suibianwanwank commented on issue #15032:
URL: https://github.com/apache/datafusion/issues/15032#issuecomment-2771512245
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
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