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XML storage engine based on VTD-XML
Posted by: Ueberbach JP
Date: December 12, 2011 04:35AM

Hello,

I am thinking about writing an mysql storage engine based on VTD-XML, which is a fast XML indexing technique. While i am brainstorming about this, i want to know if it is possible to custom define a where clause/definition within a storage engine cq extend sql language through storage engines.

In example; can i get the following query to work by only programming a storage engine and putting definitions in there:

SELECT CatalogDescriptionXMLType.query('
/ProductDescription/Summary
') as Result
FROM ProductModels
WHERE CatalogDescriptionXMLType.exist ('/ProductDescription/Features') = 1

CatalogDescriptionXMLType is a column of the custom datatype 'XMLType'.
Exist is a method of the class XMLType ( i need the field, method, together with its parameters, being pushed to the storage engine )

I did not do any research (yet) on mysql storage engine, so i thought lets ask.

So basically my question is; is it possible to customize sql language, using only storage engine code. If no, what are alternatives, udf combined with storage engine? What do i need to do to support a type 'XMLType', do i need to modify the mysql source itself ( something i have done in the past ).

When it is possible using only storage engine + opt. udf, i probably can make it happen in a fairly short notice.

I love mysqld but when it comes to indexing 10.000.000 XML records, it just does not shine without a lot of work.

Cheers

Admin mercuriusgids

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