cloud-fan commented on a change in pull request #31012:
URL: https://github.com/apache/spark/pull/31012#discussion_r564588100
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -418,7 +418,7 @@ object RemoveRedundantAliases extends Rule[LogicalPlan] {
// If the alias name is different from attribute name, we can't strip it
either, or we
// may accidentally change the output schema name of the root plan.
case a @ Alias(attr: Attribute, name)
- if a.metadata == Metadata.empty &&
+ if (a.metadata == Metadata.empty || a.metadata == attr.metadata) &&
Review comment:
This is the only non-testing change in this PR, but it's very minor and
obvious.
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