extending queries with (php_) mapscript

[Paul Spencer]

Hi devs,

I would like to be able to do some slightly fancier stuff with  
queries than is currently possible using mapscript.  Specifically,  
I'd like to be able to extend an existing selection and optionally  
toggle shapes in the result set.

I was hoping that simply loading a previously saved query and then  
querying would do the 'extend' part but it seems queries flush  
existing results.

I think what would solve my problem would be to call addResult from  
(php_) mapscript.  Then I could:

* load the saved query
* get the indexes of the existing results
* flush all results
* run the new queries
* get the indexes of the new results and merge them with the existing  
results
* flush the results
* run through the lot and add the results back
* save the query

I believe that mapquery.c has the appropriate addResult function so  
this would be a matter of exposing it in (php_) mapscript and adding  
the appropriate documentation.

Would this require an RFC?  Could we get it in for 5.0?  Should I be  
considering another approach?

Cheers

Paul

+-----------------------------------------------------------------+
|Paul Spencer                          pspencer at dmsolutions.ca    |
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|Chief Technology Officer                                         |
|DM Solutions Group Inc                http://www.dmsolutions.ca/ |
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