Similar to the "count-bug" case that produces incorrect results #15032

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1. suibianwanwank

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   bugSomething isn't workingSomething isn't working

   on Mar 5, 2025
2. suibianwanwank commented on Mar 5, 2025

   

   suibianwanwank

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   suibianwanwank

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4. suibianwanwank commented on Apr 2, 2025

   

   suibianwanwank

   on Apr 2, 2025

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   Additionally, I tried this query in several other databases—here are some execution plans.
   SQL server execution plan:

   |--Compute Scalar(DEFINE:([Expr1006]=CASE WHEN [Expr1004]=(1) THEN 'A' ELSE 'B' END))
   	|--Hash Match(Right Outer Join, HASH:([B].[b])=([A].[b]), RESIDUAL:([test].[test].[B].[b] as [A].[b]=[test].[test].[B].[b] as [B].[b]))
   		|--Stream Aggregate(GROUP BY:([B].[b]) DEFINE:([Expr1004]=MAX([test].[test].[B].[a] as [B].[a])))
   		|	|--Sort(ORDER BY:([B].[b] ASC))
                   |   	|--Table Scan(OBJECT:([test].[test].[B] AS [B]))
   		|--Table Scan(OBJECT:([test].[test].[B] AS [A]))
   

   Presto execution plan:

   Presto Plan:
   - Output[PlanNodeId 50][b, _col1] => [field_0:integer, expr_35:varchar(1)]
           Estimates: {source: CostBasedSourceInfo, rows: 3 (180B), cpu: 558.00, memory: 91.00, network: 0.00}
           b := field_0 (9:5)
           _col1 := expr_35 (10:5)
       - Project[PlanNodeId 406][projectLocality = LOCAL] => [field_0:integer, expr_35:varchar(1)]
               Estimates: {source: CostBasedSourceInfo, rows: 3 (180B), cpu: 558.00, memory: 91.00, network: 0.00}
               expr_35 := SWITCH(BOOLEAN'true', WHEN((max) > (INTEGER'10'), VARCHAR'a'), VARCHAR'b') (12:22)
           - Aggregate(STREAMING)[field_0, unique][PlanNodeId 405] => [field_0:integer, unique:bigint, max:integer]
                   Estimates: {source: CostBasedSourceInfo, rows: 3 (180B), cpu: 378.00, memory: 91.00, network: 0.00}
                   max := "presto.default.max"((field_16)) (11:22)
               - LeftJoin[PlanNodeId 404][("add" = "field_17")][$hashvalue, $hashvalue_47] => [field_0:integer, unique:bigint, field_16:integer]
                       Estimates: {source: CostBasedSourceInfo, rows: 3 (180B), cpu: 329.00, memory: 34.00, network: 0.00}
                       Distribution: REPLICATED
                   - Project[PlanNodeId 816][projectLocality = LOCAL] => [field_0:integer, unique:bigint, add:integer, $hashvalue:bigint]
                           Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 122.00, memory: 0.00, network: 0.00}
                           $hashvalue := combine_hash(BIGINT'0', COALESCE($operator$hash_code(add), BIGINT'0')) (2:6)
                       - Project[PlanNodeId 489][projectLocality = LOCAL] => [field_0:integer, unique:bigint, add:integer]
                               Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 66.00, memory: 0.00, network: 0.00}
                               add := (field_0) + (INTEGER'1') (2:6)
                           - AssignUniqueId[PlanNodeId 403] => [field_0:integer, unique:bigint]
                                   Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 28.00, memory: 0.00, network: 0.00}
                               - LocalExchange[PlanNodeId 778][ROUND_ROBIN] () => [field_0:integer]
                                       Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 10.00, memory: 0.00, network: 0.00}
                                   - Values[PlanNodeId 0] => [field_0:integer]
                                           Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 0.00, memory: 0.00, network: 0.00}
                                           (INTEGER'2')
                                           (INTEGER'0')
                   - LocalExchange[PlanNodeId 779][HASH][$hashvalue_47] (field_17) => [field_16:integer, field_17:integer, $hashvalue_47:bigint]
                           Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 68.00, memory: 0.00, network: 0.00}
                       - Project[PlanNodeId 817][projectLocality = LOCAL] => [field_16:integer, field_17:integer, $hashvalue_48:bigint]
                               Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 34.00, memory: 0.00, network: 0.00}
                               $hashvalue_48 := combine_hash(BIGINT'0', COALESCE($operator$hash_code(field_17), BIGINT'0')) (3:9)
                           - Values[PlanNodeId 28] => [field_16:integer, field_17:integer]
                                   Estimates: {source: CostBasedSourceInfo, rows: 2 (120B), cpu: 0.00, memory: 0.00, network: 0.00}
                                   (INTEGER'1', INTEGER'2')
                                   (null, INTEGER'0')
   

   BTW, I ran this query in DuckDB and found that DuckDB also has this issue.
   FYI, @xudong963 @jayzhan211
5. jayzhan211 commented on Apr 2, 2025

   

   jayzhan211

   on Apr 2, 2025 · Hidden as outdated

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6. jayzhan211

   closed this as completedin #15281on Apr 4, 2025