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Fix Rule 3: CouldNotGenerateValidParallelPlan stays Warning #799

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Merged
erikdarlingdata merged 1 commit into from
Apr 7, 2026
+6 −4
Merged

Fix Rule 3: CouldNotGenerateValidParallelPlan stays Warning #799

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5 changes: 3 additions & 2 deletions Dashboard/Services/PlanAnalyzer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -55,13 +55,14 @@
_ => stmt.NonParallelPlanReason
};

var isExplicit = stmt.NonParallelPlanReason is "MaxDOPSetToOne" or "QueryHintNoParallelSet";
var isActionable = stmt.NonParallelPlanReason is "MaxDOPSetToOne"
or "QueryHintNoParallelSet" or "CouldNotGenerateValidParallelPlan";

stmt.PlanWarnings.Add(new PlanWarning
{
WarningType = "Serial Plan",
Message = $"Query running serially: {reason}.",
Severity = isExplicit ? PlanWarningSeverity.Warning : PlanWarningSeverity.Info
Severity = isActionable ? PlanWarningSeverity.Warning : PlanWarningSeverity.Info
});
}

Expand Down Expand Up @@ -875,7 +876,7 @@
// Rule 28: Row Count Spool — NOT IN with nullable column
// Pattern: Row Count Spool with high rewinds, child scan has IS NULL predicate,
// and statement text contains NOT IN
if (node.PhysicalOp.Contains("Row Count Spool"))

Check warning on line 879 in Dashboard/Services/PlanAnalyzer.cs

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GitHub Actions / build 

Dereference of a possibly null reference.

Check warning on line 879 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Dereference of a possibly null reference.

Check warning on line 879 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Dereference of a possibly null reference.

Check warning on line 879 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Dereference of a possibly null reference.

Check warning on line 879 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Dereference of a possibly null reference.
{
var rewinds = node.HasActualStats ? (double)node.ActualRewinds : node.EstimateRewinds;
if (rewinds > 10000 && HasNotInPattern(node, stmt))
Expand Down
5 changes: 3 additions & 2 deletions Lite/Services/PlanAnalyzer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -55,13 +55,14 @@
_ => stmt.NonParallelPlanReason
};

var isExplicit = stmt.NonParallelPlanReason is "MaxDOPSetToOne" or "QueryHintNoParallelSet";
var isActionable = stmt.NonParallelPlanReason is "MaxDOPSetToOne"
or "QueryHintNoParallelSet" or "CouldNotGenerateValidParallelPlan";

stmt.PlanWarnings.Add(new PlanWarning
{
WarningType = "Serial Plan",
Message = $"Query running serially: {reason}.",
Severity = isExplicit ? PlanWarningSeverity.Warning : PlanWarningSeverity.Info
Severity = isActionable ? PlanWarningSeverity.Warning : PlanWarningSeverity.Info
});
}

Expand Down Expand Up @@ -874,7 +875,7 @@
// Rule 28: Row Count Spool — NOT IN with nullable column
// Pattern: Row Count Spool with high rewinds, child scan has IS NULL predicate,
// and statement text contains NOT IN
if (node.PhysicalOp.Contains("Row Count Spool"))

Check warning on line 878 in Lite/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Dereference of a possibly null reference.
{
var rewinds = node.HasActualStats ? (double)node.ActualRewinds : node.EstimateRewinds;
if (rewinds > 10000 && HasNotInPattern(node, stmt))
Expand Down
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