Variable

A user-defined variable, for example: @ID.

Methods
int	getCost()
int	getCost()
int	getDisplaySize()
int	getDisplaySize()
String	getName()
String	getName()
long	getPrecision()
long	getPrecision()
String	getSQL()
String	getSQL()
int	getScale()
int	getScale()
int	getType()
int	getType()
Value	getValue(Session session)
Value	getValue(Session session)
boolean	isEverything(ExpressionVisitor visitor)
boolean	isEverything(ExpressionVisitor visitor)
void	mapColumns(ColumnResolver resolver, int level)
void	mapColumns(ColumnResolver resolver, int level)
Expression	optimize(Session session)
Expression	optimize(Session session)
void	setEvaluatable(TableFilter tableFilter, boolean value)
void	setEvaluatable(TableFilter tableFilter, boolean value)
void	updateAggregate(Session session)
void	updateAggregate(Session session)