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From "Arina Ielchiieva (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5375) Nested loop join: return correct result for left join
Date Wed, 22 Mar 2017 16:38:41 GMT
Arina Ielchiieva created DRILL-5375:
---------------------------------------

             Summary: Nested loop join: return correct result for left join
                 Key: DRILL-5375
                 URL: https://issues.apache.org/jira/browse/DRILL-5375
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.8.0
            Reporter: Arina Ielchiieva
            Assignee: Arina Ielchiieva


Mini repro:
1. Create 2 Hive tables with data
{code}
CREATE TABLE t1 (
  FYQ varchar(999),
  dts varchar(999),
  dte varchar(999)
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';

2016-Q1,2016-06-01,2016-09-30
2016-Q2,2016-09-01,2016-12-31
2016-Q3,2017-01-01,2017-03-31
2016-Q4,2017-04-01,2017-06-30

CREATE TABLE t2 (
  who varchar(999),
  event varchar(999),
  dt varchar(999)
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';

aperson,did somthing,2017-01-06
aperson,did somthing else,2017-01-12
aperson,had chrsitmas,2016-12-26
aperson,went wild,2016-01-01
{code}
2. Impala Query shows correct result
{code}
select t2.dt, t1.fyq, t2.who, t2.event
from t2
left join t1 on t2.dt between t1.dts and t1.dte
order by t2.dt;
+------------+---------+---------+-------------------+
| dt         | fyq     | who     | event             |
+------------+---------+---------+-------------------+
| 2016-01-01 | NULL    | aperson | went wild         |
| 2016-12-26 | 2016-Q2 | aperson | had chrsitmas     |
| 2017-01-06 | 2016-Q3 | aperson | did somthing      |
| 2017-01-12 | 2016-Q3 | aperson | did somthing else |
+------------+---------+---------+-------------------+
{code}

3. Drill query shows wrong results:
{code}
alter session set planner.enable_nljoin_for_scalar_only=false;
use hive;
select t2.dt, t1.fyq, t2.who, t2.event
from t2
left join t1 on t2.dt between t1.dts and t1.dte
order by t2.dt;

+-------------+----------+----------+--------------------+
|     dt      |   fyq    |   who    |       event        |
+-------------+----------+----------+--------------------+
| 2016-12-26  | 2016-Q2  | aperson  | had chrsitmas      |
| 2017-01-06  | 2016-Q3  | aperson  | did somthing       |
| 2017-01-12  | 2016-Q3  | aperson  | did somthing else  |
+-------------+----------+----------+--------------------+
3 rows selected (2.523 seconds)
{code}



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