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Analysis JSON reopens evidence and is not redacted on download. Markdown is a readable report, not an evidence import. Files have no CH Query expiry. Review privacy.

Two runs · one shareable link

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Keep the baseline here. Paste this into the conversation where you are revising the query, then paste the returned analysis link into Candidate below.

Keep our original ClickHouse query and its evidence unchanged as the baseline. For the revision we agreed on, follow https://chquery.com/llms-full.txt and return a separate candidate analysis link for CH Query, without uploading. Ask which baseline and revision if they are unclear. Use only permissions already explicitly granted in this conversation; this prompt grants no new database access, query execution, benchmarks, setting changes, uploads or sharing. Keep measurements tied to the exact query they describe. State whether result correctness was checked, and distinguish plan changes from measured improvements.
Hypothesis & correctness assertions

Author assertions only. Equal SQL, plans or row counts do not prove equivalent results.

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Explore comparison evidence

Evidence pages preserve source text. Operator lists use role-local addresses, not cross-run identities. Correspondence is heuristic.


      
Keep the evidence together
Save & share this comparison
One link reopens the baseline, candidate, and included hypothesis and correctness notes. Review the snapshot, then choose encrypted seven-day storage. No file handoff needed.
Explicitly omit optional evidence
Partial redaction can leave identifiers, small numbers, DDL, provenance and unsupported fields sensitive. Inspect the complete outgoing snapshot.

      
Review your snapshot

      
Offline copies & reports
Optional fallback. Reviewed copies require the same review and confirmation above. Full source is unredacted and can contain private metadata.

      

    

    

      

        

        
See the shape of your query.

        
Paste ClickHouse EXPLAIN output. Analysis stays in your browser. You choose what to share.

        

        

        

          
          
          
or drop a file · 

        

        

        

          
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Or hand this to your agent

            

              Use https://chquery.com/llms.txt to review the ClickHouse query in this conversation. Send me one CH Query link.
              
            

            

          

      

    


    

      

        
Example · Public sample
Follow the repeated reads of actors.

        
From the analysis workspace: a 14-second look at the plan and its evidence.

      

      

        

          CH Query analysis of the public actors sample. Seven separate reads share a table-wide estimate; per-read work and runtime are unknown. Full evidence is described below.
          
            
            
          
        

        
Map → read detail → table-wide evidence. Captured from CH Query using the bundled public sample, not a measured benchmark.

      

      

        

        
      

      

      
    
        
  1. Overview
    This public capture has 52 plan operators. The workspace groups them into 34 stages, preserving their dependencies.
    2. 
        
  2. Repeated reads
    Seven separate ReadFromMergeTree operators refer to default.actors. Each reports 4/4 selected granules in the plan, not measured runtime work.
    3. 
        
  3. Supporting evidence
    EXPLAIN ESTIMATE supplies 235,753 rows, 7 parts and 28 marks for the table as a whole. Per-read row counts and runtime are unknown; no speedup is measured.
    4. 
      

      
Public ClickHouse Playground capture · September 8, 2026 · 26.9.1.52. Inspect the captured bundle. Opening the example keeps your in-tab personal work and draft available.

    


    

    

      

        

          
Example · Public sample
Query workspace

        

        

          
Example · a cohort leaderboard over actors
Explore the plan ↓

          
Loading the example plan…

          
A complex analytical query, ready to explore. Select a stage to follow its dependencies.
View example SQL & source
Captured from the public ClickHouse Playground on September 8, 2026 (26.9.1.52). EXPLAIN only; no measured runtime. The combined table estimate cannot be allocated to individual reads. Inspect the complete captured bundle.

        

        

          
Query

          

          
More

          

          
Discuss a scoped review of one query
Inspect the evidence and missing context first. To discuss a review with Shenandoah, email Max Sumrall with the question you want to resolve. Decide what evidence to share after agreeing the scope. This opens your email app without attaching SQL, notes or a link.

        

        

          Load a plan to explore its steps.
        

        
        
          
          
How to read this map

          
ReadJoin / unionAggregate / filterSort / window

          
Lines show dependencies. When every input has a scan estimate, width scales logarithmically with estimated input rows (1.5–6px); otherwise every line is 2px. These are not measured output rows.

          
Color identifies the operation, not cost.

          
Scan estimates and granule pruning are not execution cost. Scan estimates are not measured output rows.

          
A list with no actionable finding is not a health certificate.

          
Click or Enter to inspect. Double-click a stack to expand it. Arrow keys follow neighbours. / searches, F fits, − / + zoom, Escape closes the inspector.

          
Sources → ResultDependencies, not volume · Drag to explore · Fit for overview

        
        

          

            

              
Evidence Waiting

              

                
Original query
SQL context
Missing

                
Query plan
EXPLAIN PLAN JSON
Missing

                
Table statistics
EXPLAIN ESTIMATE
Missing

                
Server & settings
Version, Cloud, changed settings
Optional

              

              

                
              

            

            
Run summary Empty
Load evidence to see plan counts and selected granules.

