[Mondrian] Testing a Hive dialect

Fu Hongwei fuhongwei2006 at 163.com
Fri Feb 11 06:53:00 EST 2011

Hi Julian,
Thanks for the prompt reply.
The test is running on Hive 0.7.0, but a patch will be needed. I've started a jira on Hive and will submit it soon too.

There are too many failures in the test suite.  I'm still working on it, but I will submit the DialectTest.java and HiveDialect.java, so people interested can work on it together.
I think the point is first to make it running then speed it up.

Fu Hongwei 

发件人: Julian Hyde 
发送时间: 2011-02-11  00:19:26 
收件人: 'Mondrian developer mailing list' 
主题: RE: [Mondrian] Testing a Hive dialect 
I am well aware of the compromises with Hive. There is certainly an impedance mismatch between hadoop and the real-time analysis, and that is reflected in query response time. It is still useful  to have a Hive dialect, because as you say, Hive is improving all the time. And Pentaho is thinking about ways to bridge the impedance mismatch.

Can please you attach your code to the jira case as a patch? I will submit it.

Also please attach the output of the test suite, and describe the version of Hive you are running against. That will be a reference point for others who are working on Hive.


From: mondrian-bounces at pentaho.org [mailto:mondrian-bounces at pentaho.org] On Behalf Of Fu Hongwei
Sent: Thursday, February 10, 2011 1:29 AM
To: mondrian
Subject: [Mondrian] Testing a Hive dialect 

I'm new to the community. I don't know who to ask this for. 
I've written a Hive dialect for mondrian and been testing it.
The DialectTest is passed, but it's still failing other tests.

From what I can see it's still a long way to make an integration
of Hive and Mondrian practical.
1. It's really slow. It takes 1 or 2 days to run through all the tests, 
a low end estimation. The latency is too big for most applications.
It might take some major architectural change on the Hive side to solve
this problem.
2. Hive ql is still at a rather immature stage, partly because it's not 
really intended to be a full featured relational database. There are some
 bugs too, like the join behavior is incorrect at the current trunk.

I know there is already a jira about it.
How can I submit the code? Thanks

Fu Hongwei 
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