Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/19100#discussion_r136607388
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/OptimizeMetadataOnlyQuerySuite.scala
---
@@ -117,4 +117,12 @@ class OptimizeMetadataOnlyQuerySuite extends QueryTest
with SharedSQLContext {
"select partcol1, max(partcol2) from srcpart where partcol1 = 0 group
by rollup (partcol1)",
"select partcol2 from (select partcol2 from srcpart where partcol1 = 0
union all " +
"select partcol2 from srcpart where partcol1 = 1) t group by
partcol2")
+
+ test("SPARK-21884 Fix StackOverflowError on MetadataOnlyQuery") {
--- End diff --
+1 for preventing futhre regressino.
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