            
SQL excerptNo query loaded
No SQL provided.

          


          

            

              

                

                  
                  
                  
                  
                

                

              

                
                
100%

              

              
⋯

                
                
                
              

                

                
              

              

              

              

                

                  
No plan loaded
Open the wizard or import a bundle.
Result
Join
ReadFromMergeTree

                

                

                

                

                  

                  

                

              

            

          

          

            
Selected step
Select a node to inspect rows, selectivity, indexes, and findings.

            
Raw evidence
No step selected.

            
One thing to try
Waiting for evidence

          

          
Worth a look
Repeated reads of actors
One thing to try — inspect whether the location aggregates could share work.

        

        
Derived from plan

      

    


    
Findings.
Load a plan to see findings.

    
Server.
No server information in this bundle.

  


  

    

      

        
Manual collection · stays in this browser
Analyze your query
Paste your SQL and its ClickHouse plan. CH Query never connects to your database or executes a query.

        
      

      

      

      

      

        
1
Original SQL
Paste one SELECT or WITH query. Your text is preserved unchanged.

        
        
Enter one SELECT or WITH query.

        
      

      

        
2
Query plan
Run this generated statement in your approved client, then paste the raw JSON result.

        

          

          
        

        
        
Permissions, formats and compatibility
Access denied? Ask about read access to the referenced table, not administrator credentials. A valid plan is required. Copy raw output with TSVRaw; never globally replace JSON escapes.
Canonical collection was checked on local 26.3.31.5, 26.7.6.57 and 26.8.2.7 servers, not ClickHouse Cloud. Missing index detail stays unknown. From 25.9, index reporting can depend on query-condition-cache and skip-index settings. This command does not override your settings. Do not substitute EXPLAIN ANALYZE: it executes the query.

      

      

      

        Optional: name this analysis
        

          
          
        

      

      

        Optional scan estimatesImprove table-read and granule context
        
Run separately and paste JSONEachRow or a JSON array. No rows, access denied, or unsupported engine? Leave blank.

        

          

          
        

        
      

      

        Optional executed plan (ANALYZE)Measured rows and stage wall times · ClickHouse 26.7/26.8
        
Paste an existing approved EXPLAIN ANALYZE … FORMAT TSVRaw capture. ANALYZE executes the query; CH Query does not run it or authorize a new execution. Use the same original SQL, settings and schema as the plan, without compact output.

        
        
        
Matching requires the whole ordered tree and descriptions. Changed or ambiguous trees remain unmapped. Large row counts are rounded; stage wall times overlap and must not be summed. Raw ANALYZE stays in local bundles but is omitted from privacy-protected shares because it can contain sensitive expressions.

      

      

        Optional server & settingsAdd version-aware context
        
Run each statement separately in the same session used for EXPLAIN. Leave unavailable fields blank.

        
Copy server and settings SQL
          
Version: paste the single value below. Unknown versions remain usable without version-relative advice.

          
Deployment: choose Cloud for 1 or self-hosted for 0. No returned row means unknown, not self-hosted.

          
Changed settings: paste the returned JSONEachRow. Keep default values as strings.

          
If your version reports an unknown default column, this fallback omits it. Do not invent defaults.

        

        
        
        
        
Advanced optional evidence
Pipeline and schema are not required. You can keep them in an imported bundle or ask your agent to add them. Pipeline output is text; schema DDL can contain private identifiers, comments or defaults. Review before sharing.
For a table in the plan, use SHOW CREATE TABLE in your SQL client. Quote the database/table identifiers as your client requires. Do not collect row data or credentials.

      

      
Add original SQL and a query plan to continue.

    

  


  
    
Collect runtime manually

    
Optional measurements from one already-authorized completed run. This app does not connect to your database. Do not rerun the query, benchmark, flush logs or change settings.

    

    

    
1. Collect from your SQL client
      
      

      
      
      

      
No matching row? Logs may be delayed, inaccessible or on another node. Cancel and keep metrics unknown; do not broaden the log search. More than one row? Select the intended run in your client, not with LIMIT 1. Query IDs and time windows are never saved in the bundle.

    

    
    
Only read_rows, read_bytes, result_rows, memory_usage (bytes), query_duration_ms (milliseconds). Omit missing fields; actual zeros are measurements. Saving replaces the previous run’s metrics and provenance, rather than mixing runs.

    
    
    
    
    
A top-level log record alone does not establish the scope of every distributed metric. No scope or execution status is assumed.

    
  

  

    

      

        CH Query is an independent EXPLAIN visualizer for ClickHouse.
        Shenandoah · Privacy.
      

      
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