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https://issues.apache.org/jira/browse/DRILL-5034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15935204#comment-15935204
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Krystal commented on DRILL-5034:
--------------------------------
Verified that int96 timestamps return correct result for queries against
various user timezones such as UTC, PST, and EST. Tested with alter session
set `store.parquet.reader.int96_as_timestamp`=true/false.
> Select timestamp from hive generated parquet always return in UTC
> -----------------------------------------------------------------
>
> Key: DRILL-5034
> URL: https://issues.apache.org/jira/browse/DRILL-5034
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - Parquet
> Affects Versions: 1.9.0
> Reporter: Krystal
> Assignee: Vitalii Diravka
> Labels: doc-impacting, ready-to-commit
> Fix For: 1.10.0
>
>
> commit id: 5cea9afa6278e21574c6a982ae5c3d82085ef904
> Reading timestamp data against a hive parquet table from drill automatically
> converts the timestamp data to UTC.
> {code}
> SELECT TIMEOFDAY() FROM (VALUES(1));
> +----------------------------------------------+
> | EXPR$0 |
> +----------------------------------------------+
> | 2016-11-10 12:33:26.547 America/Los_Angeles |
> +----------------------------------------------+
> {code}
> data schema:
> {code}
> message hive_schema {
> optional int32 voter_id;
> optional binary name (UTF8);
> optional int32 age;
> optional binary registration (UTF8);
> optional fixed_len_byte_array(3) contributions (DECIMAL(6,2));
> optional int32 voterzone;
> optional int96 create_timestamp;
> optional int32 create_date (DATE);
> }
> {code}
> Using drill-1.8, the returned timestamps match the table data:
> {code}
> select convert_from(create_timestamp, 'TIMESTAMP_IMPALA') from
> `/user/hive/warehouse/voter_hive_parquet` limit 5;
> +------------------------+
> | EXPR$0 |
> +------------------------+
> | 2016-10-23 20:03:58.0 |
> | null |
> | 2016-09-09 12:01:18.0 |
> | 2017-03-06 20:35:55.0 |
> | 2017-01-20 22:32:43.0 |
> +------------------------+
> 5 rows selected (1.032 seconds)
> {code}
> If the user timzone is changed to UTC, then the timestamp data is returned in
> UTC time.
> Using drill-1.9, the returned timestamps got converted to UTC eventhough the
> user timezone is in PST.
> {code}
> select convert_from(create_timestamp, 'TIMESTAMP_IMPALA') from
> dfs.`/user/hive/warehouse/voter_hive_parquet` limit 5;
> +------------------------+
> | EXPR$0 |
> +------------------------+
> | 2016-10-24 03:03:58.0 |
> | null |
> | 2016-09-09 19:01:18.0 |
> | 2017-03-07 04:35:55.0 |
> | 2017-01-21 06:32:43.0 |
> +------------------------+
> {code}
> {code}
> alter session set `store.parquet.reader.int96_as_timestamp`=true;
> +-------+---------------------------------------------------+
> | ok | summary |
> +-------+---------------------------------------------------+
> | true | store.parquet.reader.int96_as_timestamp updated. |
> +-------+---------------------------------------------------+
> select create_timestamp from dfs.`/user/hive/warehouse/voter_hive_parquet`
> limit 5;
> +------------------------+
> | create_timestamp |
> +------------------------+
> | 2016-10-24 03:03:58.0 |
> | null |
> | 2016-09-09 19:01:18.0 |
> | 2017-03-07 04:35:55.0 |
> | 2017-01-21 06:32:43.0 |
> +------------------------+
> {code}
>
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