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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3180) Apache Drill JDBC storage plugin to query rdbms systems such as MySQL and Netezza from Apache Drill
Date Wed, 16 Sep 2015 16:52:45 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14790721#comment-14790721
] 

Jacques Nadeau commented on DRILL-3180:
---------------------------------------

We made a modification to solve this. As it stands, if the capabilities are in Calcite proper,
we assume that the underlying JDBC source supports the operation. Since CONVERT_FROM is a
Drill specific function, it isn't pushed down. Since Calcite is generally a common subset,
this should be okay in most cases. You can see that code here: https://github.com/apache/drill/blob/master/contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcExpressionCheck.java

Note that we could enhance this so very specific expressions are excluded/included for particular
systems. Our assumption was that initially, this would work for a lot of common use cases.



> Apache Drill JDBC storage plugin to query rdbms systems such as MySQL and Netezza from
Apache Drill
> ---------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-3180
>                 URL: https://issues.apache.org/jira/browse/DRILL-3180
>             Project: Apache Drill
>          Issue Type: New Feature
>          Components: Storage - Other
>    Affects Versions: 1.0.0
>            Reporter: Magnus Pierre
>            Assignee: Jacques Nadeau
>              Labels: Drill, JDBC, plugin
>             Fix For: 1.2.0
>
>         Attachments: patch.diff, pom.xml, storage-mpjdbc.zip
>
>   Original Estimate: 1m
>  Remaining Estimate: 1m
>
> I have developed the base code for a JDBC storage-plugin for Apache Drill. The code is
primitive but consitutes a good starting point for further coding. Today it provides primitive
support for SELECT against RDBMS with JDBC. 
> The goal is to provide complete SELECT support against RDBMS with push down capabilities.
> Currently the code is using standard JDBC classes.



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