_orderpragma has no effect on compilation when dynamic join ordering is not explicitly enabled during compilation.