[jira] [Created] (SPARK-27978) Add built-in Aggregate Functions: string_agg

["Yuming Wang (JIRA)" <ji...@apache.org>]

Yuming Wang created SPARK-27978:
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             Summary: Add built-in Aggregate Functions: string_agg
                 Key: SPARK-27978
                 URL: https://issues.apache.org/jira/browse/SPARK-27978
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Yuming Wang


||Function||Argument Type(s)||Return Type||Partial Mode||Description||
|string_agg(_{{expression}}_,_{{delimiter}}_)|({{text}}, {{text}}) or ({{bytea}}, {{bytea}})|same as argument types|No|input values concatenated into a string, separated by delimiter|

https://www.postgresql.org/docs/current/functions-aggregate.html

We can workaround it by concat_ws(_{{delimiter}}_, collect_list(_{{expression}}_)) currently.



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