System.Data.Common.CommandTrees.DbExpression.IsEmpty()

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protected override CqtExpression TranslateUnary(ExpressionConverter parent, CqtExpression operand,
                    MethodCallExpression call)
                {
                    // "Any" is equivalent to "exists".
                    return operand.IsEmpty().Not();
                }

public override DbExpression Visit(ExistsOp op, Node n)
        {
            //
            // Exists requires a RelOp input set
            //
            DbExpression inputExpr = VisitNode(n.Child0);

            //
            // Information about the Vars published by the RelOp argument does not need to be maintained
            // since they may not now be used higher in the CQT.
            //
            ConsumeRelOp(inputExpr);

            //
            // Exists --> Not(IsEmpty(Input set)) via DbExpressionBuilder.Exists
            //
            return inputExpr.IsEmpty().Not();
        }

private static Dictionary<AST.BuiltInKind, BuiltInExprConverter> CreateBuiltInExprConverter()
/n ..... /n //View Source file for more details /n }