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https://issues.apache.org/jira/browse/SPARK-15056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Herman van Hovell resolved SPARK-15056.
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Resolution: Fixed
Assignee: Xiao Li
> 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: Xiao Li
> 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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