Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21745#discussion_r202055806 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -1165,15 +1173,19 @@ class Analyzer( (newExprs, AnalysisBarrier(newChild)) case p: Project => + // Resolving expressions against current plan. val maybeResolvedExprs = exprs.map(resolveExpression(_, p)) + // Recursively resolving expressions on the child of current plan. val (newExprs, newChild) = resolveExprsAndAddMissingAttrs(maybeResolvedExprs, p.child) - val missingAttrs = AttributeSet(newExprs) -- AttributeSet(maybeResolvedExprs) + // If some attributes used by expressions are resolvable only on the rewritten child + // plan, we need to add them into original projection. + val missingAttrs = (AttributeSet(newExprs) -- p.outputSet).intersect(newChild.outputSet) --- End diff -- what if we do not do the `.intersect(newChild.outputSet)`?
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