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Posted to issues@spark.apache.org by "Matt Cheah (JIRA)" <ji...@apache.org> on 2016/02/16 08:26:18 UTC

[jira] [Created] (SPARK-13335) Optimize collect_list and collect_set with declarative aggregates

Matt Cheah created SPARK-13335:
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             Summary: Optimize collect_list and collect_set with declarative aggregates
                 Key: SPARK-13335
                 URL: https://issues.apache.org/jira/browse/SPARK-13335
             Project: Spark
          Issue Type: Improvement
            Reporter: Matt Cheah


Based on discussion from SPARK-9301, we can optimize collect_set and collect_list with declarative aggregate expressions, as opposed to using Hive UDAFs. The problem with Hive UDAFs is that they require converting the data items from catalyst types back to external types repeatedly. We can get around this by implementing declarative aggregate expressions.



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