public override Statement EmitStatement(EmitMode mode)
{
QuotaExpression expression = new QuotaExpression();
expression.Expression = (Expression)Nodes[0].Nodes[0].EmitStatement(mode);
expression.Quota = (Expression)Nodes[1].EmitStatement(mode);
expression.HasByClause = true;
for (int index = 0; index < QuotaOrder.Columns.Count; index++)
{
expression.Columns.Add(QuotaOrder.Columns[index].EmitStatement(mode));
}
expression.Modifiers = Modifiers;
return(expression);
}
private void EnsureValidateNode(Plan plan)
{
if (_validateNode == null)
{
plan.Symbols.Push(new Symbol("ARow", TableVar.DataType.RowType));
try
{
// ARow in (((table { ARow }) union <source expression>) <quota clause>)
QuotaExpression quotaExpression = (QuotaExpression)EmitStatement(EmitMode.ForCopy);
quotaExpression.Expression = new UnionExpression(new TableSelectorExpression(new Expression[] { new IdentifierExpression("ARow") }), quotaExpression.Expression);
Expression validateExpression = new BinaryExpression(new IdentifierExpression("ARow"), Instructions.In, quotaExpression);
_validateNode = Compiler.Compile(plan, validateExpression).ExtractNode <ExpressionStatementNode>().Nodes[0];
}
finally
{
plan.Symbols.Pop();
}
}
}
