DDL Execution Architecture

Adriano posted about DDL execution artchitecture, its flaws and new improvements for FB 3.

Here I’m going to explain how Firebird DDL commands works in the architecture, why it stops innovation and how it is supposed to work in Firebird 3.0.

DDL in FB works more or less like DML, so first a briefly explanation of how DML works. When a DML command is prepared, it starts in the parser constructing a tree of nodes. That nodes are all a single pointer type, used for all node types and others usages (like storing constants). A node have a list of child nodes.

Real full post here.