[jira] [Created] (SPARK-25252) Support arrays of any types in to_json

["Maxim Gekk (JIRA)" <ji...@apache.org>]

Maxim Gekk created SPARK-25252:
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             Summary: Support arrays of any types in to_json
                 Key: SPARK-25252
                 URL: https://issues.apache.org/jira/browse/SPARK-25252
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.3.1
            Reporter: Maxim Gekk


Need to improve the to_json function and make it more consistent with from_json by supporting arrays of any types (as root types). For now, it supports only arrays of structs and arrays of maps.  After the changes the following code should work:
{code:scala}
select to_json(array('1','2','3'))
> ["1","2","3"]
select to_json(array(array(1,2,3),array(4)))
> [[1,2,3],[4]]
{code}



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