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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-15568) Nested column pruning: more optimization on lateral view
Date Mon, 09 Jan 2017 23:15:58 GMT
Chao Sun created HIVE-15568:
-------------------------------

             Summary: Nested column pruning: more optimization on lateral view
                 Key: HIVE-15568
                 URL: https://issues.apache.org/jira/browse/HIVE-15568
             Project: Hive
          Issue Type: Sub-task
          Components: Logical Optimizer
    Affects Versions: 2.2.0
            Reporter: Chao Sun


For queries with lateral view such as:
{code}
SELECT k FROM tbl
LATERAL VIEW EXPLODE(some_map_col) tbl2 AS k, v
{code}
where {{some_map_col}} is some column of map type, we should only need to scan all the keys
for the map. Currently we need to scan both key and values.



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