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https://issues.apache.org/jira/browse/HIVE-22962?focusedWorklogId=399412&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-399412
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ASF GitHub Bot logged work on HIVE-22962:
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Author: ASF GitHub Bot
Created on: 06/Mar/20 22:54
Start Date: 06/Mar/20 22:54
Worklog Time Spent: 10m
Work Description: jcamachor commented on pull request #943: HIVE-22962
URL: https://github.com/apache/hive/pull/943
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Issue Time Tracking
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Worklog Id: (was: 399412)
Remaining Estimate: 0h
Time Spent: 10m
> Reuse HiveRelFieldTrimmer instance across queries
> -------------------------------------------------
>
> Key: HIVE-22962
> URL: https://issues.apache.org/jira/browse/HIVE-22962
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22962.01.patch, HIVE-22962.02.patch,
> HIVE-22962.03.patch, HIVE-22962.04.patch, HIVE-22962.05.patch,
> HIVE-22962.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently we create multiple {{HiveRelFieldTrimmer}} instances per query.
> {{HiveRelFieldTrimmer}} uses a method dispatcher that has a built-in caching
> mechanism: given a certain object, it stores the method that was called for
> the object class. However, by instantiating the trimmer multiple times per
> query and across queries, we create a new dispatcher with each instantiation,
> thus effectively removing the caching mechanism that is built within the
> dispatcher.
> This issue is to reutilize the same {{HiveRelFieldTrimmer}} instance within a
> single query and across queries.
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