[jira] [Updated] (TAJO-684) Add functions about time

["Jihoon Son (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAJO-684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jihoon Son updated TAJO-684:
----------------------------

    Description: 
Functions about time such as utc_usec_to_second(), utc_usec_to_minute(), utc_usec_to_hour(), utc_usec_to_day(), utc_usec_to_week(), utc_usec_to_year() are popularly used in many applications.
These functions are useful when we group data with tome intervals. 
For example, utc_usec_to_day() works as follows. 
{noformat}
tajo> select utc_usec_to_day(1274);
We need to provide these functions by default.

  was:
Functions about time such as to_second(), to_minute(), to_hour(), to_day(), to_week(), to_year() are popularly used in many applications.
We need to provide these functions by default.


> Add functions about time
> ------------------------
>
>                 Key: TAJO-684
>                 URL: https://issues.apache.org/jira/browse/TAJO-684
>             Project: Tajo
>          Issue Type: Task
>          Components: function/udf
>    Affects Versions: 1.0-incubating
>            Reporter: Jihoon Son
>
> Functions about time such as utc_usec_to_second(), utc_usec_to_minute(), utc_usec_to_hour(), utc_usec_to_day(), utc_usec_to_week(), utc_usec_to_year() are popularly used in many applications.
> These functions are useful when we group data with tome intervals. 
> For example, utc_usec_to_day() works as follows. 
> {noformat}
> tajo> select utc_usec_to_day(1274);
> We need to provide these functions by default.



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