+1 agreed
Also as a general script programming practice I check if the variables I am
going to use are NON empty before using them…nothing related to Hive scripts
If [ ${freq} == "" ]
then
echo "variable freq is empty…exiting"
exit 1
Fi
From: Anthony Urso <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Date: Tuesday, April 30, 2013 7:20 PM
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>, sumit ghosh
<[email protected]<mailto:[email protected]>>
Subject: Re: Variable resolution Fails
Your shell is expanding the variable ${env:freq}, which doesn't exist in the
shell's environment, so hive is getting the empty string in that place. If you
are always intending to run your query like this, just use ${freq} which will
be expanded as expected by bash and then passed to hive.
Cheers,
Anthony
On Tue, Apr 30, 2013 at 4:40 PM, sumit ghosh
<[email protected]<mailto:[email protected]>> wrote:
Hi,
The following variable freq fails to resolve:
bash-4.1$ export freq=MNTH
bash-4.1$ echo $freq
MNTH
bash-4.1$ hive -e "select ${env:freq} as dr from dual"
Logging initialized using configuration in
file:/etc/hive/conf.dist/hive-log4j.properties
Hive history
file=/hadoop1/hive_querylog/sumighos/hive_job_log_sumighos_201304302321_1867815625.txt
FAILED: ParseException line 1:8 cannot recognize input near 'as' 'dr' 'from' in
select clause
bash-4.1$
Here dual is a table with 1 row.
What am I am doing wrong? When I try to resolve freq - it is empty!!
$ hive -S -e "select '${env:freq}' as dr from dual"
$
Thanks,
Sumit
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