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| author | Davies Liu <davies@databricks.com> | 2016-02-02 11:50:14 -0800 |
|---|---|---|
| committer | Davies Liu <davies.liu@gmail.com> | 2016-02-02 11:50:14 -0800 |
| commit | be5dd881f1eff248224a92d57cfd1309cb3acf38 (patch) | |
| tree | 7fdf890c80dc6a7e63028b0829f1020ca0c65a54 /streaming | |
| parent | 7f6e3ec79b77400f558ceffa10b2af011962115f (diff) | |
| download | spark-be5dd881f1eff248224a92d57cfd1309cb3acf38.tar.gz spark-be5dd881f1eff248224a92d57cfd1309cb3acf38.tar.bz2 spark-be5dd881f1eff248224a92d57cfd1309cb3acf38.zip | |
[SPARK-12913] [SQL] Improve performance of stat functions
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.
Author: Davies Liu <davies@databricks.com>
Closes #10960 from davies/stddev.
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