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https://issues.apache.org/jira/browse/DRILL-1524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14194299#comment-14194299
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Mehant Baid commented on DRILL-1524:
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+1, looks good.
> Data from hive parquet table is displayed as "null" when select all columns
> ----------------------------------------------------------------------------
>
> Key: DRILL-1524
> URL: https://issues.apache.org/jira/browse/DRILL-1524
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 0.6.0
> Reporter: Krystal
> Assignee: Venki Korukanti
> Attachments:
> 0003-DRILL-1524-Fix-Hive-Parquet-SerDe-reading-issue-when.patch
>
>
> git.commit.id.abbrev=42f0a7e
> From hive-13, I created a parquet table:
> hive> create table voter_parquet(voter_id int,name string,age tinyint,
> registration string,contributions float,voterzone smallint,create_time
> string) stored as parquet;
> hive> insert overwrite table voter_parquet select * from voter;
> I can select against this table from hive:
> hive> select * from voter_parquet limit 5;
> OK
> 1 nick miller 68 green 717.12 13809 2014-05-25 03:41:54
> 2 ulysses white 48 green 840.06 19451 2014-07-30 08:03:11
> 3 holly garcia 18 democrat 128.2 8750 2014-09-15
> 02:33:11
> 4 victor thompson 61 independent 721.6 20462 2014-06-17
> 13:04:09
> 5 luke allen 39 socialist 800.22 25151 2015-02-01
> 02:02:37
> I ran the same select from sqlline and got all nulls:
> 0: jdbc:drill:schema=hive> select * from voter_parquet limit 5;
> +------------+------------+------------+--------------+---------------+------------+-------------+
> | voter_id | name | age | registration | contributions |
> voterzone | create_time |
> +------------+------------+------------+--------------+---------------+------------+-------------+
> | null | null | null | null | null | null
> | null |
> | null | null | null | null | null | null
> | null |
> | null | null | null | null | null | null
> | null |
> | null | null | null | null | null | null
> | null |
> | null | null | null | null | null | null
> | null |
> +------------+------------+------------+--------------+---------------+------------+-------------+
> Same if I explicitly specify all the columns:
> 0: jdbc:drill:schema=hive> select voter_id, name, age, registration,
> contributions, voterzone, create_time from voter_parquet limit 2;
> +------------+------------+------------+--------------+---------------+------------+-------------+
> | voter_id | name | age | registration | contributions |
> voterzone | create_time |
> +------------+------------+------------+--------------+---------------+------------+-------------+
> | null | null | null | null | null | null
> | null |
> | null | null | null | null | null | null
> | null |
> +------------+------------+------------+--------------+---------------+------------+-------------+
> However, if I select a few columns, then the data displays correctly:
> 0: jdbc:drill:schema=hive> select voter_id, name, age, registration from
> voter_parquet limit 5;
> +------------+------------+------------+--------------+
> | voter_id | name | age | registration |
> +------------+------------+------------+--------------+
> | 1 | nick miller | 68 | green |
> | 2 | ulysses white | 48 | green |
> | 3 | holly garcia | 18 | democrat |
> | 4 | victor thompson | 61 | independent |
> | 5 | luke allen | 39 | socialist |
> +------------+------------+------------+--------------+
> 0: jdbc:drill:schema=hive> describe voter_parquet;
> +-------------+------------+-------------+
> | COLUMN_NAME | DATA_TYPE | IS_NULLABLE |
> +-------------+------------+-------------+
> | voter_id | INTEGER | YES |
> | name | VARCHAR | YES |
> | age | TINYINT | YES |
> | registration | VARCHAR | YES |
> | contributions | FLOAT | YES |
> | voterzone | SMALLINT | YES |
> | create_time | VARCHAR | YES |
> +-------------+------------+-------------+
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