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https://issues.apache.org/jira/browse/SPARK-21774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177461#comment-17177461
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ZhouDaHong commented on SPARK-21774:
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Hello, you compare the value of a field of string type with the 0 in your sql.
Due to the different data types, (the 0 may be judged as boolean type, or 0 as
int type).
Therefore, the SQL statement [ select a, B from TB where a = 0 ] cannot get the
result you expect.
It is suggested to change to [ select a, B from TB where a ='0' ]
> 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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