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https://issues.apache.org/jira/browse/ORC-92?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427728#comment-15427728
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Chunyang Wen commented on ORC-92:
---------------------------------
enum ColumnSelection {
ColumnSelection_NONE = 0,
ColumnSelection_FIELD_NAMES = 1,
ColumnSelection_FIELD_IDS = 2,
ColumnSelection_TYPE_IDS = 3
};
how about TYPE_NAMES ?
in my application, actually we specify columns by column names.
<s1:struct<s2:struct<int1: int>>>
we choose int1 by s1.s2.int1 which will be passed
include(std::list<std:string>).
We can get type id using tools provided by orc c++, but using names sometimes
is a little convenient and more meaningful.
> 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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