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https://issues.apache.org/jira/browse/IMPALA-7121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Kaszab reassigned IMPALA-7121:
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Assignee: Gabor Kaszab
> Clean up partitionIds_ member from HdfsTable
> --------------------------------------------
>
> Key: IMPALA-7121
> URL: https://issues.apache.org/jira/browse/IMPALA-7121
> Project: IMPALA
> Issue Type: Improvement
> Components: Catalog
> Affects Versions: Impala 2.12.0
> Reporter: Gabor Kaszab
> Assignee: Gabor Kaszab
> Priority: Major
>
> HdfsTable already has a number of internal structures that meant to speed-up
> processes like partition pruning. partitionIds_ is a HashSet of partition IDs
> but apparently we already have this information in partitionMap_ that is a
> mapping between partition IDs and HdfsPartitions. As a result we can simply
> drop partitionsIds_ and modify getPartitionIds() to return
> partitionMap_.keySet().
> This is not expected to introduce regression for the following reasons:
> * HashMap.keySet() is O(1) complex as it returns a wrapper around an
> internal set of keys from the HashMap.
> * We have to be careful not to modify this keySet() returned from
> getPartitionIds() because that would also alter the partitionMap_ member.
> This is safe as all callsites of getPartitionIds() immediately copies the
> items of the set to a separate set.
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