[jira] [Commented] (CASSANDRA-6001) Add a Tracing line for index/seq scan queries

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13785302#comment-13785302 ] 

Jonathan Ellis commented on CASSANDRA-6001:
-------------------------------------------

How about this, to leave things as objects until we're ready to turn it into a string for tracing?

> Add a Tracing line for index/seq scan queries
> ---------------------------------------------
>
>                 Key: CASSANDRA-6001
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6001
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Lyuben Todorov
>             Fix For: 1.2.11
>
>         Attachments: 6001.patch, 6001-v2.txt
>
>
> Tracing should show the user why a specific index was selected.  Something like
> {noformat}
> Index mean cardinality is {users_by_lastname: 100, users_by_state: 2000, users_by_birthdate: 1000}.  Scanning with users_by_lastname.
> {noformat}



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