[jira] [Commented] (DRILL-4607) Add a split function that allows to separate string by a delimiter

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

    [ https://issues.apache.org/jira/browse/DRILL-4607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287543#comment-15287543 ] 

ASF GitHub Bot commented on DRILL-4607:
---------------------------------------

Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/481#discussion_r63602468
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/StringFunctions.java ---
    @@ -1280,6 +1280,43 @@ public void eval() {
         } // end of eval
       }
     
    +  @FunctionTemplate(name = "split", scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
    +  public static class Split implements DrillSimpleFunc {
    +    @Param  VarCharHolder input;
    +    @Param  VarCharHolder delimiter;
    +
    +    @Workspace char splitChar;
    --- End diff --
    
    How about reusing the Splitter?
    
    Create a workspace splitter once in setup, and use in eval.


> Add a split function that allows to separate string by a delimiter
> ------------------------------------------------------------------
>
>                 Key: DRILL-4607
>                 URL: https://issues.apache.org/jira/browse/DRILL-4607
>             Project: Apache Drill
>          Issue Type: New Feature
>          Components: Functions - Drill
>    Affects Versions: 1.6.0
>            Reporter: Alicia Alvarez
>
> Ex: Let's say I have records in a CSV file with the following schema
> {noformat}
> user_name, friend_list_separated_by_a_delimiter,other_fields
> ali,sam;adi;tom,45,...
> {noformat}
> I want to run a query which returns the friend list files as a repeated value.
> {noformat}
> select user_name, split(friend_list, ';') friends from userdata;
> {noformat}
> This should return the records in the following format
> {noformat}
> ---------------------------------
> | user_name |       friends     |
> ---------------------------------
> |   ali     |  [sam, adi, tom]  |
> ---------------------------------
> {noformat}



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