amanomer commented on a change in pull request #26712: [SPARK-29883][SQL]
Improve error messages when function name is an alias
URL: https://github.com/apache/spark/pull/26712#discussion_r352431228
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
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@@ -286,6 +286,15 @@ abstract class Expression extends TreeNode[Expression] {
override def simpleStringWithNodeId(): String = {
throw new UnsupportedOperationException(s"$nodeName does not implement
simpleStringWithNodeId")
}
+
+ var functionAlias: String = ""
Review comment:
Argument's data types are matched in Analysis phase of planning and its
optimizer's task to replace `RuntimeReplaceable`, correct me if I'm wrong.
So, optimization rules (`ReplaceExpressions`) will never be applied on
queries like `select every('true')`.
https://github.com/apache/spark/blob/85cb388ae3f25b0e6a7fc1a2d78fd1c3ec03f341/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L130
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