wangyum opened a new pull request #32216:
URL: https://github.com/apache/spark/pull/32216
### What changes were proposed in this pull request?
This pr makes propagate empty relation through Join if join condition is
empty. For example:
```scala
spark.sql("create table t1 using parquet as select id as a, id as b from
range(10)")
spark.sql("create table t2 using parquet as select id as a, id as b from
range(20)")
spark.sql("select t1.a from t1 left anti join t2").explain(true)
```
Before this pr:
```
== Optimized Logical Plan ==
Join LeftAnti
:- Project [a#6L]
: +- Relation default.t1[a#6L,b#7L] parquet
+- Project
+- Relation default.t2[a#8L,b#9L] parquet
```
After this pr:
```
== Optimized Logical Plan ==
LocalRelation <empty>, [a#6L]
```
### Why are the changes needed?
Improve query performance.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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