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https://issues.apache.org/jira/browse/CASSANDRA-5336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13602799#comment-13602799
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Steven Lowenthal commented on CASSANDRA-5336:
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Doesn't get_count count columns, and not rows?
> C* crashes with an OOM error when using the Simba Driver on a very wide table
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-5336
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5336
> Project: Cassandra
> Issue Type: Bug
> Components: API
> Affects Versions: 1.1.6
> Environment: C* on a Mac with 1GB VM. Simba ODBC driver
> Reporter: Steven Lowenthal
> Attachments: nhanes600-10k.tarZ, thrift.in, thrift.out
>
>
> The Simba driver executes a version of a count(*) query:
> SELECT SUM(1) from nhanes3 having sum(1) > 0. It uses this format so ODBC
> returns a no rows found error if the table is empty. It translates into a
> series of get_range_slice calls which bring back all of the rows, and for
> every row, it brings back every single column name. C* crashes with an OOM
> in the thrift code. The table has almost 600 columns of mixed text and
> numeric data with many empty values.
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