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From "Carl Steinbach (JIRA)" <>
Subject [jira] [Commented] (HIVE-11981) ORC Schema Evolution Issues (Vectorized, ACID, and Non-Vectorized)
Date Thu, 19 Nov 2015 08:37:11 GMT


Carl Steinbach commented on HIVE-11981:

bq. This adds hive.exec.schema.evolution to ... Although it seems to be a general
parameter, this JIRA issue is ORC-specific...

If this property is ORC specific then it seems like a mistake to name it hive.exec.orc.schema.evolution.
Is there a good reason why "orc" doesn't appear in the property name or property description?

> ORC Schema Evolution Issues (Vectorized, ACID, and Non-Vectorized)
> ------------------------------------------------------------------
>                 Key: HIVE-11981
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive, Transactions
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>              Labels: TODOC2.0
>             Fix For: 2.0.0
>         Attachments: HIVE-11981.01.patch, HIVE-11981.02.patch, HIVE-11981.03.patch, HIVE-11981.05.patch,
HIVE-11981.06.patch, HIVE-11981.07.patch, HIVE-11981.08.patch, HIVE-11981.09.patch, HIVE-11981.091.patch,
HIVE-11981.092.patch, HIVE-11981.093.patch, HIVE-11981.094.patch, HIVE-11981.095.patch, HIVE-11981.096.patch,
HIVE-11981.097.patch, HIVE-11981.098.patch, HIVE-11981.099.patch, HIVE-11981.0991.patch, HIVE-11981.0992.patch,
ORC Schema Evolution Issues.docx
> High priority issues with schema evolution for the ORC file format.
> Schema evolution here is limited to adding new columns and a few cases of column type-widening
(e.g. int to bigint).
> Renaming columns, deleting column, moving columns and other schema evolution were not
pursued due to lack of importance and lack of time.  Also, it appears a much more sophisticated
metadata would be needed to support them.
> The biggest issues for users have been adding new columns for ACID table (HIVE-11421
Support Schema evolution for ACID tables) and vectorization (HIVE-10598 Vectorization borks
when column is added to table).

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