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Posted to issues@spark.apache.org by "Allison Wang (Jira)" <ji...@apache.org> on 2020/10/19 17:55:00 UTC
[jira] [Created] (SPARK-33183) Bug in optimizer rule EliminateSorts
Allison Wang created SPARK-33183:
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Summary: Bug in optimizer rule EliminateSorts
Key: SPARK-33183
URL: https://issues.apache.org/jira/browse/SPARK-33183
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.1, 3.0.0
Reporter: Allison Wang
Currently, the rule {{EliminateSorts}} removes a global sort node if its child plan already satisfies the required sort order without checking if the child plan's ordering is local or global. For example, in the following scenario, the first sort shouldn't be removed because it has a stronger guarantee than the second sort even if the sort orders are the same for both sorts.
{code:java}
Sort(orders, global = True, ...)
Sort(orders, global = False, ...){code}
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