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Posted to issues@spark.apache.org by "Marco Gaido (JIRA)" <ji...@apache.org> on 2018/02/09 13:57:00 UTC
[jira] [Created] (SPARK-23375) Optimizer should remove unneeded
Sort
Marco Gaido created SPARK-23375:
-----------------------------------
Summary: Optimizer should remove unneeded Sort
Key: SPARK-23375
URL: https://issues.apache.org/jira/browse/SPARK-23375
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.0
Reporter: Marco Gaido
As pointed out in SPARK-23368, as of now there is no rule to remove the Sort operator on an already sorted plan, ie. if we have a query like:
{{code}}
SELECT b
FROM (
SELECT a, b
FROM table1
ORDER BY a
) t
ORDER BY a
{{code}}
The sort is actually executed twice, even though it is not needed.
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