[jira] [Work logged] (HIVE-24399) Optimize Deserializer creation

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-24399?focusedWorklogId=512882&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-512882 ]

ASF GitHub Bot logged work on HIVE-24399:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 17/Nov/20 13:00
            Start Date: 17/Nov/20 13:00
    Worklog Time Spent: 10m 
      Work Description: pvary opened a new pull request #1682:
URL: https://github.com/apache/hive/pull/1682


   ### What changes were proposed in this pull request?
   - `Table.checkValidity` should use `getDeserializer` instead of `getDeserializerFromMetaStore`. This will use the cached version of the Deserializer so it will prevent creating a new one.
   - `SemanticAnalyzer.genConversionSelectOperator` should get a `Deserializer` as an input parameter, since we already has that at hand
   - When we are generating the FileSinkPlan on an destination table, we should reuse the table deserializer to get the columns whenever it is possible
   
   ### Why are the changes needed?
   To speed up query planning
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   Unit tests
   


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 512882)
    Remaining Estimate: 0h
            Time Spent: 10m

> Optimize Deserializer creation
> ------------------------------
>
>                 Key: HIVE-24399
>                 URL: https://issues.apache.org/jira/browse/HIVE-24399
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Peter Vary
>            Assignee: Peter Vary
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When running a query on a table using a non-default SerDe we often recreate the Deserializer object. This could be costly and often not necessary.
> We should optimize this as much as possible.



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