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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-15056) Parse Unsupported Sampling Syntax and Issue Better Exceptions
Date Mon, 02 May 2016 07:46:12 GMT

     [ https://issues.apache.org/jira/browse/SPARK-15056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-15056:
------------------------------------

    Assignee: Apache Spark

> Parse Unsupported Sampling Syntax and Issue Better Exceptions
> -------------------------------------------------------------
>
>                 Key: SPARK-15056
>                 URL: https://issues.apache.org/jira/browse/SPARK-15056
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Xiao Li
>            Assignee: Apache Spark
>            Priority: Minor
>
> https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Sampling
> Compared with the current Spark parser, there are two extra syntax are supported in Hive
for sampling
> 1. In On clauses, rand() indicating sampling on the entire row instead of an individual
column. 
> 2. Users can specify total length to be read in block_sample.
> We need to parse and capture them. Issue a better error message for these unsupported
features.



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