[jira] [Created] (HIVE-15507) Nested column pruning: fix issue when selecting struct field from array/map element

["Chao Sun (JIRA)" <ji...@apache.org>]

Chao Sun created HIVE-15507:
-------------------------------

             Summary: Nested column pruning: fix issue when selecting struct field from array/map element
                 Key: HIVE-15507
                 URL: https://issues.apache.org/jira/browse/HIVE-15507
             Project: Hive
          Issue Type: Sub-task
    Affects Versions: 2.2.0
            Reporter: Chao Sun
            Assignee: Chao Sun


When running the following query:
{code}
SELECT count(col), arr[0].f
FROM tbl
GROUP BY arr[0].f
{code}

where {{arr}} is an array of struct with field {{f}}. Nested column pruning will fail. This is because we currently process {{GenericUDFIndex}} in the same way as any other UDF. In this case, it will generate path {{arr.f}}, which will not match the struct type info when doing the pruning.
Same thing for map.




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