Expression types

Expressions are the building blocks of queries and are divided into the following types

• Constant - for constants such as Strings, numbers and entity instances
• ConstantImpl is the main implementation class
• FactoryExpression - for row based result processing
• e.g. QTuple, QBean, ConstructorExpression
• Operation - for common supported operations and function calls
• ParamExpression - for bindable query parameters
• Path - for variables, properties and collection member access
• SubQueryExpression - for subqueries
• TemplateExpression - for custom syntax