Xiao Li created SPARK-23916:
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             Summary: array_join(x, delimiter, null_replacement) → varchar
                 Key: SPARK-23916
                 URL: https://issues.apache.org/jira/browse/SPARK-23916
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Xiao Li


Ref: https://prestodb.io/docs/current/functions/array.html

Concatenates the elements of the given array using the delimiter and an 
optional string to replace nulls.



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