private void AddSingleColumn(SubqueryExpression subQuery)
{
if (subQuery.Select !.Columns.Count != 1)
{
throw new InvalidOperationException("Subquery has {0} columns: {1}".FormatWith(subQuery.Select.Columns.Count, subQuery.ToString()));
}
allColumnsUsed.GetOrCreate(subQuery.Select.Alias).Add(subQuery.Select.Columns[0].Name);
}
protected virtual bool CompareSubquery(SubqueryExpression a, SubqueryExpression b)
{
if (a.NodeType != b.NodeType)
{
return(false);
}
switch ((DbExpressionType)a.NodeType)
{
case DbExpressionType.Scalar:
return(CompareScalar((ScalarExpression)a, (ScalarExpression)b));
case DbExpressionType.Exists:
return(CompareExists((ExistsExpression)a, (ExistsExpression)b));
case DbExpressionType.In:
return(CompareIn((InExpression)a, (InExpression)b));
}
return(false);
}
