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Posted to dev@drill.apache.org by "Khurram Faraaz (JIRA)" <ji...@apache.org> on 2016/09/03 18:38:20 UTC
[jira] [Created] (DRILL-4875) select over array of maps returns
incorrect results
Khurram Faraaz created DRILL-4875:
-------------------------------------
Summary: select over array of maps returns incorrect results
Key: DRILL-4875
URL: https://issues.apache.org/jira/browse/DRILL-4875
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 1.9.0
Environment: 4 node cluster CentOS
Reporter: Khurram Faraaz
Priority: Critical
select over array of maps returns incorrect results
Drill 1.9.0 git commit ID : 28d315bbb
Data used in test
{noformat}
[test@centos-a ~]# cat arrayofmaps.json
{"arr":[{"key":"a"},{"key":"b"},{"key":"c"},{"key":"d"}]}
{noformat}
Array elements are
{noformat}
0: jdbc:drill:schema=dfs.tmp> select t.arr from `arrayofmaps.json` t;
+----------------------------------------------------+
| arr |
+----------------------------------------------------+
| [{"key":"a"},{"key":"b"},{"key":"c"},{"key":"d"}] |
+----------------------------------------------------+
1 row selected (0.289 seconds)
{noformat}
The below query should return 4 rows, each row containing one value a,b,c and d respectively
However query just returns only one value, which is not correct.
{noformat}
0: jdbc:drill:schema=dfs.tmp> select t.arr.key from `arrayofmaps.json` t where t.arr.key is not null;
+---------+
| EXPR$0 |
+---------+
| a |
+---------+
1 row selected (0.33 seconds)
{noformat}
Explain plan for above failing query
{noformat}
0: jdbc:drill:schema=dfs.tmp> explain plan for select t.arr.key from `arrayofmaps.json` t where t.arr.key is not null;
+------+------+
| text | json |
+------+------+
| 00-00 Screen
00-01 Project(EXPR$0=[$0])
00-02 SelectionVectorRemover
00-03 Filter(condition=[IS NOT NULL($0)])
00-04 Project(ITEM=[ITEM($0, 'key')])
00-05 Scan(groupscan=[EasyGroupScan [selectionRoot=maprfs:/tmp/arrayofmaps.json, numFiles=1, columns=[`arr`.`key`], files=[maprfs:///tmp/arrayofmaps.json]]])
{noformat}
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