jstest + design: single-component system variable in $lookup join predicate crash

XMLWordPrintableJSON

    • Type: Task
    • Resolution: Unresolved
    • Priority: Major - P3
    • None
    • Affects Version/s: None
    • Component/s: None
    • None
    • None
    • None
    • None
    • None
    • None
    • None
    • None

      Companion artifact for SERVER-126396 (planner crash on single-component `$$NOW`/`$$ROOT`/`$$CURRENT` in $lookup predicate).

      Roots at `PredicateExtractor::extractExpressionCompare()` in predicate_extractor.cpp calling `ExpressionFieldPath::getFieldPathWithoutCurrentPrefix()` → tassert 16409 at field_path.h:178. Proposes `getPathLength() <= 1` guard at 3 sites + `isSingleComponentSysvar()` helper.

      Files in worktree mongo-w4-4:

      • jstests/aggregation/sources/lookup/lookup_single_component_sysvar_predicate.js
      • src/mongo/db/pipeline/SERVER-126396-design.md

      Status: Draft.

            Assignee:
            Unassigned
            Reporter:
            Mehar Grewal
            Votes:
            0 Vote for this issue
            Watchers:
            1 Start watching this issue

              Created:
              Updated: