mikhailnik-db commented on code in PR #48748:
URL: https://github.com/apache/spark/pull/48748#discussion_r1840551066


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala:
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@@ -2216,21 +2216,25 @@ class Analyzer(override val catalogManager: 
CatalogManager) extends RuleExecutor
         numArgs: Int,
         u: UnresolvedFunction): Expression = {
       func match {
-        case owg: SupportsOrderingWithinGroup if u.isDistinct =>
+        case owg: InverseDistributionFunction if u.isDistinct =>
           throw 
QueryCompilationErrors.distinctInverseDistributionFunctionUnsupportedError(
             owg.prettyName)
-        case owg: SupportsOrderingWithinGroup
+        case owg: InverseDistributionFunction
           if !owg.orderingFilled && u.orderingWithinGroup.isEmpty =>

Review Comment:
   I made it this way because all exceptions here have the 
`INVALID_INVERSE_DISTRIBUTION_FUNCTION` prefix. I decided it's easier to 
decouple functions support `WITHIN GROUP (ORDER BY)` from the inverse 
distribution functions than to generalize the error classes.



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