Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18079#discussion_r118833872
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -592,7 +592,23 @@ class Analyzer(
def resolveRelation(plan: LogicalPlan): LogicalPlan = plan match {
case u: UnresolvedRelation if
!isRunningDirectlyOnFiles(u.tableIdentifier) =>
val defaultDatabase = AnalysisContext.get.defaultDatabase
- val relation = lookupTableFromCatalog(u, defaultDatabase)
+ val foundRelation = lookupTableFromCatalog(u, defaultDatabase)
+
+ // If alias names assigned, add `Project` with the aliases
+ val relation = if (u.outputNames.nonEmpty) {
+ val outputAttrs = foundRelation.output
+ // Checks if the number of the aliases is equal to expected one
+ if (u.outputNames.size != outputAttrs.size) {
+ u.failAnalysis(s"expected ${outputAttrs.size} columns but
found " +
+ s"${u.outputNames.size} columns in alias names")
--- End diff --
>The number of column aliases does not match the number of column of the
table `$tableName`. Number of column aliases: ${u.outputNames.size}; Number of
columns: ${outputAttrs.size}.
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