Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/4068#discussion_r23665510 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -285,11 +285,22 @@ class Analyzer(catalog: Catalog, result // Resolve field names using the resolver. - case f @ GetField(child, fieldName) if !f.resolved && child.resolved => + case f @ GetField(child, fieldName) if child.resolved => child.dataType match { case StructType(fields) => - val resolvedFieldName = fields.map(_.name).find(resolver(_, fieldName)) - resolvedFieldName.map(n => f.copy(fieldName = n)).getOrElse(f) + val actualField = fields.filter(f => resolver(f.name, fieldName)) + if (actualField.length == 0) { + sys.error( + s"No such struct field $fieldName in ${fields.map(_.name).mkString(", ")}") --- End diff -- I think `CheckResolution` should catch it. If we cannot resolve it, just leave it unchanged. Can you see if there is a unit test for this? If not, can you add one? Maybe we can also log it like what `LogicalPlan.resolve` does.
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