[jira] [Created] (SPARK-31036) Use stringArgs in Expression.toString to respect hidden parameters

["Hyukjin Kwon (Jira)" <ji...@apache.org>]

Hyukjin Kwon created SPARK-31036:
------------------------------------

             Summary: Use stringArgs in Expression.toString to respect hidden parameters
                 Key: SPARK-31036
                 URL: https://issues.apache.org/jira/browse/SPARK-31036
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Hyukjin Kwon


Currently, the top of https://github.com/apache/spark/pull/27657, 

{code}
val identify = udf((input: Seq[Int]) => input)
spark.range(10).select(identify(array("id"))).show()
{code}

shows hidden parameter `useStringTypeWhenEmpty`.

{code}
+---------------------+
|UDF(array(id, false))|
+---------------------+
|                  [0]|
|                  [1]|
...
{code}

This is a general problem and we should respect hidden parameters.



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