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https://issues.apache.org/jira/browse/HIVE-25129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stamatis Zampetakis updated HIVE-25129:
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Attachment: parquet_timestamp_dst.q
> Wrong results when timestamps stored in Avro/Parquet fall into the DST shift
> ----------------------------------------------------------------------------
>
> Key: HIVE-25129
> URL: https://issues.apache.org/jira/browse/HIVE-25129
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Affects Versions: 3.1.0
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
> Attachments: parquet_timestamp_dst.q
>
>
> Timestamp values falling into the daylight savings time of the system
> timezone cannot be retrieved as is when those are stored in Parquet/Avro
> tables. The respective SELECT query shifts those timestamps by +1 reflecting
> the DST shift.
> +Example+
> {code:sql}
> --! qt:timezone:US/Pacific
> create table employee (eid int, birthdate timestamp) stored as parquet;
> insert into employee values (0, '2019-03-10 02:00:00');
> insert into employee values (1, '2020-03-08 02:00:00');
> insert into employee values (2, '2021-03-14 02:00:00');
> select eid, birthdate from employee order by eid;{code}
> +Actual results+
> |0|2019-03-10 03:00:00|
> |1|2020-03-08 03:00:00|
> |2|2021-03-14 03:00:00|
> +Expected results+
> |0|2019-03-10 02:00:00|
> |1|2020-03-08 02:00:00|
> |2|2021-03-14 02:00:00|
> Storing and retrieving values in columns using the [timestamp data
> type|https://cwiki.apache.org/confluence/display/Hive/Different+TIMESTAMP+types]
> (equivalent with LocalDateTime java API) should not alter at any way the
> value that the user is seeing. The results are correct for {{TEXTFILE}} and
> {{ORC}} tables.
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