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From "mck (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9532) Provide access to select statement's real column definitions
Date Tue, 09 Jun 2015 15:48:00 GMT


mck commented on CASSANDRA-9532:

Working with just 9532-2.0-v2.txt

 looks great! thanks heaps. it solves the original ticket description and that in the [comment|]

 and the trivial, in SelectionColumnMapping could the \*ColumnMapping\* methods be shortened
to \*Mapping\*, eg{noformat} .addColumnMapping(colSpec, column) --> .addMapping(colSpec,
 .addColumnMapping(colSpec, columns) --> .addMapping(colSpec, columns)
 .getColumnMappings() --> .getMappings(){noformat}
Only noticed because {{selectStatement.selection.getColumnMapping().getColumnMappings()}}
looked a little odd at first glance, and maybe   {{selectStatement.selection.getColumnMapping().getMappings()}}
would read better, but it's on the banally trivial side of things.

> Provide access to select statement's real column definitions
> ------------------------------------------------------------
>                 Key: CASSANDRA-9532
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: mck
>            Assignee: mck
>             Fix For: 3.x, 2.1.x, 2.0.x, 2.2.x
>         Attachments: 9532-2.0-v2.txt, 9532-2.1-v2.txt, 9532-2.2-v2.txt, 9532-trunk-v2.txt,
cassandra-2.0-9532.txt, cassandra-2.1-9532.txt, cassandra-2.2-9532.txt, trunk-9532.txt
> Currently there is no way to get access to the real ColumnDefinitions being used in a
> This information is there in
> {{selectStatement.selection.columns}} but is private.
> Giving public access would make it possible for third-party implementations of a {{QueryHandler}}
to work accurately with the real columns being queried and not have to work-around column
aliases (or when the rawSelectors don't map directly to ColumnDefinitions, eg in Selection.fromSelectors(..),
like functions), which is what one has to do today with going through ResultSet.metadata.names.
> This issue provides a very minimal patch to provide access to the already final and immutable

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