Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14426
Hi, @watermen . You can try that like this.
```scala
scala> spark.range(1000000000).createOrReplaceTempView("t1")
scala> spark.range(1000000000).createOrReplaceTempView("t2")
scala> spark.range(1000000000).createOrReplaceTempView("t3")
scala> sql("SELECT * FROM t1 JOIN t2 ON t1.id = t2.id JOIN t3 ON t1.id =
t3.id").explain
== Physical Plan ==
*SortMergeJoin [id#0L], [id#8L], Inner
:- *SortMergeJoin [id#0L], [id#4L], Inner
: :- *Sort [id#0L ASC], false, 0
: : +- Exchange hashpartitioning(id#0L, 200)
: : +- *Range (0, 1000000000, splits=8)
: +- *Sort [id#4L ASC], false, 0
: +- ReusedExchange [id#4L], Exchange hashpartitioning(id#0L, 200)
+- *Sort [id#8L ASC], false, 0
+- ReusedExchange [id#8L], Exchange hashpartitioning(id#0L, 200)
scala> sql("SELECT /*+ MAPJOIN(t1) */ * FROM t1 JOIN t2 ON t1.id = t2.id
JOIN t3 ON t1.id = t3.id").explain
== Physical Plan ==
*SortMergeJoin [id#0L], [id#8L], Inner
:- *Sort [id#0L ASC], false, 0
: +- Exchange hashpartitioning(id#0L, 200)
: +- *BroadcastHashJoin [id#0L], [id#4L], Inner, BuildLeft
: :- BroadcastExchange HashedRelationBroadcastMode(List(input[0,
bigint, false]))
: : +- *Range (0, 1000000000, splits=8)
: +- *Range (0, 1000000000, splits=8)
+- *Sort [id#8L ASC], false, 0
+- Exchange hashpartitioning(id#8L, 200)
+- *Range (0, 1000000000, splits=8)
scala> sql("SELECT /*+ MAPJOIN(t2) */ * FROM t1 JOIN t2 ON t1.id = t2.id
JOIN t3 ON t1.id = t3.id").explain
== Physical Plan ==
*SortMergeJoin [id#0L], [id#8L], Inner
:- *Sort [id#0L ASC], false, 0
: +- Exchange hashpartitioning(id#0L, 200)
: +- *BroadcastHashJoin [id#0L], [id#4L], Inner, BuildRight
: :- *Range (0, 1000000000, splits=8)
: +- BroadcastExchange HashedRelationBroadcastMode(List(input[0,
bigint, false]))
: +- *Range (0, 1000000000, splits=8)
+- *Sort [id#8L ASC], false, 0
+- Exchange hashpartitioning(id#8L, 200)
+- *Range (0, 1000000000, splits=8)
scala> sql("SELECT /*+ MAPJOIN(t3) */ * FROM t1 JOIN t2 ON t1.id = t2.id
JOIN t3 ON t1.id = t3.id").explain
== Physical Plan ==
*BroadcastHashJoin [id#0L], [id#8L], Inner, BuildRight
:- *SortMergeJoin [id#0L], [id#4L], Inner
: :- *Sort [id#0L ASC], false, 0
: : +- Exchange hashpartitioning(id#0L, 200)
: : +- *Range (0, 1000000000, splits=8)
: +- *Sort [id#4L ASC], false, 0
: +- ReusedExchange [id#4L], Exchange hashpartitioning(id#0L, 200)
+- BroadcastExchange HashedRelationBroadcastMode(List(input[0, bigint,
false]))
+- *Range (0, 1000000000, splits=8)
```
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