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From "Robert Hou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4707) Conflicting columns names under case-insensitive policy lead to either memory leak or incorrect result
Date Thu, 09 Jun 2016 00:37:21 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15321712#comment-15321712
] 

Robert Hou commented on DRILL-4707:
-----------------------------------

Here is another query:

SELECT s.student_id as student, s.name as StudenT, s.gpa as StudenT from student s join hive.alltypesp1
h on (s.student_id = h.c1);
Error: SYSTEM ERROR: IllegalStateException: Failure while reading vector.  Expected vector
class of org.apache.drill.exec.vector.NullableVarBinaryVector but was holding vector class
org.apache.drill.exec.vector.NullableFloat8Vector, field= StudenT0(FLOAT8:OPTIONAL) 

student_id is an integer
name is a varchar
gpa is a double

c1 is an integer


0: jdbc:drill:zk=10.10.100.186:5181> select version, commit_id, commit_message from sys.version;
+-----------------+-------------------------------------------+--------------------------------------------+
|     version     |                 commit_id                 |               commit_message
              |
+-----------------+-------------------------------------------+--------------------------------------------+
| 1.7.0-SNAPSHOT  | a07f4de7e8725f7971ace308e81a241b7b07b5b6  | DRILL-3522: Fix for sporadic
Mongo errors  |
+-----------------+-------------------------------------------+--------------------------------------------+

> Conflicting columns names under case-insensitive policy lead to either memory leak or
incorrect result
> ------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-4707
>                 URL: https://issues.apache.org/jira/browse/DRILL-4707
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Jinfeng Ni
>            Assignee: Jinfeng Ni
>            Priority: Critical
>
> On latest master branch:
> {code}
> select version, commit_id, commit_message from sys.version;
> +-----------------+-------------------------------------------+---------------------------------------------------------------------------------+
> |     version     |                 commit_id                 |                     
           commit_message                                  |
> +-----------------+-------------------------------------------+---------------------------------------------------------------------------------+
> | 1.7.0-SNAPSHOT  | 3186217e5abe3c6c2c7e504cdb695567ff577e4c  | DRILL-4607: Add a split
function that allows to separate string by a delimiter  |
> +-----------------+-------------------------------------------+---------------------------------------------------------------------------------+
> {code}
> If a query has two conflicting column names under case-insensitive policy, Drill will
either hit memory leak, or incorrect issue.
> Q1.
> {code}
> select r_regionkey as XYZ, r_name as xyz FROM cp.`tpch/region.parquet`;
> Error: SYSTEM ERROR: IllegalStateException: Memory was leaked by query. Memory leaked:
(131072)
> Allocator(op:0:0:1:Project) 1000000/131072/2490368/10000000000 (res/actual/peak/limit)
> Fragment 0:0
> {code}
> Q2: return only one column in the result. 
> {code}
> select n_nationkey as XYZ, n_regionkey as xyz FROM cp.`tpch/nation.parquet`;
> +------+
> | XYZ  |
> +------+
> | 0    |
> | 1    |
> | 1    |
> | 1    |
> | 4    |
> | 0    |
> | 3    |
> {code}
> The cause of the problem seems to be that the Project thinks the two incoming columns
as identical (since Drill adopts case-insensitive for column names in execution). 
> The planner should make sure that the conflicting columns are resolved, since execution
is name-based. 



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