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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2474) CQL support for compound columns
Date Fri, 19 Aug 2011 04:03:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087505#comment-13087505
] 

Jonathan Ellis commented on CASSANDRA-2474:
-------------------------------------------

What about this?  https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-BuiltinTableGeneratingFunctions%28UDTF%29

Could we write a UDTF such that we could write

{code}
SELECT transposed(subcolumn, value) FROM foo WHERE key=X AND column=Y
{code}

I'm guessing that would require some modifications to the UTDF code, it looks like it's single-column
only now.  But it shouldn't be much of a stretch to add support for more (he says sight unseen),
and it's in the "spirit" of the existing UDTF goals.

I think the LATERAL VIEW stuff is kind of orthogonal to the UTDF per se.  Basically a way
to allow using normal columns a select with UTDF because otherwise their compiler is too dumb
to handle mixing the two.

> CQL support for compound columns
> --------------------------------
>
>                 Key: CASSANDRA-2474
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2474
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API, Core
>            Reporter: Eric Evans
>              Labels: cql
>             Fix For: 1.0
>
>
> For the most part, this boils down to supporting the specification of compound column
names (the CQL syntax is colon-delimted terms), and then teaching the decoders (drivers) to
create structures from the results.

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