Specific expression handler which detects all instances which will be forced to become a query but aren't defined as such. The elements which fall into this category are moved where/orderby clauses which are locked in place and which are the element of a join side without a projection. This means that when they're handled, they'll be converted to a query, which then enforces a scope, however this scope is unknown to the rest of the system and the AliasScoper, so aliases wrapped into this scope are seen as part of the outer scope and the resulting query will fail. This class is used in the alias scoper after join trees have been rewritten by extracting where / order by clauses. This visitor flags when it's in a join side and from then on will set RequiresProjection to true for all where/orderby expressions. When it sees an expression with RequiresProjection set to true, it will stop correcting till it again is in a join side.

public class RequiredProjectionCorrector : GenericExpressionHandler

Public Class RequiredProjectionCorrector
	Inherits GenericExpressionHandler