Github user srinathshankar commented on a diff in the pull request:
https://github.com/apache/spark/pull/14867#discussion_r77675078
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/PlanParserSuite.scala
---
@@ -360,10 +360,54 @@ class PlanParserSuite extends PlanTest {
test("left anti join", LeftAnti, testExistence)
test("anti join", LeftAnti, testExistence)
+ // Test natural cross join
+ intercept("select * from a natural cross join b")
+
+ // Test natural join with a condition
+ intercept("select * from a natural join b on a.id = b.id")
+
// Test multiple consecutive joins
assertEqual(
"select * from a join b join c right join d",
table("a").join(table("b")).join(table("c")).join(table("d"),
RightOuter).select(star()))
+
+ // SPARK-17296
+ assertEqual(
+ "select * from t1 cross join t2 join t3 on t3.id = t1.id join t4 on
t4.id = t1.id",
+ table("t1")
+ .join(table("t2"), Cross)
+ .join(table("t3"), Inner, Option(Symbol("t3.id") ===
Symbol("t1.id")))
+ .join(table("t4"), Inner, Option(Symbol("t4.id") ===
Symbol("t1.id")))
+ .select(star()))
+
+ // Test multiple on clauses.
+ intercept("select * from t1 inner join t2 inner join t3 on col3 = col2
on col3 = col1")
+
+ // Parenthesis
+ assertEqual(
+ "select * from t1 inner join (t2 inner join t3 on col3 = col2) on
col3 = col1",
+ table("t1")
+ .join(table("t2")
+ .join(table("t3"), Inner, Option('col3 === 'col2)), Inner,
Option('col3 === 'col1))
+ .select(star()))
+ assertEqual(
+ "select * from t1 inner join (t2 inner join t3) on col3 = col2",
+ table("t1")
+ .join(table("t2").join(table("t3"), Inner, None), Inner,
Option('col3 === 'col2))
+ .select(star()))
+ assertEqual(
+ "select * from t1 inner join (t2 inner join t3 on col3 = col2)",
+ table("t1")
+ .join(table("t2").join(table("t3"), Inner, Option('col3 ===
'col2)), Inner, None)
+ .select(star()))
+
+ // Implicit joins.
+ assertEqual(
--- End diff --
Great, LGTM
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