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https://issues.apache.org/jira/browse/IMPALA-2691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Rodoni closed IMPALA-2691.
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Resolution: Fixed
Fix Version/s: impala 2.3
> Missing examples of using a UDAF with a different intermediate type
> -------------------------------------------------------------------
>
> Key: IMPALA-2691
> URL: https://issues.apache.org/jira/browse/IMPALA-2691
> Project: IMPALA
> Issue Type: Improvement
> Components: Docs
> Affects Versions: Impala 2.2.4
> Reporter: Chris Channing
> Assignee: Alex Rodoni
> Priority: Minor
> Labels: usability
> Fix For: impala 2.3
>
> Attachments: udaf-sample.tar.gz
>
>
> The [current
> documentation|http://www.cloudera.com/content/www/en-us/documentation/enterprise/5-4-x/topics/impala_create_function.html]
> for UDAFs has a reference to 'INTERMEDIATE' but not how it should be used
> during function registration. Since [~tarmstrong] added the facility in the
> FE ([IMPALA-1829|https://issues.cloudera.org/browse/IMPALA-1829]) to allow
> function registrations with an intermediate type in the 2.3 release, we
> should provide examples of what this looks like, in particular, where a fixed
> buffer type is required.
> To facilitate this, I have attached an example UDAF which shows how a fixed
> buffer intermediate type can be used.
> DDL:
> {code}
> CREATE AGGREGATE FUNCTION myavgfn(double) RETURNS double INTERMEDIATE
> char(16) LOCATION '/foo/libudasample.so' INIT_FN='AvgInit'
> UPDATE_FN='AvgUpdate' MERGE_FN='AvgMerge' FINALIZE_FN='AvgFinalize';
> {code}
> Code/Build scripts:
> Refer to the attachment
> To build the UDAF, simply execute:
> cmake .
> make
> The output will be generated in build/
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