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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-4258) Log logical plan tree for debugging
Date Fri, 29 Mar 2013 10:13:15 GMT
Navis created HIVE-4258:
---------------------------

             Summary: Log logical plan tree for debugging
                 Key: HIVE-4258
                 URL: https://issues.apache.org/jira/browse/HIVE-4258
             Project: Hive
          Issue Type: Improvement
          Components: Diagnosability
            Reporter: Navis
            Assignee: Navis
            Priority: Trivial


Debugging or implementing optimizer, knowing the shape of logical plan helps general progress
of it.

For example,
select count(val) from (select a.key as key, b.value as array_val from src a join array_valued_src
b on a.key=b.key) i lateral view explode (array_val) c as val
<noformat>
TS[1]-RS[2]-JOIN[4]-SEL[5]-LVF[6]-SEL[7]-LVJ[10]-SEL[11]-GBY[12]-RS[13]-GBY[14]-SEL[15]-FS[16]
                                 -SEL[8]-UDTF[9]-LVJ[10]
TS[0]-RS[3]-JOIN[4]
<noformat>

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