GitHub user chunyang-wen opened a pull request:
https://github.com/apache/orc/pull/53
add support for nested column id selection, not only first level's id
Currently, orc c++ ReaderOptions only supports first level's id selection.
It is suitable for a flat data structure such as "struct\<int1:int, d1:double,
t1:timestamp, d2:double\>". The column id is: 0(root type), 1(int1), 2(d1),
3(t1), 4(d2). We can choose any combinations of 1,2,3,4.
But if orc file's schema has different levels of nested types, the include
function in ReaderOptions may not work properly. If the schema is
âstruct\<int1:int, s1: struct\<d1:double, t1:timestamp, d2:doulbe\>\>".
We can only select combination of 1(int1), 2(s1). Selecting other column id
will get an exception thrown.
In this patch, nested column id is supported. We can selected any column,
if one column is selected, its path to the root will also be selected in order
to create the reader.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chunyang-wen/orc master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/orc/pull/53.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #53
----
commit 21ca200c35c21c2ea5a8bb8c395b44510343fa88
Author: wenchunyang <[email protected]>
Date: 2016-08-09T08:36:54Z
add support for nested column id selection, not only first level's id
commit bcc91206b8c9f8f84c217112831010fa7e2eb30c
Author: wenchunyang <[email protected]>
Date: 2016-08-09T08:36:54Z
add support for nested column id selection, not only first level's id
commit 67852f2dfdef3f5f238b5b94002d5598b95948fd
Author: wenchunyang <[email protected]>
Date: 2016-08-09T13:56:17Z
Merge branch 'master' of https://github.com/chunyang-wen/orc
commit f257cf822ee406aedb666037e2b065a95bf2e9b9
Author: wenchunyang <[email protected]>
Date: 2016-08-09T14:02:54Z
Resolve confilict
commit f1560ed348837ce6cc63fe69234175c0f9d8e124
Author: wenchunyang <[email protected]>
Date: 2016-08-09T14:05:16Z
Merge https://github.com/apache/orc
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
