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Posted to issues@drill.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/11/08 22:13:00 UTC
[jira] [Commented] (DRILL-8354) Add IS_EMPTY Function.

    [ https://issues.apache.org/jira/browse/DRILL-8354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17630639#comment-17630639 ] 

ASF GitHub Bot commented on DRILL-8354:
---------------------------------------

cgivre opened a new pull request, #2703:
URL: https://github.com/apache/drill/pull/2703

   # [DRILL-8354](https://issues.apache.org/jira/browse/DRILL-8354): Add IS_EMPTY Function
   
   ## Description
   When analyzing data, there is currently no single function to evaluate whether a given field is empty.  With scalar fields, this can be accomplished with the `IS NOT NULL` operator, but with complex fields, this is more challenging as complex fields are never null. 
   This PR adds a UDF called `IS_EMPTY()` which accepts any type of field and returns true if the field does not contain data.  
   
   In the case of scalar fields, if the field is `null` this returns true.  In the case of complex fields, which can never be `null`, in the case of lists, the function returns true if the list is empty.  In the case of maps, it returns true if all of the map's fields are unpopulated. 
   
   ## Documentation
   See above.
   
   ## Testing
   Added unit tests.




> Add IS_EMPTY Function.
> ----------------------
>
>                 Key: DRILL-8354
>                 URL: https://issues.apache.org/jira/browse/DRILL-8354
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Functions - Drill
>    Affects Versions: 1.20.2
>            Reporter: Charles Givre
>            Assignee: Charles Givre
>            Priority: Major
>             Fix For: 2.0.0
>
>
> When analyzing data, there is currently no single function to evaluate whether a given field is empty.  With scalar fields, this can be accomplished with the `IS NOT NULL` operator, but with complex fields, this is more challenging as complex fields are never null. 
> This PR adds a UDF called IS_EMPTY() which accepts any type of field and returns true if the field does not contain data.  
>  
> In the case of scalar fields, if the field is `null` this returns true.  In the case of complex fields, which can never be `null`, in the case of lists, the function returns true if the list is empty.  In the case of maps, it returns true if all of the map's fields are unpopulated. 



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