Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/14719#discussion_r78144199
--- 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 --
What happens when:
val joined = df.join(df, "inner") // columns: col1, col2, col3, col1,
col2, col3
val selected = joined.select(df("col1"))
As there are two plans with the same plan id, the breadth-first search will
get one plan among them. So df("col") will be resolved. However, I think in
this case, we should have an ambiguous error message.
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