Matt Cheah created SPARK-13335:
----------------------------------
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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
