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https://issues.apache.org/jira/browse/HIVE-14310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prasanth Jayachandran updated HIVE-14310:
-----------------------------------------
Description:
Follow up for HIVE-14214 which completely shuts off PPD when there is any
schema evolution. Some evolutions are safer for PPD like
byte -> short -> int -> long
-float -> double- This is unsafe, see comments in SchemaEvolution.java in the
patch
conversions between char, varchar and strings
For all other conversions we can disable PPD for that specific column that has
evolved by returning TruthValue.YES_NO
was:
Follow up for HIVE-14214 which completely shuts off PPD when there is any
schema evolution. Some evolutions are safer for PPD like
byte -> short -> int -> long
float -> double
conversions between char, varchar and strings
For all other conversions we can disable PPD for that specific column that has
evolved by returning TruthValue.YES_NO
> ORC schema evolution should not completely disable PPD
> ------------------------------------------------------
>
> Key: HIVE-14310
> URL: https://issues.apache.org/jira/browse/HIVE-14310
> Project: Hive
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Critical
> Attachments: HIVE-14310.1.patch, HIVE-14310.WIP.patch
>
>
> Follow up for HIVE-14214 which completely shuts off PPD when there is any
> schema evolution. Some evolutions are safer for PPD like
> byte -> short -> int -> long
> -float -> double- This is unsafe, see comments in SchemaEvolution.java in the
> patch
> conversions between char, varchar and strings
> For all other conversions we can disable PPD for that specific column that
> has evolved by returning TruthValue.YES_NO
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