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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2324) Enhancing local mode execution with non-HDFS related queries
Date Fri, 29 Jul 2011 18:02:10 GMT
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. 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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