Details
-
Bug
-
Status: Resolved
-
Minor
-
Resolution: Fixed
-
0.13.0, 0.13.1, 0.14.0
Description
I got a IndexOutOfBoundsException with a SQL in hive0.13.1. But it runs well on hive0.11. Here is the example sql which can trigger the exception.
create table test_join_1(a string, b string);
create table test_join_2(a string, b string);
-- got an IndexOutOfBoundsException error
explain
select * from
(
SELECT a a, b b
FROM test_join_1
)t1
join
(
SELECT a a, b b
FROM test_join_1
)t2
on t1.a = t2.a
and t1.a = t2.b
join
(
select a from test_join_2
)t3 on t1.a = t3.a;
And here is some stack information:
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.get(ArrayList.java:382)
at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.mergeJoins(SemanticAnalyzer.java:7403)
at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.mergeJoinTree(SemanticAnalyzer.java:7616)
at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:8946)
at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:9220)
...
But sql as below runs well.
explain select * from
(
SELECT a a, b b
FROM test_join_1
)t1
join
(
SELECT a a, b b
FROM test_join_1
)t2
on t1.a = t2.a
and t2.a = t2.b
join
(
select a from test_join_2
)t3 on t1.a = t3.a;
I didn't quite understand the details of mergejoin. But I noticed the patch in HIVE-5556 edited SemanticAnalyzer.java with the change below:
- if ((targetCondn == null) || (nodeCondn.size() != targetCondn.size())) { - return -1; + if ( targetCondn == null ) { + return new ObjectPair(-1, null); + }
Maybe it's a good idea to revert the logic of the 'if' statement as before.
