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https://issues.apache.org/jira/browse/SPARK-25098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-25098:
------------------------------------
Assignee: Apache Spark
> ‘Cast’ will return NULL when input string starts/ends with special
> character(s)
> -------------------------------------------------------------------------------
>
> Key: SPARK-25098
> URL: https://issues.apache.org/jira/browse/SPARK-25098
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: ice bai
> Assignee: Apache Spark
> Priority: Major
>
> UDF ‘Cast’ will return NULL when input string starts/ends with special
> character, but hive doesn't.
> For examle, we get hour from a string ends with a blank :
> hive：
> ```
> hive> SELECT CAST(' 2018-08-13' AS DATE);//starts with a blank
> OK
> 2018-08-13
> hive> SELECT HOUR('2018-08-13 17:20:07 );//ends with a blank
> OK
> 17
> ```
> spark-sql:
> ```
> spark-sql> SELECT CAST(' 2018-08-13' AS DATE);//starts with a blank
> NULL
> spark-sql> SELECT HOUR('2018-08-13 17:20:07 );//ends with a blank
> NULL
> ```
> All of the following UDFs will be affected:
> ```
> year
> month
> day
> hour
> minute
> second
> date_add
> date_sub
> ```
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