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https://issues.apache.org/jira/browse/SPARK-20718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhenhua Wang updated SPARK-20718:
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Description:
Since `constraints` in `QueryPlan` is a set, the order of filters can differ.
Usually this is ok because of canonicalization. However, in
`FileSourceScanExec`, its data filters and partition filters are sequences, and
their orders are not canonicalized. So `def sameResult` returns different
results for different orders of data/partition filters. This leads to, e.g.
different decision for `ReuseExchange`, and thus results in unstable
performance.
The same issue exists in `HiveTableScanExec`.
was:Since `constraints` in `QueryPlan` is a set, the order of filters can
differ. Usually this is ok because of canonicalization. However, in
`FileSourceScanExec`, its data filters and partition filters are sequences, and
their orders are not canonicalized. So `def sameResult` returns different
results for different orders of data/partition filters. This leads to, e.g.
different decision for `ReuseExchange`, and thus results in unstable
performance.
> FileSourceScanExec with different filter orders should be the same after
> canonicalization
> -
>
> Key: SPARK-20718
> URL: https://issues.apache.org/jira/browse/SPARK-20718
> Project: Spark
> Issue Type: Bug
> Components: SQL
>Affects Versions: 2.2.0
>Reporter: Zhenhua Wang
>Assignee: Zhenhua Wang
> Fix For: 2.2.0
>
>
> Since `constraints` in `QueryPlan` is a set, the order of filters can differ.
> Usually this is ok because of canonicalization. However, in
> `FileSourceScanExec`, its data filters and partition filters are sequences,
> and their orders are not canonicalized. So `def sameResult` returns different
> results for different orders of data/partition filters. This leads to, e.g.
> different decision for `ReuseExchange`, and thus results in unstable
> performance.
> The same issue exists in `HiveTableScanExec`.
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