Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11190#discussion_r53545044
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -2105,6 +2105,22 @@ class SQLQuerySuite extends QueryTest with
SharedSQLContext {
assert(error.getMessage contains "grouping_id() can only be used with
GroupingSets/Cube/Rollup")
}
+ test("uncorrelated scalar subquery") {
--- End diff --
About test coverage:
let's create a subquery suite and move the test cases there.
Also it would be great to have at least once test case that actually runs
on a dataset that is not generated by just select x, because I worry in the
future we add some special optimizations and then all the test cases here
become no-op.
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