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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/06/04 18:37:00 UTC
[jira] [Work logged] (HIVE-25104) Backward incompatible timestamp
serialization in Parquet for certain timezones
[ https://issues.apache.org/jira/browse/HIVE-25104?focusedWorklogId=607240&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-607240 ]
ASF GitHub Bot logged work on HIVE-25104:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Jun/21 18:36
Start Date: 04/Jun/21 18:36
Worklog Time Spent: 10m
Work Description: jcamachor merged pull request #2282:
URL: https://github.com/apache/hive/pull/2282
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Issue Time Tracking
-------------------
Worklog Id: (was: 607240)
Time Spent: 2h (was: 1h 50m)
> Backward incompatible timestamp serialization in Parquet for certain timezones
> ------------------------------------------------------------------------------
>
> Key: HIVE-25104
> URL: https://issues.apache.org/jira/browse/HIVE-25104
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Affects Versions: 3.1.0
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h
> Remaining Estimate: 0h
>
> HIVE-12192, HIVE-20007 changed the way that timestamp computations are performed and to some extend how timestamps are serialized and deserialized in files (Parquet, Avro, Orc).
> In versions that include HIVE-12192 or HIVE-20007 the serialization in Parquet files is not backwards compatible. In other words writing timestamps with a version of Hive that includes HIVE-12192/HIVE-20007 and reading them with another (not including the previous issues) may lead to different results depending on the default timezone of the system.
> Consider the following scenario where the default system timezone is set to US/Pacific.
> At apache/master commit 37f13b02dff94e310d77febd60f93d5a205254d3
> {code:sql}
> CREATE EXTERNAL TABLE employee(eid INT,birth timestamp) STORED AS PARQUET
> LOCATION '/tmp/hiveexttbl/employee';
> INSERT INTO employee VALUES (1, '1880-01-01 00:00:00');
> INSERT INTO employee VALUES (2, '1884-01-01 00:00:00');
> INSERT INTO employee VALUES (3, '1990-01-01 00:00:00');
> SELECT * FROM employee;
> {code}
> |1|1880-01-01 00:00:00|
> |2|1884-01-01 00:00:00|
> |3|1990-01-01 00:00:00|
> At apache/branch-2.3 commit 324f9faf12d4b91a9359391810cb3312c004d356
> {code:sql}
> CREATE EXTERNAL TABLE employee(eid INT,birth timestamp) STORED AS PARQUET
> LOCATION '/tmp/hiveexttbl/employee';
> SELECT * FROM employee;
> {code}
> |1|1879-12-31 23:52:58|
> |2|1884-01-01 00:00:00|
> |3|1990-01-01 00:00:00|
> The timestamp for {{eid=1}} in branch-2.3 is different from the one in master.
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