[GitHub] [spark] cloud-fan commented on a diff in pull request #42797: [SPARK-45068][SQL] Make function output column name consistent in case

["cloud-fan (via GitHub)" <gi...@apache.org>]

cloud-fan commented on code in PR #42797:
URL: https://github.com/apache/spark/pull/42797#discussion_r1315476814


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala:
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@@ -67,7 +67,8 @@ abstract class UnaryMathExpression(val f: Double => Double, name: String)
   override def dataType: DataType = DoubleType
   override def nullable: Boolean = true
   override def toString: String = s"$prettyName($child)"
-  override def prettyName: String = getTagValue(FunctionRegistry.FUNC_ALIAS).getOrElse(name)
+  override def prettyName: String = getTagValue(FunctionRegistry.FUNC_ALIAS).
+    getOrElse(name.toLowerCase(Locale.ROOT))

Review Comment:
   is this the only place that need to change? `LeafMathExpression` does not lower-case the name either.



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