Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14719#discussion_r78182198
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -1580,6 +1583,28 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
assert(df.persist.take(1).apply(0).toSeq(100).asInstanceOf[Long] ==
100)
}
+ test("""SPARK-17154: df("column_name") should return correct result when
we do self-join""") {
--- End diff --
this is a good question!
I'm also thinking about this. If a plan id matches more than one sub-tree
in the logical plan, should we just fail the query instead of using BFS to pick
the first one?
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