HyukjinKwon commented on a change in pull request #27788: [SPARK-31036][SQL]
Use stringArgs in Expression.toString to respect hidden parameters
URL: https://github.com/apache/spark/pull/27788#discussion_r388202220
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/higherOrderFunctions.scala
##########
@@ -533,6 +533,8 @@ case class ArrayExists(
SQLConf.get.getConf(SQLConf.LEGACY_ARRAY_EXISTS_FOLLOWS_THREE_VALUED_LOGIC))
}
+ override def stringArgs: Iterator[Any] = super.stringArgs.take(2)
+
Review comment:
This is actually a followup of https://github.com/apache/spark/pull/27655. I
am not going to add a test case because we don't guarantee on the naming
against `NonSQLExpression` yet. It is just to make it prettier.
I manually tested as below:
```scala
val identify = udf((input: Boolean) => input)
spark.range(10).select(identify(exists(array(col("id")), _ % 2 ===
0))).show()
```
Before:
```
+-------------------------------------------------------------------------------------+
|UDF(exists(array(id), lambdafunction(((lambda 'x % 2) = 0), lambda 'x,
false), true))|
+-------------------------------------------------------------------------------------+
|
true|
|
false|
|
true|
...
```
After:
```
+-------------------------------------------------------------------------------+
|UDF(exists(array(id), lambdafunction(((lambda 'x % 2) = 0), lambda 'x,
false)))|
+-------------------------------------------------------------------------------+
|
true|
|
false|
|
true|
```
Here, now we hide properly `followThreeValuedLogic` in `ArrayExists`.
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