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From "Matthias J. Sax" <mj...@apache.org>
Subject Re: Effort to add SQL / StreamSQL to Flink
Date Thu, 07 Jan 2016 14:40:45 GMT
Pretty cool!

On 01/07/2016 03:05 PM, Fabian Hueske wrote:
> Hi everybody,
> 
> in the last days, Timo and I refined the design document for adding a SQL /
> StreamSQL interface on top of Flink that was started by Stephan.
> 
> The document proposes an architecture that is centered around Apache
> Calcite. Calcite is an Apache top-level project and includes a SQL parser,
> a semantic validator for relational queries, and a rule- and cost-based
> relational optimizer. Calcite is used by Apache Hive and Apache Drill
> (among other projects). In a nutshell, the plan is to translate Table API
> and SQL queries into Calcite's relational expression trees, optimize these
> trees, and translate them into DataSet and DataStream programs.The document
> breaks down the work into several tasks and subtasks.
> 
> Please review the design document and comment.
> 
> -- >
> https://docs.google.com/document/d/1TLayJNOTBle_-m1rQfgA6Ouj1oYsfqRjPcp1h2TVqdI/edit?usp=sharing
> 
> Unless there are major concerns with the design, Timo and I want to start
> next week to move the current Table API on top of Apache Calcite (Task 1 in
> the document). The goal of this task is to have the same functionality as
> currently, but with Calcite in the translation process. This is a blocking
> task that we hope to complete soon. Afterwards, we can independently work
> on different aspects such as extending the Table API, adding a SQL
> interface (basically just a parser), integration with external data
> sources, better code generation, optimization rules, streaming support for
> the Table API, StreamSQL, etc..
> 
> Timo and I plan to work on a WIP branch to implement Task 1 and merge it to
> the master branch once the task is completed. Of course, everybody is
> welcome to contribute to this effort. Please let us know such that we can
> coordinate our efforts.
> 
> Thanks,
> Fabian
> 


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