Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/14132#discussion_r70885711
--- 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 --
The current grammar allows multiple query hints in a query. What will
happen if we do that? For example:
```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
```
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