SQL on NoSQL

Overview

This project is inpired by solrflux, which can interact to solr with SQL-like syntax.

What have I done?

This project is based-on solrflux, and I refactored it, I want extract it as an abstract layer to access some NoSQL db, such as Solr or HBase.

I extract three main components in SQL execute phrase:

• sql parse phrase
• semantic analyze phrase
• plan execute phrase

Everyone who wants add SQL-like syntax to a specific db, you can implement your own Planner by extend some Planner class, such as SelectPlanner, InsertPlanner or DeletePlanner. This project provides an execution plan implementaion of Solr. go to

How to use?

Run(Console):

use 'solr_url' as table; // use 'http://localhost:8983/solr' as test;
enter your sql;          // select * from test;

If you are running this by some IDE (IntelliJ or Eclipse), you should add a VM options below to make it work:

-Djline.terminal=jline.UnsupportedTerminal

BTW, this project noly support solr 3.5 currently, if you want, you can make it support solr 4.x. ;)

What next?

It is very hard and complicated to write your own ANTLR template, I just add some aggregate functions to solrflux template to support SQL like select MAX(field) from table;. Do this is time-consuming and unnecessary, why not use some open source SQL-parser module? Like FoundationDB SQL Parser.

Next time I will extract SQL parse phrase, extract ASTNode just like Hive did, so we can free our mind from the Lexer and Parser.

For more information, you can send email to me: hongweiyi#hotmail.com or me#hongweiyi.com. ;)