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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