Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17770#discussion_r115913359
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/AnalysisSuite.scala
---
@@ -441,4 +441,17 @@ class AnalysisSuite extends AnalysisTest with
ShouldMatchers {
checkAnalysis(SubqueryAlias("tbl", testRelation).as("tbl2"),
testRelation)
}
+
+ test("analysis barrier") {
+ // [[AnalysisBarrier]] will be removed after analysis
+ checkAnalysis(
+ Project(Seq(UnresolvedAttribute("tbl.a")),
+ AnalysisBarrier(SubqueryAlias("tbl", testRelation))),
+ Project(testRelation.output, SubqueryAlias("tbl", testRelation)))
+
+ // Make sure we won't resolve the plans wrapped in an
[[AnalysisBarrier]]
+ val barrier =
AnalysisBarrier(Project(Seq(UnresolvedAttribute("tbl.b")),
+ SubqueryAlias("tbl", testRelation)))
+ assertAnalysisError(barrier, Seq("cannot resolve '`tbl.b`'"))
--- End diff --
`CheckAnalysis`. We wrap an unresolved plan with a barrier. So the
analyzer won't go through it and it remains unresolved.
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