Hyukjin Kwon created SPARK-31036:
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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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