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Posted to issues@hive.apache.org by "Pau Tallada Crespí (JIRA)" <ji...@apache.org> on 2016/05/18 12:13:12 UTC

[jira] [Commented] (HIVE-13312) TABLESAMPLE with PERCENT throws FAILED: SemanticException 1:68 Percentage sampling is not supported in org.apache.hadoop.hive.ql.io.HiveInputFormat. Error encountered near token '20'

    [ https://issues.apache.org/jira/browse/HIVE-13312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288866#comment-15288866 ] 

Pau Tallada Crespí commented on HIVE-13312:
-------------------------------------------

Also, even with the workaround, an aggregated query reads and processes all rows.
So, a count(*) on a tablesample returns the actual number of rows in the entire table :(

> TABLESAMPLE with PERCENT throws FAILED: SemanticException 1:68 Percentage sampling is not supported in org.apache.hadoop.hive.ql.io.HiveInputFormat. Error encountered near token '20'
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-13312
>                 URL: https://issues.apache.org/jira/browse/HIVE-13312
>             Project: Hive
>          Issue Type: Bug
>          Components: CLI
>    Affects Versions: 1.2.1
>            Reporter: Artem Ervits
>            Priority: Minor
>
> FAILED: SemanticException 1:68 Percentage sampling is not supported in org.apache.hadoop.hive.ql.io.HiveInputFormat. Error encountered near token '20'
> when I execute
> SELECT * FROM tablename TABLESAMPLE(20 percent);
> tried with ORC and TEXT tables. Confirmed with Gopal, a temporary workaround is
> set hive.tez.input.format=${hive.input.format};



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