[jira] [Reopened] (ORC-92) Support column id and column name selection in ReaderOptions

["Chunyang Wen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ORC-92?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chunyang Wen reopened ORC-92:
-----------------------------

omalley, I think you implementation has some problem.

1. includeTypes does Not select sub-types
2. selectParents may stop early, so that some sub-types may not be selected when building columnvector.

e.g.
{code:c}
<a(0):int, 
  b(1):double,
  c(2):struct<
         c20(3):int,
         c21(4):doulbe
         c22(5):struct<
             d0(6):int,
             d1(7):double>>>
{code}

number after field name is its column id.

if we select type: 2,3,7, then 5 is not selected. It is wrong.

> Support column id and column name selection in ReaderOptions
> ------------------------------------------------------------
>
>                 Key: ORC-92
>                 URL: https://issues.apache.org/jira/browse/ORC-92
>             Project: Orc
>          Issue Type: New Feature
>          Components: C++
>    Affects Versions: 1.2.0
>            Reporter: Chunyang Wen
>            Assignee: Chunyang Wen
>            Priority: Minor
>             Fix For: 1.2.0
>
>
> Currently, in C++ version of orc. We can only select by filed id or field name. This works fine when data structure is flat such as struct<int1:int, s1:string, list1:array<int>>. But when we have a nested structure, struct<int1:int, struct1:struct<int2:int, long2:long>>. We still can only select the field of int1 and struct1. We can not directly select long2.
> We can select long2 by its column id. This can be achieved by updating include function in ReaderOptions. 



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