[jira] [Updated] (SPARK-25098) Trim the string when cast stringToTimestamp and stringToDate

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun updated SPARK-25098:
----------------------------------
    Summary: Trim the string when cast stringToTimestamp and stringToDate  (was: ‘Cast’ will return NULL when input string starts/ends with special character(s))

> Trim the string when cast stringToTimestamp and stringToDate
> ------------------------------------------------------------
>
>                 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: Yuming Wang
>            Priority: Major
>             Fix For: 3.0.0
>
>
> 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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