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https://issues.apache.org/jira/browse/SPARK-29274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16939865#comment-16939865
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Yuming Wang commented on SPARK-29274:
-------------------------------------
Oracle will cast varchar type to number type:
{noformat}
create table t1 (incdata_id number(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');
SQL> select * from t1 join t2 on (t1.incdata_id = t2.incdata_id);
no rows selected
SQL> explain plan for select * from t1 join t2 on (t1.incdata_id =
t2.incdata_id);
Explained.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 1838229974
---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 144 | 4 (0)| 00:00:01 |
|* 1 | HASH JOIN | | 1 | 144 | 4 (0)| 00:00:01 |
| 2 | TABLE ACCESS FULL| T1 | 1 | 25 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL| T2 | 1 | 119 | 2 (0)| 00:00:01 |
---------------------------------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("T1"."INCDATA_ID"=TO_NUMBER("T2"."INCDATA_ID"))
Note
-----
- dynamic statistics used: dynamic sampling (level=2)
19 rows selected.
{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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