[jira] [Commented] (DRILL-4864) Add ANSI format for date/time functions

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-4864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15754233#comment-15754233 ] 

ASF GitHub Bot commented on DRILL-4864:
---------------------------------------

Github user Serhii-Harnyk commented on the issue:

    https://github.com/apache/drill/pull/581
  
    @paul-rogers, I have implemented changes that you have proposed. Could you take a look?


> Add ANSI format for date/time functions
> ---------------------------------------
>
>                 Key: DRILL-4864
>                 URL: https://issues.apache.org/jira/browse/DRILL-4864
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.8.0
>            Reporter: Serhii Harnyk
>            Assignee: Serhii Harnyk
>              Labels: doc-impacting
>             Fix For: Future
>
>
> The TO_DATE() is exposing the Joda string formatting conventions into the SQL layer. This is not following SQL conventions used by ANSI and many other database engines on the market.
> Add new UDFs: 
> * sql_to_date(String, Format), 
> * sql_to_time(String, Format), 
> * sql_to_timestamp(String, Format)
> that requires Postgres datetime format.
> Table of supported Postgres patterns
> ||    Pattern name    ||    Postgres format   
> |    Full name of day    |    day   
> |    Day of year    |    ddd   
> |    Day of month    |    dd    
> |    Day of week    |    d   
> |    Name of month    |    month    
> |    Abr name of month    |    mon    
> |    Full era name    |    ee    
> |    Name of day    |    dy   
> |    Time zone    |    tz   
> |    Hour 12     |    hh   
> |    Hour 12     |    hh12   
> |    Hour 24    |    hh24    
> |    Minute of hour    |    mi  
> |    Second of minute    |    ss   
> |    Millisecond of minute    |    ms    
> |    Week of year    |    ww   
> |    Month    |    mm   
> |    Halfday am    |    am    
> |    Year   |   y   
> |    ref.    |    https://www.postgresql.org/docs/8.2/static/functions-formatting.html   |
> Table of acceptable Postgres pattern modifiers, which may be used in Format string
> ||    Description    ||    Pattern    ||
> |    fill mode (suppress padding blanks and zeroes)    |    fm     |
> |    fixed format global option (see usage notes)    |    fx     |
> |    translation mode (print localized day and month names based on lc_messages)    |    tm     |
> |    spell mode (not yet implemented)    |    sp    |
> |    ref.    |    https://www.postgresql.org/docs/8.2/static/functions-formatting.html    |



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