Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18185#discussion_r129944781 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -859,6 +859,22 @@ class Analyzer( // rule: ResolveDeserializer. case plan if containsDeserializer(plan.expressions) => plan + case u @ UnresolvedSubqueryColumnAlias(columnNames, child) if child.resolved => + // Resolves output attributes if a query has alias names in its subquery: + // e.g., SELECT * FROM (SELECT 1 AS a, 1 AS b) t(col1, col2) + val outputAttrs = child.output + // Checks if the number of the aliases equals to the number of output columns + // in the subquery. + if (columnNames.size != outputAttrs.size) { + u.failAnalysis(s"Number of column aliases does not match number of columns. " + --- End diff -- Nit: remove the string Interpolator `s`.
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