[
https://issues.apache.org/jira/browse/SPARK-25098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
ice bai updated SPARK-25098:
----------------------------
Description:
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('2018-04-27 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
```
was:
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
select hour('2018-04-27 17:20:07
```
spark-sql:
```
spark-sql> SELECT CAST(' 2018-08-13' AS DATE);//starts with a blank
NULL
```
> ‘Cast’ will return NULL when input string starts/ends with special character
> -----------------------------------------------------------------------------
>
> 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
> 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('2018-04-27 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
> ```
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