Davies Liu created SPARK-12913:
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Summary: Reimplement all builtin aggregate functions as
declarative function
Key: SPARK-12913
URL: https://issues.apache.org/jira/browse/SPARK-12913
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Davies Liu
As benchmarked and discussed here:
https://github.com/apache/spark/pull/10786/files#r50038294.
Benefits from codegen, the declarative aggregate function could be much faster
than imperative one, we should re-implement all the builtin aggregate
functions as declarative one.
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