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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-873) Add an option to fail queries if a requested column is not found after some threshold
Date Sun, 04 Jan 2015 23:58:36 GMT

     [ https://issues.apache.org/jira/browse/DRILL-873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jacques Nadeau updated DRILL-873:
---------------------------------
    Fix Version/s:     (was: 0.8.0)
                   0.9.0

> Add an option to fail queries if a requested column is not found after some threshold
> -------------------------------------------------------------------------------------
>
>                 Key: DRILL-873
>                 URL: https://issues.apache.org/jira/browse/DRILL-873
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Metadata
>            Reporter: Steven Phillips
>            Assignee: Aditya Kishore
>            Priority: Minor
>             Fix For: 0.9.0
>
>
> An example where this apply is with json, or hbase when selecting a specific column qualifier.
For these table formats, there is no way to know whether a particular column exists unless
we scan the entire table. So a requested column that does not exist is simply treated as a
column of nulls.
> We should allow an option to fail a query if a requested column is not found after reading
a configurable number of rows. This option will help avoid the case where a mistyped column
name results in a full table scan with unexpected results.



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