
Piece = query expression part

Query expressions language identification
   1. Specific language patterns identification (VB string compare)
--> ExpressionLanguageParser
   2. Constant reduction 
--> ExpressionOptimizer

# Query expressions query identification
--> ExpressionDispatcher

   1. Key methods (where, select...) identification and inner expressions dispatching (top-level method is handled specifically)
   2. Non-operation expressions deduction
          * Table (--> TableExpression)
          * Column (--> ColumnExpression)
          * Input parameter (--> ParameterExpression)
          * Meta-table (a class containing table aliases) (--> MetaTableExpression)
          
--> DataMapper
--> ExpressionQuery
--> ExpressionRegistrar // no other idea at the moment

Generate SQL (Sugar + Database IVendor) 
--> Query
