private SqlExpression FilterHaving(SqlExpression havingExpression, IList <SqlExpression> aggregates, IRequest context)
{
if (havingExpression is SqlBinaryExpression)
{
var binary = (SqlBinaryExpression)havingExpression;
var expType = binary.ExpressionType;
var newLeft = FilterHaving(binary.Left, aggregates, context);
var newRight = FilterHaving(binary.Right, aggregates, context);
return(SqlExpression.Binary(newLeft, expType, newRight));
}
// Not logical so determine if the expression is an aggregate or not
if (havingExpression.HasAggregate(context))
{
// Has aggregate functions so we must WriteByte this expression on the
// aggregate list.
aggregates.Add(havingExpression);
var name = new ObjectName(FunctionTableName, String.Format("HAVINGAGG_{0}", aggregates.Count));
return(SqlExpression.Reference(name));
}
return(havingExpression);
}
private static SqlExpression VisitBinaryExpression(SqlBinaryExpressionNode expressionNode)
{
var left = Build(expressionNode.Left);
var right = Build(expressionNode.Right);
var op = expressionNode.Operator;
var expType = GetBinaryExpressionType(op);
return(SqlExpression.Binary(left, expType, right));
}
public IExpressionBuilder Binary(SqlExpressionType binaryType, Action <IExpressionBuilder> right)
{
if (expression == null)
{
throw new InvalidOperationException();
}
var builder = new ExpressionBuilder();
right(builder);
expression = SqlExpression.Binary(expression, binaryType, builder.Build());
VerifyUnary();
return(this);
}
private static void AddSingleColumnPlan(IList <SingleColumnPlan> list, TablePlan table, ObjectName columnName, ObjectName uniqueName, SqlExpression[] expParts, SqlExpressionType op)
{
var exp = SqlExpression.Binary(expParts[0], op, expParts[1]);
// Is this source in the list already?
foreach (var existingPlan in list)
{
if (existingPlan.TablePlan == table &&
(columnName == null || existingPlan.ColumnName.Equals(columnName)))
{
// Append to end of current expression
existingPlan.SetSource(columnName, SqlExpression.And(existingPlan.Expression, exp));
return;
}
}
// Didn't find so make a new entry in the list.
list.Add(new SingleColumnPlan(table, columnName, uniqueName, exp));
}
