[ 
https://issues.apache.org/jira/browse/SPARK-21774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

StanZhai updated SPARK-21774:
-----------------------------
    Description: 
Data
{code}
create temporary view tb as select * from values
("0", 1),
("-0.1", 2),
("1", 3)
as grouping(a, b)
{code}

SQL:
{code}
select a, b from tb where a=0
{code}

The result which is wrong:
{code}
+----+---+
|   a|  b|
+----+---+
|   0|  1|
|-0.1|  2|
+----+---+
{code}

Logical Plan:
{code}
== Parsed Logical Plan ==
'Project ['a]
+- 'Filter ('a = 0)
   +- 'UnresolvedRelation `src`

== Analyzed Logical Plan ==
a: string
Project [a#8528]
+- Filter (cast(a#8528 as int) = 0)
   +- SubqueryAlias src
      +- Project [_1#8525 AS a#8528, _2#8526 AS b#8529]
         +- LocalRelation [_1#8525, _2#8526]
{code}

  was:
Data
{code}
create temporary view tb as select * from values
("0", 1),
("-0.1", 2),
("1", 3)
as grouping(a, b)
{code}

SQL:
{code}
select a, b from tb where a=0
{code}

The result which is wrong:
{code}
+----+---+
|   a|  b|
+----+---+
|   0|  1|
|-0.1|  2|
+----+---+
{code}


> The rule PromoteStrings cast string to a wrong data type
> --------------------------------------------------------
>
>                 Key: SPARK-21774
>                 URL: https://issues.apache.org/jira/browse/SPARK-21774
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: StanZhai
>            Priority: Critical
>              Labels: correctness
>
> Data
> {code}
> create temporary view tb as select * from values
> ("0", 1),
> ("-0.1", 2),
> ("1", 3)
> as grouping(a, b)
> {code}
> SQL:
> {code}
> select a, b from tb where a=0
> {code}
> The result which is wrong:
> {code}
> +----+---+
> |   a|  b|
> +----+---+
> |   0|  1|
> |-0.1|  2|
> +----+---+
> {code}
> Logical Plan:
> {code}
> == Parsed Logical Plan ==
> 'Project ['a]
> +- 'Filter ('a = 0)
>    +- 'UnresolvedRelation `src`
> == Analyzed Logical Plan ==
> a: string
> Project [a#8528]
> +- Filter (cast(a#8528 as int) = 0)
>    +- SubqueryAlias src
>       +- Project [_1#8525 AS a#8528, _2#8526 AS b#8529]
>          +- LocalRelation [_1#8525, _2#8526]
> {code}



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