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https://issues.apache.org/jira/browse/SPARK-21774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16631568#comment-16631568
]
ice bai commented on SPARK-21774:
---------------------------------
I met the same problem in Spark 2.3.0. The flowlling is some tests
```
spark-sql> select '11111111'>0;
true
Time taken: 0.078 seconds, Fetched 1 row(s)
spark-sql> select '111111111111'>0;
NULL
Time taken: 0.065 seconds, Fetched 1 row(s)
spark-sql> select '1.0'=1;
true
Time taken: 0.054 seconds, Fetched 1 row(s)
spark-sql> select '1.2'=1;
true
Time taken: 0.07 seconds, Fetched 1 row(s)
```
When set log level to trace, I found this:
=== Applying Rule
org.apache.spark.sql.catalyst.analysis.TypeCoercion$PromoteStrings ===
!'Project [unresolvedalias((111111111111> 0), None)] 'Project
[unresolvedalias((cast(111111111111 as int) > 0), None)]
+- OneRowRelation +- OneRowRelation
> 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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