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From Sergio Peña (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HIVE-12767) Implement table property to address Parquet int96 timestamp bug
Date Wed, 22 Feb 2017 17:29:44 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15878798#comment-15878798
] 

Sergio Peña commented on HIVE-12767:
------------------------------------

Great, thanks [~zsombor.klara] for continuing on this work. I just left a couple of comments
on the RB.

> Implement table property to address Parquet int96 timestamp bug
> ---------------------------------------------------------------
>
>                 Key: HIVE-12767
>                 URL: https://issues.apache.org/jira/browse/HIVE-12767
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 1.2.1, 2.0.0
>            Reporter: Sergio Peña
>            Assignee: Barna Zsombor Klara
>         Attachments: HIVE-12767.10.patch, HIVE-12767.3.patch, HIVE-12767.4.patch, HIVE-12767.5.patch,
HIVE-12767.6.patch, HIVE-12767.7.patch, HIVE-12767.8.patch, HIVE-12767.9.patch, TestNanoTimeUtils.java
>
>
> Parque timestamps using INT96 are not compatible with other tools, like Impala, due to
issues in Hive because it adjusts timezones values in a different way than Impala.
> To address such issues. a new table property (parquet.mr.int96.write.zone) must be used
in Hive that detects what timezone to use when writing and reading timestamps from Parquet.
> The following is the exit criteria for the fix:
> * Hive will read Parquet MR int96 timestamp data and adjust values using a time zone
from a table property, if set, or using the local time zone if it is absent. No adjustment
will be applied to data written by Impala.
> * Hive will write Parquet int96 timestamps using a time zone adjustment from the same
table property, if set, or using the local time zone if it is absent. This keeps the data
in the table consistent.
> * New tables created by Hive will set the table property to UTC if the global option
to set the property for new tables is enabled.
> ** Tables created using CREATE TABLE and CREATE TABLE LIKE FILE will not set the property
unless the global setting to do so is enabled.
> ** Tables created using CREATE TABLE LIKE <OTHER TABLE> will copy the property
of the table that is copied.



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