[OSM-dev] about Carto and SQL

[sav123]

Hello,

Is there a documentation of the Carto sql mechanism ?

In fact, I should want only to know :

1) if all the SQL requests required to produce a map are in the style file 
or else if there are other SQL requests not if in this file ( and where they 
are ).

2) how work variables like pixel_width and how they are passed to postgresql


I hope to be able to grab enough information to partition some or all the 
postgresql tables and to publish the resulting comparison boards.

I know that it is possible to setup logs and to check them, but this method 
may miss rare calls ...

thank you

Igael