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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