[jira] [Commented] (CALCITE-3306) Add REGEXP_SPLIT_TO_ARRAY function

["Julian Hyde (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16919077#comment-16919077 ] 

Julian Hyde commented on CALCITE-3306:
--------------------------------------

* Please, no '.' at the end of commit message
* Should not be in {{SqlStdOperatorTable}}, because it is not standard.
* In {{reference.md}}, functions are in alphabetical order
* The function is strict, right? In {{SqlFunctions.regexpSplitToArray}}, don't even check whether {{r}} and {{s}} are null. They will never be.

> Add REGEXP_SPLIT_TO_ARRAY function
> ----------------------------------
>
>                 Key: CALCITE-3306
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3306
>             Project: Calcite
>          Issue Type: New Feature
>            Reporter: Wang Yanlin
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> In work, I need to split a string into array. But I found there is no coresponding *split* function in calcite like the *regexp_split_to_array* in [PostgreSQL|https://www.postgresql.org/docs/9.1/functions-matching.html].
> Although we can solve this by creating a udf based on calcite, but a built in function might be better, in case some others may have the same need.



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