wuyi created SPARK-33536:
----------------------------
Summary: Incorrect join results when joining twice with the same DF
Key: SPARK-33536
URL: https://issues.apache.org/jira/browse/SPARK-33536
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.1, 3.0.0, 3.1.0
Reporter: wuyi
{code:java}
val emp1 = Seq[TestData](
TestData(1, "sales"),
TestData(2, "personnel"),
TestData(3, "develop"),
TestData(4, "IT")).toDS()
val emp2 = Seq[TestData](
TestData(1, "sales"),
TestData(2, "personnel"),
TestData(3, "develop")).toDS()
val emp3 = emp1.join(emp2, emp1("key") === emp2("key")).select(emp1("*"))
emp1.join(emp3, emp1.col("key") === emp3.col("key"),
"left_outer").select(emp1.col("*"), emp3.col("key").as("e2")).show()
// wrong result
+---+---------+---+
|key| value| e2|
+---+---------+---+
| 1| sales| 1|
| 2|personnel| 2|
| 3| develop| 3|
| 4| IT| 4|
+---+---------+---+
{code}
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