[jira] [Commented] (CASSANDRA-6151) CqlPagingRecorderReader Used when Partition Key Is Explicitly Stated

["Brandon Williams (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13788231#comment-13788231 ] 

Brandon Williams commented on CASSANDRA-6151:
---------------------------------------------

To be fair, I'm not sure why you'd use M/R for a single partition, but I'll let Alex decide what to do based on difficulty here.

> CqlPagingRecorderReader Used when Partition Key Is Explicitly Stated
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-6151
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6151
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>            Reporter: Russell Alexander Spitzer
>            Assignee: Alex Liu
>            Priority: Minor
>
> From http://stackoverflow.com/questions/19189649/composite-key-in-cassandra-with-pig/19211546#19211546
> The user was attempting to load a single partition using a where clause in a pig load statement. 
> CQL Table
> {code}
> CREATE table data (
>   occurday  text,
>   seqnumber int,
>   occurtimems bigint,
>   unique bigint,
>   fields map<text, text>,
>   primary key ((occurday, seqnumber), occurtimems, unique)
> )
> {code}
> Pig Load statement Query
> {code}
> data = LOAD 'cql://ks/data?where_clause=seqnumber%3D10%20AND%20occurday%3D%272013-10-01%27' USING CqlStorage();    
> {code}
> This results in an exception when processed by the the CqlPagingRecordReader which attempts to page this query even though it contains at most one partition key. This leads to an invalid CQL statement. 
> CqlPagingRecordReader Query
> {code}
> SELECT * FROM "data" WHERE token("occurday","seqnumber") > ? AND
> token("occurday","seqnumber") <= ? AND occurday='A Great Day' 
> AND seqnumber=1 LIMIT 1000 ALLOW FILTERING
> {code}
> Exception
> {code}
>  InvalidRequestException(why:occurday cannot be restricted by more than one relation if it includes an Equal)
> {code}
> I'm not sure it is worth the special case but, a modification to not use the paging record reader when the entire partition key is specified would solve this issue. 



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