Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21745#discussion_r201901412
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1163,7 +1165,8 @@ class Analyzer(
case p: Project =>
val maybeResolvedExprs = exprs.map(resolveExpression(_, p))
val (newExprs, newChild) =
resolveExprsAndAddMissingAttrs(maybeResolvedExprs, p.child)
- val missingAttrs = AttributeSet(newExprs) --
AttributeSet(maybeResolvedExprs)
+ // The resolved attributes might not come from `p.child`. Need
to filter it.
--- End diff --
how can this happen? if the resolved attributes do not exist in child, then
the plan is invalid, isn't it?
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