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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9977) Support counter-columns for native aggregates (sum,avg,max,min)
Date Mon, 07 Dec 2015 14:40:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15045020#comment-15045020
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Sylvain Lebresne commented on CASSANDRA-9977:
---------------------------------------------

bq. For a normal {{SELECT}} the type returned within the metadata is {{COUNTER}} but, with
the patch, if you use a native aggregate the type returned is {{BIGINT}}

I don't think returning one or the other makes much practical difference as {{counter}} and
{{bigint}} are pretty much the same thing as far as reads are concerned. I do agree that returning
{{counter}} feels more consistent so I would go for that, but that's arguably more of a personal
preference than anything else.

> Support counter-columns for native aggregates (sum,avg,max,min)
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-9977
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9977
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Noam Liran
>            Assignee: Robert Stupp
>             Fix For: 2.2.x
>
>
> When trying to SUM a column of type COUNTER, this error is returned:
> {noformat}
> InvalidRequest: code=2200 [Invalid query] message="Invalid call to function sum, none
of its type signatures match (known type signatures: system.sum : (tinyint) -> tinyint,
system.sum : (smallint) -> smallint, system.sum : (int) -> int, system.sum : (bigint)
-> bigint, system.sum : (float) -> float, system.sum : (double) -> double, system.sum
: (decimal) -> decimal, system.sum : (varint) -> varint)"
> {noformat}
> This might be relevant for other agg. functions.
> CQL for reproduction:
> {noformat}
> CREATE TABLE test (
>         key INT,
>         ctr COUNTER,
>         PRIMARY KEY (
>                 key
>         )
> );
> UPDATE test SET ctr = ctr + 1 WHERE key = 1;
> SELECT SUM(ctr) FROM test;
> {noformat}



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