public override Expression VisitSelectClause(SelectClauseExpression selectClauseExpression)
{
base.VisitSelectClause(selectClauseExpression);
string translation;
switch ((CqlExpressionType)selectClauseExpression.NodeType)
{
case CqlExpressionType.SelectAll:
translation = "*";
break;
case CqlExpressionType.SelectCount:
translation = "COUNT(*)";
break;
case CqlExpressionType.SelectColumns:
translation = selectClauseExpression.Distinct ? "DISTINCT " : "";
var selectors = selectClauseExpression.Selectors.Select(arg => _translations[arg]);
translation += string.Join(",", selectors);
break;
default:
throw new Exception("Unexpected type of select clause encountered : " +
selectClauseExpression.NodeType);
}
_translations[selectClauseExpression] = translation;
return selectClauseExpression;
}
public SelectStatementExpression(Type type, SelectClauseExpression selectClause, string tableName,
IList<RelationExpression> whereClause, IList<OrderingExpression> orderBy,
int? limit, bool allowFiltering)
{
if (type == null)
throw new ArgumentNullException("type");
if (selectClause == null)
throw new ArgumentNullException("selectClause");
if (tableName == null)
throw new ArgumentNullException("tableName");
_type = type;
_selectClause = selectClause;
_tableName = tableName;
_whereClause = whereClause.AsReadOnly();
_orderBy = orderBy.AsReadOnly();
_limit = limit;
_allowFiltering = allowFiltering;
}
/// <summary>
/// Visits the select clause.
/// </summary>
/// <param name="selectClauseExpression"> The select clause expression. </param>
/// <returns> </returns>
public virtual Expression VisitSelectClause(SelectClauseExpression selectClauseExpression)
{
return base.VisitExtension(selectClauseExpression);
}