Github user srinathshankar commented on a diff in the pull request:
https://github.com/apache/spark/pull/14867#discussion_r77417316
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/PlanParserSuite.scala
---
@@ -360,10 +360,25 @@ 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",
--- End diff --
How is something like
SELECT * FROM T1 INNER JOIN T2 INNER JOIN T3 ON col3 = col2 ON col3 = col1;
supposed to parse ?
Without your change it returns the following error:
org.apache.spark.sql.AnalysisException: cannot resolve '`col3`' given input
columns: [col1, col2]; line 1 pos 63
which I don't understand. The following parses though:
SELECT * FROM T1 INNER JOIN T2 INNER JOIN T3 ON col1 = col2 ON col2 = col1
and returns a result
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