Hi,
Thanks a lot for this. I could use isSkipQuery for the count(*) in sql
statement. Need to figure out if I can optimize the solr query (if applicable)
for other aggregate functions like SUM where I can use a simple stats query on
the given field.
Regards,
Sudip
-Original Message-
From: Hanifi Gunes [mailto:hgu...@maprtech.com]
Sent: 10 August 2015 PM 11:27
To: user; dev@drill.apache.org
Subject: Re: Apache Drill: How does the plug-in know that an aggregate function
is applied
+dev
+1 to Hakim. AbstractRR#isSkipQuery is the way to go. If you want more
details on this you should check out DRILL-2358[1] that is an umbrella issue
targeting to make count(*) queries more efficient per storage plugin.
Currently (I guess) JSON and Mongo(?) readers support it though.
1:
https://github.com/apache/drill/commit/54df129cab544c3df8e75a7dae3f85a91a9ded5a
On Thu, Aug 6, 2015 at 6:50 PM, Abdel Hakim Deneche adene...@maprtech.com
wrote:
Hi Sudip,
I'm not really an expert in this matter but I came recently across
isSkipQuery() method in AbstractRecordReader, it's javadoc states:
*Returns true if reader should skip all of the columns, reporting
number of
records only. Handling of a skip query is storage plugin-specific.*
You can take a look at JSONRecordReader for an example on how to use
isSkipQuery() to optimize the reading.
Thanks
On Thu, Aug 6, 2015 at 2:01 AM, Sudip Mukherjee
mukherjeesud...@hotmail.com
wrote:
Hi,
I am using apache drill recently with mongodb and trying to write a
basic plug-in for apache solr. Wanted to know how does the plug-in
know that an
count(*) query has been applied so that the query to data-source can
be optimized? Can i get it if I extend AbstractExprVisitor class?
Thanks,Sudip Mukherjee
--
Abdelhakim Deneche
Software Engineer
http://www.mapr.com/
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