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https://issues.apache.org/jira/browse/TAJO-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741997#comment-14741997
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ASF GitHub Bot commented on TAJO-1832:
--------------------------------------
GitHub user jihoonson opened a pull request:
https://github.com/apache/tajo/pull/756
TAJO-1832: Well support for self-describing data formats
This is still on-going work, but mostly finished.
Honestly, I think it will be finished if I improve unit tests and cleanup
some code lines.
Before finishing it, I'd like to share my approach for this issue.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jihoonson/tajo-2 TAJO-1832
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/756.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 #756
----
commit 2445c7d6c4d5b6cead7db09936d08945da043acf
Author: Jihoon Son <[email protected]>
Date: 2015-09-10T07:54:07Z
TAJO-1833
commit 9b978900eade3d6d71f9a47c405b0eab4cdb275a
Author: Jihoon Son <[email protected]>
Date: 2015-09-10T08:30:19Z
Change to abstract class
commit 11c089f0a0c71f1cb60ab2dbb71e7769d42ff6bc
Author: Jihoon Son <[email protected]>
Date: 2015-09-10T09:26:44Z
TAJO-1832
commit 67497269c4e248dd4430bdbf745c91e6078412dd
Author: Jihoon Son <[email protected]>
Date: 2015-09-10T12:58:51Z
TAJO-1832
commit 01b4d92df72171437cf8cf5ee96394112d88169d
Author: Jihoon Son <[email protected]>
Date: 2015-09-10T14:36:29Z
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into
TAJO-1832
commit d0be6b31cd8c3747c0b186ea35d69c6dbebe0c34
Author: Jihoon Son <[email protected]>
Date: 2015-09-11T17:30:38Z
TAJO-1832
commit 9b58e686b207f47c645be5f519671511af84dd24
Author: Jihoon Son <[email protected]>
Date: 2015-09-12T06:13:12Z
fix groupby
commit af8a8e4abcce248359dd95e2e06ee1b926becd92
Author: Jihoon Son <[email protected]>
Date: 2015-09-12T06:50:10Z
add license
commit 471a70a5e628023509c5eb867660714b5e61a388
Author: Jihoon Son <[email protected]>
Date: 2015-09-12T09:37:59Z
Finished, but need to improve test
commit 4f5ac455d21c7a9bfc13280a60cc3354010c9145
Author: Jihoon Son <[email protected]>
Date: 2015-09-12T09:43:32Z
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into
TAJO-1832
----
> Well support for self-describing data formats
> ---------------------------------------------
>
> Key: TAJO-1832
> URL: https://issues.apache.org/jira/browse/TAJO-1832
> Project: Tajo
> Issue Type: New Feature
> Components: Planner/Optimizer
> Reporter: Jihoon Son
> Assignee: Jihoon Son
>
> *Problem*
> Tajo already has a support for self-describing data formats like JSON,
> Parquet, or ORC. While they are capable of providing schema information by
> themselves, users must define schema to query on them with the current
> implementation. To solve this inconvenience, we have to improve our query
> planner to support self-describing data formats well.
> *Solution*
> First, we need to allow omitting schema definition for the create table
> statement. When a query is submitted for a self-describing table, the columns
> which don't exist in that table will be filled with Nulls.
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