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Type: Task
Resolution: Unresolved
Priority: Major - P3
Fix Version/s: None
Affects Version/s: None
Component/s: None
Labels:
- M2
- join-explain

Assigned Teams:

Query Optimization
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

Parent ticket for the join optimizer explain changes. Tracks documenting the new explain output: planSummary, the joinOptimizer object, internalEnableDetailedJoinExplain via query settings, the join node fields, and the hash join child order.

depends on

SERVER-138705 Make the right child the build side of HASH_JOIN query solution nodes

Open

SERVER-138706 Add planSummary to explain winningPlan for single-collection plans

Open

SERVER-138707 Render join plans in explain planSummary

Open

SERVER-138708 Rework join optimizer rejectedPlans in explain

Open

SERVER-138703 Rename detailed join estimate fields in explain

In Code Review

SERVER-139076 Report all estimated NDVs and rename selectivity in join explain ndvEstimates

In Code Review

SERVER-138704 Rework join node serialization in explain

In Progress

SERVER-138701 Rename internalQueryExplainJoinCostComponents and make it settable via query settings

Closed

SERVER-138702 Group join optimizer explain fields under queryPlanner.joinOptimizer

Closed

(4 depends on)

Assignee:: Max Verbinnen
Reporter:: Max Verbinnen
Participants:: Max Verbinnen
Votes:: 0 Vote for this issue
Watchers:: 1 Start watching this issue

Created:: Nov 05 2026 02:01:43 PM UTC
Updated:: Nov 10 2026 11:51:33 AM UTC

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PagerDuty