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https://issues.apache.org/jira/browse/SPARK-51456?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk updated SPARK-51456:
-----------------------------
    Description: 
The new function *to_time()* should return expr cast to a timestamp using an 
optional formatting.

h4. Syntax

{code:sql}
to_time(expr [, fmt] )
{code}

h4. Arguments
* expr: A STRING expression representing a time.
* fmt: An optional format STRING expression.
h4. Returns
h4. A TIME\(n\). If n where n is derived from fmt.

If fmt is supplied, it must conform with Datetime patterns.

If fmt is not supplied, the function is a synonym for cast(expr AS TIME).

If fmt is malformed or its application does not result in a well formed time, 
the function raises an error.

To return NULL instead of an error in case of a malformed expr use try_to_time.
h4. Examples

{code:sql}
> SELECT to_time('00:12:00');
 00:12:00

> SELECT to_time('12.10.05', 'hh.mm.ss');
 12:10:05
{code}



  was:
The new function *to_time()* should return expr cast to a timestamp using an 
optional formatting.

h4. Syntax

{code:sql}
to_time(expr [, fmt] )
{code}

h4. Arguments
* expr: A STRING expression representing a time.
* fmt: An optional format STRING expression.
h4. Returns
h4. A TIME(n). If n where n is derived from fmt.

If fmt is supplied, it must conform with Datetime patterns.

If fmt is not supplied, the function is a synonym for cast(expr AS TIME).

If fmt is malformed or its application does not result in a well formed time, 
the function raises an error.

To return NULL instead of an error in case of a malformed expr use try_to_time.
h4. Examples

{code:sql}
> SELECT to_time('00:12:00');
 00:12:00

> SELECT to_time('12.10.05', 'hh.mm.ss');
 12:10:05
{code}




> Add the to_time() function
> --------------------------
>
>                 Key: SPARK-51456
>                 URL: https://issues.apache.org/jira/browse/SPARK-51456
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 4.1.0
>            Reporter: Max Gekk
>            Priority: Major
>
> The new function *to_time()* should return expr cast to a timestamp using an 
> optional formatting.
> h4. Syntax
> {code:sql}
> to_time(expr [, fmt] )
> {code}
> h4. Arguments
> * expr: A STRING expression representing a time.
> * fmt: An optional format STRING expression.
> h4. Returns
> h4. A TIME\(n\). If n where n is derived from fmt.
> If fmt is supplied, it must conform with Datetime patterns.
> If fmt is not supplied, the function is a synonym for cast(expr AS TIME).
> If fmt is malformed or its application does not result in a well formed time, 
> the function raises an error.
> To return NULL instead of an error in case of a malformed expr use 
> try_to_time.
> h4. Examples
> {code:sql}
> > SELECT to_time('00:12:00');
>  00:12:00
> > SELECT to_time('12.10.05', 'hh.mm.ss');
>  12:10:05
> {code}



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