Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14132#discussion_r70892189
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1774,6 +1775,34 @@ class Analyzer(
}
/**
+ * Substitute Hints.
+ */
+ object SubstituteHint extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
--- End diff --
Nested one works like the design. I'm making testcase to ensure that.
Here is a example for your query.
```scala
spark.range(10).createOrReplaceTempView("tbl_a")
spark.range(20).createOrReplaceTempView("tbl_b")
spark.range(30).createOrReplaceTempView("tbl_c")
val plan = sql(
"""SELECT /*+ MAPJOIN(tbl_a, tbl_a) */
| *
|FROM tbl_a A
| JOIN tbl_b B
| ON B.id = A.id
| JOIN (SELECT /*+ MAPJOIN(tbl_c) */
| XA.id
| FROM tbl_b XA
| LEFT SEMI JOIN tbl_c XB
| ON XB.id = XA.id) C
| ON C.id = A.id
""".stripMargin).queryExecution.optimizedPlan
'Join Inner, (id#0L = id#0L)
:- 'Join Inner, (id#0L = id#0L)
: :- BroadcastHint
: : +- Range (0, 10, splits=2)
: +- Range (0, 20, splits=2)
+- 'Join LeftSemi, (id#0L = id#0L)
:- Range (0, 20, splits=2)
+- BroadcastHint
+- Range (0, 30, splits=2)
```
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