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Posted to issues@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2015/09/10 07:24:46 UTC

[jira] [Created] (TAJO-1832) Well support for self-describing data formats

Jihoon Son created TAJO-1832:
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             Summary: 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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