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https://issues.apache.org/jira/browse/HIVE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072970#comment-13072970
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John Sichi commented on HIVE-2324:
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Currently the HBase handler returns 0 from its splits' getLength(), because
that's what the underlying HBase TableSplit implementation does, so it's in
this category too.
> Enhancing local mode execution with non-HDFS related queries
> -------------------------------------------------------------
>
> Key: HIVE-2324
> URL: https://issues.apache.org/jira/browse/HIVE-2324
> Project: Hive
> Issue Type: New Feature
> Reporter: Ning Zhang
>
> Local mode execution are decided based on the input size. There are queries
> that do not involve data resides in HDFS at all. We should enhance local mode
> execution with these types of queries:
> 1) metadata only queries (HIVE-178, HIVE-1003). eg.,
> {code}
> SELECT max(ds) From T WHERE ts = 'some_partition'; -- both ds and ts are
> partition columns
> {code}
> 2) DUAL table (HIVE-1558):
> {code}
> SELECT MYUDF('constant1', 'constant2') FROM DUAL;
> SELECT MYUDAF(...) FROM ( SELECT 'const1' col1, 'const2' col2 FROM DUAL ) A
> GROUP BY col1;
> {code}
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