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https://issues.apache.org/jira/browse/SPARK-29274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16939862#comment-16939862
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Yuming Wang commented on SPARK-29274:
-------------------------------------
SQL server will cast string type to decimal type:
{noformat}
create table t1 (incdata_id decimal(21,0), v VARCHAR(21))
create table t2 (incdata_id VARCHAR(210), v VARCHAR(21))
insert into t1 values(100000000001636981212, '1')
insert into t2 values(100000000001636981213, '2')
1> explain select * from t1 join t2 on (t1.incdata_id = t2.incdata_id)
2> go
StmtText
StmtId NodeId
Parent PhysicalOp LogicalOp
Argument
DefinedValues
EstimateRows EstimateIO EstimateCPU
AvgRowSize TotalSubtreeCost OutputList
Warnings
Type Parallel
EstimateExecutions
------------------------------------------------------------------------------------------------------------------------------------------
----------- ----------- ----------- ------------------------------
------------------------------
-------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------
-------------- -------------- -------------- ----------- ----------------
---------------------------------------------------------------------------------------------------------------------
-------- ----------------------------------------------------------------
-------- ------------------
select * from t1 join t2 on (t1.incdata_id = t2.incdata_id);
1
1 0 NULL NULL 1
NULL
1.0 NULL NULL
NULL 2.4348916E-2 NULL
NULL SELECT
0
NULL
|--Hash Match(Inner Join,
HASH:([master].[dbo].[t1].[incdata_id])=([Expr1006]),
RESIDUAL:([master].[dbo].[t1].[incdata_id]=[Expr1006])) 1
2 1 Hash Match Inner Join
HASH:([master].[dbo].[t1].[incdata_id])=([Expr1006]),
RESIDUAL:([master].[dbo].[t1].[incdata_id]=[Expr1006]) NULL
1.0
0.0 1.7779617E-2 59 2.4348916E-2
[master].[dbo].[t1].[incdata_id], [master].[dbo].[t1].[v],
[master].[dbo].[t2].[incdata_id], [master].[dbo].[t2].[v] NULL PLAN_ROW
0 1.0
|--Table Scan(OBJECT:([master].[dbo].[t1]))
1
3 2 Table Scan Table Scan
OBJECT:([master].[dbo].[t1])
[master].[dbo].[t1].[incdata_id],
[master].[dbo].[t1].[v] 1.0 0.003125
0.0001581 24 0.0032831 [master].[dbo].[t1].[incdata_id],
[master].[dbo].[t1].[v]
NULL PLAN_ROW
0 1.0
|--Compute
Scalar(DEFINE:([Expr1006]=CONVERT_IMPLICIT(decimal(21,0),[master].[dbo].[t2].[incdata_id],0)))
1 4 2 Compute Scalar
Compute Scalar
DEFINE:([Expr1006]=CONVERT_IMPLICIT(decimal(21,0),[master].[dbo].[t2].[incdata_id],0))
[Expr1006]=CONVERT_IMPLICIT(decimal(21,0),[master].[dbo].[t2].[incdata_id],0)
1.0 0.0 0.0000001 57 3.2832001E-3
[master].[dbo].[t2].[incdata_id], [master].[dbo].[t2].[v], [Expr1006]
NULL PLAN_ROW
0 1.0
|--Table Scan(OBJECT:([master].[dbo].[t2]))
1
5 4 Table Scan Table Scan
OBJECT:([master].[dbo].[t2])
[master].[dbo].[t2].[incdata_id],
[master].[dbo].[t2].[v] 1.0 0.003125
0.0001581 44 0.0032831 [master].[dbo].[t2].[incdata_id],
[master].[dbo].[t2].[v]
NULL PLAN_ROW
0 1.0
(5 rows affected)
1> select * from t1 join t2 on (t1.incdata_id = t2.incdata_id)
2> go
incdata_id v incdata_id v
----------------------- - --------------------- ---------------------
(0 rows affected)
{noformat}
> Can not coerce decimal type to double type when it's join key
> -------------------------------------------------------------
>
> Key: SPARK-29274
> URL: https://issues.apache.org/jira/browse/SPARK-29274
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.4, 2.4.4, 3.0.0
> Reporter: Yuming Wang
> Assignee: Pengfei Chang
> Priority: Major
> Attachments: image-2019-09-27-20-20-24-238.png
>
>
> How to reproduce this issue:
> {code:sql}
> create table t1 (incdata_id decimal(21,0), v string) using parquet;
> create table t2 (incdata_id string, v string) using parquet;
> explain select * from t1 join t2 on (t1.incdata_id = t2.incdata_id);
> == Physical Plan ==
> *(5) SortMergeJoin
> [knownfloatingpointnormalized(normalizenanandzero(cast(incdata_id#31 as
> double)))],
> [knownfloatingpointnormalized(normalizenanandzero(cast(incdata_id#33 as
> double)))], Inner
> :- *(2) Sort
> [knownfloatingpointnormalized(normalizenanandzero(cast(incdata_id#31 as
> double))) ASC NULLS FIRST], false, 0
> : +- Exchange
> hashpartitioning(knownfloatingpointnormalized(normalizenanandzero(cast(incdata_id#31
> as double))), 200), true, [id=#104]
> : +- *(1) Filter isnotnull(incdata_id#31)
> : +- Scan hive default.t1 [incdata_id#31, v#32], HiveTableRelation
> `default`.`t1`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe,
> [incdata_id#31, v#32], Statistics(sizeInBytes=8.0 EiB)
> +- *(4) Sort
> [knownfloatingpointnormalized(normalizenanandzero(cast(incdata_id#33 as
> double))) ASC NULLS FIRST], false, 0
> +- Exchange
> hashpartitioning(knownfloatingpointnormalized(normalizenanandzero(cast(incdata_id#33
> as double))), 200), true, [id=#112]
> +- *(3) Filter isnotnull(incdata_id#33)
> +- Scan hive default.t2 [incdata_id#33, v#34], HiveTableRelation
> `default`.`t2`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe,
> [incdata_id#33, v#34], Statistics(sizeInBytes=8.0 EiB)
> {code}
> {code:sql}
> select cast(v1 as double) as v3, cast(v2 as double) as v4,
> cast(v1 as double) = cast(v2 as double), v1 = v2
> from (select cast('100000000001636981212' as decimal(21, 0)) as v1,
> cast('100000000001636981213' as decimal(21, 0)) as v2) t;
> 1.0000000000163697E20 1.0000000000163697E20 true false
> {code}
>
> It's a realy case in our production:
> !image-2019-09-27-20-20-24-238.png|width=100%!
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