/// <summary>
/// Do all query translations execpt building the execution plan
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
protected virtual ProjectionExpression Translate(Expression expression)
{
// pre-evaluate local sub-trees
expression = PartialEvaluator.Eval(expression, CanBeEvaluatedLocally);
// apply mapping (binds LINQ operators too)
expression = mapping.Translate(expression);
// any policy specific translations or validations
expression = policy.Translate(expression);
// any language specific translations or validations
expression = language.Translate(expression);
// do final reduction
expression = UnusedColumnRemover.Remove(expression);
expression = RedundantSubqueryRemover.Remove(expression);
expression = RedundantJoinRemover.Remove(expression);
expression = RedundantColumnRemover.Remove(expression);
//HACK: Have to fix invalid COUNT/ORDER BY here
expression = CountOrderByRemover.Remove(expression);
return((ProjectionExpression)expression);
}
