||This class is used to generate DQL expressions via a set of PHP static functions
||Scans a DQL query for tokens.
||An LL(*) recursive-descent parser for the context-free grammar of the Doctrine
Query Language. Parses a DQL query, reports any errors in it, and generates an
||Encapsulates the resulting components from a DQL query parsing process that can
||A parse tree printer for Doctrine Query Language parser.
||A ResultSetMapping describes how a result set of an SQL query maps to a Doctrine
||The SqlWalker is a TreeWalker that walks over a DQL AST and constructs the
||An adapter implementation of the TreeWalker interface. The methods in this class
are empty. This class exists as convenience for creating tree walkers.
||Represents a chain of tree walkers that modify an AST and finally emit output.
Only the last walker in the chain can emit output. Any previous walkers can
modify the AST to influence the final output produced by the last walker.