cloud-fan commented on code in PR #52449:
URL: https://github.com/apache/spark/pull/52449#discussion_r2378107175
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TableOutputResolver.scala:
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@@ -222,12 +223,29 @@ object TableOutputResolver extends SQLConfHelper with
Logging {
val requiredMetadata = CharVarcharUtils.cleanMetadata(column.metadata)
// Make sure that the result has the requiredMetadata and only that.
- // If the expr is an Attribute or NamedLambdaVariable with the proper name
and metadata,
- // it should remain stable, but we do not trust that other NamedAttributes
will
- // remain stable (namely Alias).
+ //
+ // If the expr NamedLambdaVariable, it must be from our handling of
structured
Review Comment:
```suggestion
// If the expr is NamedLambdaVariable, it must be from our handling of
structured
```
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