wangyum opened a new pull request #32218:
URL: https://github.com/apache/spark/pull/32218
### What changes were proposed in this pull request?
This pr improves `JoinSelection` when join condition is not defined. For
example:
```scala
spark.sql("set spark.sql.autoBroadcastJoinThreshold=-1")
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, t2.a from t1 full join t2").explain(true)
```
Before this pr:
```
== Physical Plan ==
AdaptiveSparkPlan isFinalPlan=false
+- BroadcastNestedLoopJoin BuildLeft, FullOuter
:- BroadcastExchange IdentityBroadcastMode, [id=#43]
: +- FileScan parquet default.t1[a#16L]
+- FileScan parquet default.t2[a#18L]
```
After this pr:
```
== Physical Plan ==
CartesianProduct
:- *(1) ColumnarToRow
: +- FileScan parquet default.t1[a#16L]
+- *(2) ColumnarToRow
+- FileScan parquet default.t2[a#18L]
```
### Why are the changes needed?
Avoid OOM and improve query performance.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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