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From "Reynold Xin (JIRA)" <>
Subject [jira] [Commented] (SPARK-5472) Add support for reading from and writing to a JDBC database
Date Tue, 03 Feb 2015 20:39:35 GMT


Reynold Xin commented on SPARK-5472:

What if we expand the JDBC data source to support arbitrary queries?

> Add support for reading from and writing to a JDBC database
> -----------------------------------------------------------
>                 Key: SPARK-5472
>                 URL:
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Tor Myklebust
>            Assignee: Tor Myklebust
>            Priority: Blocker
>             Fix For: 1.3.0
> It would be nice to be able to make a table in a JDBC database appear as a table in Spark
SQL.  This would let users, for instance, perform a JOIN between a DataFrame in Spark SQL
with a table in a Postgres database.
> It might also be nice to be able to go the other direction -- save a DataFrame to a database
-- for instance in an ETL job.
> Edited to clarify:  Both of these tasks are certainly possible to accomplish at the moment
with a little bit of ad-hoc glue code.  However, there is no fundamental reason why the user
should need to supply the table schema and some code for pulling data out of a ResultSet row
into a Catalyst Row structure when this information can be derived from the schema of the
database table itself.

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