wankunde opened a new pull request #33702:
URL: https://github.com/apache/spark/pull/33702
…in EliminateOuterJoin
### What changes were proposed in this pull request?
For query
```
spark.range(200L).selectExpr("id AS a").createTempView("t1")
spark.range(300L).selectExpr("id AS b").createTempView("t2")
spark.sql("SELECT DISTINCT a FROM t1 LEFT JOIN t2 ON a = b").explain(true)
```
Before PR
```
== Optimized Logical Plan ==
Aggregate [b#3L], [b#3L, max(c#4L) AS c#20L]
+- Project [b#3L, c#4L]
+- Join LeftOuter, (a#2L = a#10L)
:- Project [id#0L AS a#2L, id#0L AS b#3L, id#0L AS c#4L]
: +- Range (0, 200, step=1, splits=Some(1))
+- Project [id#8L AS a#10L]
+- Range (0, 300, step=1, splits=Some(1))
```
After PR
```
== Optimized Logical Plan ==
Aggregate [b#277L], [b#277L, max(c#278L) AS c#290L]
+- Project [id#274L AS b#277L, id#274L AS c#278L]
+- Range (0, 200, step=1, splits=Some(2))
```
### Why are the changes needed?
Enhance EliminateOuterJoin rule
### Does this PR introduce any user-facing change?
No
### How was this patch tested?
Add UTs
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