HyukjinKwon commented on a change in pull request #28164: [SPARK-31393][SQL]
Show the correct alias in a more elegant way that override the prettyName
URL: https://github.com/apache/spark/pull/28164#discussion_r407828550
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
##########
@@ -43,6 +43,8 @@ case class UnaryMinus(child: Expression) extends
UnaryExpression
override def toString: String = s"-$child"
+ override def prettyName: String = "-"
Review comment:
I think it should be `negative` but should show `-` when it's used as the
sql operator. You should be able to do this with if-else. e.g.)
```
getTagValue(FunctionRegistry.FUNC_ALIAS).getOrElse("-")
```
You might need to override `sql` IIRC.
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