Jihoon Son created TAJO-2011:
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Summary: Limitedly allow to retrieve all columns from schemaless
tables
Key: TAJO-2011
URL: https://issues.apache.org/jira/browse/TAJO-2011
Project: Tajo
Issue Type: New Feature
Reporter: Jihoon Son
Assignee: Jihoon Son
Fix For: 0.11.1
Schemaless table allows to easily create tables for json data. However, it is
difficult to get any schema information or sample data because tajo doesn't
allow to retrieve all columns from schemaless tables. The reason why tajo
doesn't support it is, it is impossible to get the entire schema before
retrieving whole data. So, it is very difficult to consistently print the final
result.
IMO, it will be useful for uses even if tajo allows to do it limitedly. To
prevent from using too much memory, retrieving all columns needs to be allowed
only when it is used with LIMIT clause together.
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