protected override Expression VisitBinary(BinaryExpression b)
{
Visit(b.Left);
var left = _state.ResultStack.Pop();
Visit(b.Right);
var right = _state.ResultStack.Pop();
var dbOptr = _dbFactory.GetDbOperator(b.NodeType, b.Left.Type, b.Right.Type);
if (left.IsNullVal() || right.IsNullVal())
{
dbOptr = dbOptr == DbOperator.Equal
? DbOperator.Is
: dbOptr == DbOperator.NotEqual
? DbOperator.IsNot
: dbOptr;
}
var dbBinary = _dbFactory.BuildBinary(left, dbOptr, right);
if (dbOptr == DbOperator.Or)
{
var dbRefs = dbBinary.GetOperands().OfType <IDbSelectable>().Select(s => s.Ref);
foreach (var dbRef in dbRefs)
{
SqlTranslationHelper.UpdateJoinType(dbRef);
}
}
_state.ResultStack.Push(dbBinary);
return(b);
}