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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-5406) Allow CQL3 queries to do extra filter after getting the column slice on a composite primary key
Date Thu, 04 Apr 2013 21:38:17 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeremiah Jordan reassigned CASSANDRA-5406:
------------------------------------------

    Assignee: Jeremiah Jordan
    
> Allow CQL3 queries to do extra filter after getting the column slice on a composite primary
key
> -----------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5406
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5406
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jeremiah Jordan
>            Assignee: Jeremiah Jordan
>            Priority: Minor
>
> Let the following work:
> {noformat}
> CREATE TABLE "ChequeDeDup2" (
>   "bucketId" int,
>   "transitAba" int,
>   "transitAccount" bigint,
>   "serialNo" int,
>   amount bigint,
>   "subjectId" uuid,
>   "channelInd" ascii,
>   "creditAba" int,
>   "creditAccount" bigint,
>   "sourceTs" timestamp,
>   PRIMARY KEY ("bucketId", "transitAba", "transitAccount", "serialNo", amount, "subjectId")
> )
> select * from "ChequeDeDup2" where "bucketId" = 198 and "transitAba" >= 101 and "transitAccount"
= 198 and "serialNo" = 1 and "amount" = -1 order by "transitAba" desc , "transitAccount" desc,
"serialNo" desc, amount desc, "subjectId" DESC limit 5;
> Bad Request: PRIMARY KEY part transitAccount cannot be restricted (preceding part transitAba
is either not restricted or by a non-EQ relation)
> {noformat}
> The assumption seems to be that it is better to serialize all the data with transitAba
>= 198 back to the client side.  But it is *less* efficient for the server to serialize
all this data back to the client than it is to execute subsequent filters.
> The user should be allowed to trade off the CPU cost of filtering the data on the server
side with the IO cost of serializing all that data.

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