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From "Ashish Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ORC-323) Predicate push down for nested fields
Date Fri, 16 Mar 2018 12:21:00 GMT
Ashish Sharma created ORC-323:
---------------------------------

             Summary: Predicate push down for nested fields
                 Key: ORC-323
                 URL: https://issues.apache.org/jira/browse/ORC-323
             Project: ORC
          Issue Type: Improvement
            Reporter: Ashish Sharma


ORC supports predicate pushdown (block skipping) for ORC hive tables only on top-level fields.

struct<int1:int,string1:string>

ORC should also support block skipping on nested fields (within structs).
struct<int1:int,complex:struct<int2:int,String1:string>>

Advantage of having predicate pushdown in nested filed will allow ORC to skip blocks while
having comparison at nested fields level. Skipping block will result in reduction of physical
memory and compute.



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