linhongliu-db commented on a change in pull request #32832:
URL: https://github.com/apache/spark/pull/32832#discussion_r658436593
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -432,10 +432,26 @@ class Analyzer(override val catalogManager:
CatalogManager)
case e if !e.resolved => u
case g: Generator => MultiAlias(g, Nil)
case c @ Cast(ne: NamedExpression, _, _, _) => Alias(c, ne.name)()
- case e: ExtractValue => Alias(e, toPrettySQL(e))()
+ case e: ExtractValue =>
+ val onlyExtract = e.collect {
+ case _: ExtractValue => true
+ case _ => false
+ }.forall(a => a)
+ if (onlyExtract) {
+ Alias(e, toPrettySQL(e))()
+ } else {
+ val meta = new MetadataBuilder()
+ .putString("autoGeneratedAlias", "true")
Review comment:
could we change this to something like `__unstableAlias`? because for
example, the alias for `extractOnly` is also auto-generated.
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