Skip to content

Rule 15: Use Merge Interval for OR expansion detection #349

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
erikdarlingdata merged 1 commit into from
Feb 27, 2026
Merged

Rule 15: Use Merge Interval for OR expansion detection #349

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 6 additions & 6 deletions Dashboard/Services/PlanAnalyzer.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -399,15 +399,15 @@
}
}

// Rule 15: Join OR clause (Concatenation + Constant Scan pattern)
// Pattern: Concatenation → Compute Scalar → Constant Scan (one per OR branch)
// Rule 15: Join OR clause (Concatenation + Constant Scan under Merge Interval)
// Pattern: Merge Interval → TopN Sort → Concatenation → Constant Scans
if (node.PhysicalOp == "Concatenation")
{
var constantScanBranches = node.Children
.Count(c => c.PhysicalOp == "Constant Scan" ||
c.Children.Any(gc => gc.PhysicalOp == "Constant Scan"));

if (constantScanBranches >= 2 && HasJoinAncestor(node))
if (constantScanBranches >= 2 && HasMergeIntervalAncestor(node))
{
node.Warnings.Add(new PlanWarning
{
Expand Down Expand Up @@ -463,7 +463,7 @@

// Rule 22: Table variables (Object name starts with @)
if (!string.IsNullOrEmpty(node.ObjectName) &&
node.ObjectName.Contains("@"))

Check warning on line 466 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Dashboard/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)
{
node.Warnings.Add(new PlanWarning
{
Expand Down Expand Up @@ -612,14 +612,14 @@
}

/// <summary>
/// Checks whether a node has a join operator as an ancestor.
/// Checks whether a node has a Merge Interval ancestor (OR expansion pattern).
/// </summary>
private static bool HasJoinAncestor(PlanNode node)
private static bool HasMergeIntervalAncestor(PlanNode node)
{
var ancestor = node.Parent;
while (ancestor != null)
{
if (ancestor.LogicalOp.Contains("Join", StringComparison.OrdinalIgnoreCase))
if (ancestor.PhysicalOp == "Merge Interval")
return true;
ancestor = ancestor.Parent;
}
Expand Down
12 changes: 6 additions & 6 deletions Lite/Services/PlanAnalyzer.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -399,15 +399,15 @@
}
}

// Rule 15: Join OR clause (Concatenation + Constant Scan pattern)
// Pattern: Concatenation → Compute Scalar → Constant Scan (one per OR branch)
// Rule 15: Join OR clause (Concatenation + Constant Scan under Merge Interval)
// Pattern: Merge Interval → TopN Sort → Concatenation → Constant Scans
if (node.PhysicalOp == "Concatenation")
{
var constantScanBranches = node.Children
.Count(c => c.PhysicalOp == "Constant Scan" ||
c.Children.Any(gc => gc.PhysicalOp == "Constant Scan"));

if (constantScanBranches >= 2 && HasJoinAncestor(node))
if (constantScanBranches >= 2 && HasMergeIntervalAncestor(node))
{
node.Warnings.Add(new PlanWarning
{
Expand Down Expand Up @@ -463,7 +463,7 @@

// Rule 22: Table variables (Object name starts with @)
if (!string.IsNullOrEmpty(node.ObjectName) &&
node.ObjectName.Contains("@"))

Check warning on line 466 in Lite/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Lite/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Lite/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)

Check warning on line 466 in Lite/Services/PlanAnalyzer.cs

View workflow job for this annotation

GitHub Actions / build 

Use 'string.Contains(char)' instead of 'string.Contains(string)' when searching for a single character (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1847)
{
node.Warnings.Add(new PlanWarning
{
Expand Down Expand Up @@ -612,14 +612,14 @@
}

/// <summary>
/// Checks whether a node has a join operator as an ancestor.
/// Checks whether a node has a Merge Interval ancestor (OR expansion pattern).
/// </summary>
private static bool HasJoinAncestor(PlanNode node)
private static bool HasMergeIntervalAncestor(PlanNode node)
{
var ancestor = node.Parent;
while (ancestor != null)
{
if (ancestor.LogicalOp.Contains("Join", StringComparison.OrdinalIgnoreCase))
if (ancestor.PhysicalOp == "Merge Interval")
return true;
ancestor = ancestor.Parent;
}
Expand Down
Loading