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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-836) Drill needs to return complex types (e.g., map and array) as a JSON string
Date Mon, 16 Jun 2014 21:34:07 GMT

    [ https://issues.apache.org/jira/browse/DRILL-836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14033017#comment-14033017
] 

Jacques Nadeau commented on DRILL-836:
--------------------------------------

merged on or before f86639c

> Drill needs to return complex types (e.g., map and array) as a JSON string
> --------------------------------------------------------------------------
>
>                 Key: DRILL-836
>                 URL: https://issues.apache.org/jira/browse/DRILL-836
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Operators, Execution - RPC
>    Affects Versions: 1.0.0-BETA1
>            Reporter: George Chow
>            Assignee: DrillCommitter
>            Priority: Blocker
>             Fix For: 1.0.0-BETA1
>
>         Attachments: DRILL-836-Drill-needs-to-return-complex-types-e.g.-m.patch, DRILL-836-Drill-needs-to-return-complex-types-e.g.-m.patch
>
>
> Drill needs to help users understand the available columns in a given HBase table's column-family.
One way to do this is to implement the DESCRIBE command for a column-family. The purpose of
this is to let Drill do the column sampling. The mandatory LIMIT clause specifies the sample
size so as to throttle the number of columns returned.
> ==
> Instead of the above narrow proposal, a general mechanism to return complex types in
a JSON string so as to allow client tools (such as the ODBC driver) to operate on these complex
types.
> Returning a map as JSON would provide transparency into HBase column-families and allow
the ODBC driver to help surface the names of columns within a column-family.
> Returning an array as JSON would provide transparency into CSV files since that conveys
the number of columns to the ODBC driver.



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