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Posted to issues@drill.apache.org by "Khurram Faraaz (JIRA)" <ji...@apache.org> on 2016/03/28 08:07:25 UTC
[jira] [Created] (DRILL-4545) Incorrect query plan for LIMIT 0
query
Khurram Faraaz created DRILL-4545:
-------------------------------------
Summary: Incorrect query plan for LIMIT 0 query
Key: DRILL-4545
URL: https://issues.apache.org/jira/browse/DRILL-4545
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 1.6.0
Environment: 4 node cluster CentOS
Reporter: Khurram Faraaz
Inner query has a LIMIT 1 and outer query has LIMIT 0. Looking at the query plan it looks like the outer LIMIT 0 is applied before the LIMIT 1 is applied to inner query. This does not seem right.
Drill 1.6.0 commit ID : fb09973e
{noformat}
0: jdbc:drill:schema=dfs.tmp> explain plan for select * from (select * from `employee.json` limit 1) limit 0;
+------+------+
| text | json |
+------+------+
| 00-00 Screen
00-01 Project(*=[$0])
00-02 SelectionVectorRemover
00-03 Limit(fetch=[0])
00-04 Limit(fetch=[1])
00-05 Limit(offset=[0], fetch=[0])
00-06 Scan(groupscan=[EasyGroupScan [selectionRoot=maprfs:/tmp/employee.json, numFiles=1, columns=[`*`], files=[maprfs:///tmp/employee.json]]])
{noformat}
Here is the data from JSON file
{noformat}
[root@centos-01 ~]# cat employee.json
{
"firstName": "John",
"lastName": "Smith",
"isAlive": true,
"age": 45,
"height_cm": 177.6,
"address": {
"streetAddress": "29 4th Street",
"city": "New York",
"state": "NY",
"postalCode": "10021-3100"
},
"phoneNumbers": [
{
"type": "home",
"number": "212 555-1234"
},
{
"type": "office",
"number": "646 555-4567"
}
],
"children": [],
"hobbies": ["scuba diving","hiking","biking","rock climbing","surfing"]
}
{noformat}
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