Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18692
You also need to resolve another case:
```Scala
Seq((1, 2)).toDF("col1", "col2").write.saveAsTable("t1")
Seq(1, 2).toDF("col").write.saveAsTable("t2")
sql("SELECT * FROM t1, t2 WHERE t1.col1 = t1.col2 AND t1.col1 = 1
AND t2.col = 1")
```
This new rule can infer the unneeded join conditions, `col2 = col1 AND col2
= col AND col1 = col`
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