should throw "Ambiguous column reference key" Exception in particular join
condition
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Key: HIVE-2723
URL: https://issues.apache.org/jira/browse/HIVE-2723
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.8.0
Environment: Linux zongren-VirtualBox 3.0.0-14-generic #23-Ubuntu SMP
Mon Nov 21 20:34:47 UTC 2011 i686 i686 i386 GNU/Linux
java version "1.6.0_25"
hadoop-0.20.2-cdh3u0
hive-0.7.0-cdh3u0
Reporter: caofangkun
Priority: Minor
Fix For: 0.9.0
This Bug can be Repeated as following :
create table test(key string, value string);
create table test1(key string, value string);
1: Correct!
select t.key
from
(select a.key, b.key from (select * from src ) a right outer join (select *
from src1) b on (a.key = b.key)) t;
FAILED: Error in semantic analysis: Ambiguous column reference key
2: Uncorrect!! Should throw Exception as above too!
select t.key --Is this a.key or b.key ? It's ambiduous!
from
(select a.*, b.* from (select * from src ) a right outer join (select * from
src1) b on (a.value = b.value)) t;
Total MapReduce jobs = 1
Launching Job 1 out of 1
Number of reduce tasks not specified. Defaulting to jobconf value of: 1
In order to change the average load for a reducer (in bytes):
set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
set mapred.reduce.tasks=<number>
Starting Job = job_201201170959_0004, Tracking URL =
http://zongren-VirtualBox:50030/jobdetails.jsp?jobid=job_201201170959_0004
Kill Command = /home/zongren/workspace/hadoop-adh/bin/hadoop job
-Dmapred.job.tracker=zongren-VirtualBox:9001 -kill job_201201170959_0004
Hadoop job information for Stage-1: number of mappers: 2; number of reducers: 1
2012-01-17 11:02:47,507 Stage-1 map = 0%, reduce = 0%
2012-01-17 11:02:55,002 Stage-1 map = 100%, reduce = 0%
2012-01-17 11:03:04,240 Stage-1 map = 100%, reduce = 33%
2012-01-17 11:03:05,258 Stage-1 map = 100%, reduce = 100%
Ended Job = job_201201170959_0004
MapReduce Jobs Launched:
Job 0: Map: 2 Reduce: 1 HDFS Read: 669 HDFS Write: 216 SUCESS
Total MapReduce CPU Time Spent: 0 msec
OK
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