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https://issues.apache.org/jira/browse/HIVE-13312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288866#comment-15288866
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Pau Tallada Crespí commented on HIVE-13312:
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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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