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https://issues.apache.org/jira/browse/SPARK-30147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takeshi Yamamuro resolved SPARK-30147.
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Fix Version/s: 3.0.0
Assignee: Kent Yao
Resolution: Fixed
Resolved by https://github.com/apache/spark/pull/26776
> Trim the string when cast string type to booleans
> -------------------------------------------------
>
> Key: SPARK-30147
> URL: https://issues.apache.org/jira/browse/SPARK-30147
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Kent Yao
> Assignee: Kent Yao
> Priority: Major
> Fix For: 3.0.0
>
>
> Now, we trim the string when casting string value to those `canCast` types
> values, e.g. int, double, decimal, interval, date, timestamps, except for
> boolean.
> This behavior makes type cast and coercion inconsistency in Spark.
> Not fit ANSI SQL standard either.
> {code:java}
> If TD is boolean, then
> Case:
> a) If SD is character string, then SV is replaced by
> TRIM ( BOTH ' ' FROM VE )
> Case:
> i) If the rules for literal in Subclause 5.3, “literal”, can be applied
> to SV to determine a valid
> value of the data type TD, then let TV be that value.
> ii) Otherwise, an exception condition is raised: data exception — invalid
> character value for cast.
> b) If SD is boolean, then TV is SV
> {code}
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