[jira] [Assigned] (SPARK-31398) Speed up reading dates in ORC

[Wenchen Fan (Jira)]

     [ 
https://issues.apache.org/jira/browse/SPARK-31398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Wenchen Fan reassigned SPARK-31398:
-----------------------------------

    Assignee: Maxim Gekk

> Speed up reading dates in ORC
> -----------------------------
>
>                 Key: SPARK-31398
>                 URL: https://issues.apache.org/jira/browse/SPARK-31398
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Maxim Gekk
>            Assignee: Maxim Gekk
>            Priority: Major
>
> Currently, ORC datasource converts values of DATE type to java.sql.Date and 
> the result to days since the epoch in Proleptic Gregorian calendar. ORC 
> datasource does such conversion when 
> spark.sql.orc.enableVectorizedReader is set to false.
> The conversion to java.sql.Date is not necessary because we can use 
> DaysWritable which performs rebasing in much more optimal way.



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