private void MapAliases(Expression a, Expression b)
{
TableAlias[] aliasArray = DeclaredAliasGatherer.Gather(a).ToArray <TableAlias>();
TableAlias[] aliasArray2 = DeclaredAliasGatherer.Gather(b).ToArray <TableAlias>();
int index = 0;
int length = aliasArray.Length;
while (index < length)
{
this.aliasScope.Add(aliasArray[index], aliasArray2[index]);
index++;
}
}
private Expression MakeSubquery(Expression expression)
{
TableAlias alias = new TableAlias();
HashSet <TableAlias> set = DeclaredAliasGatherer.Gather(expression);
List <ColumnDeclaration> columns = new List <ColumnDeclaration>();
foreach (TableAlias alias2 in set)
{
foreach (ColumnExpression expression2 in this.columns[alias2])
{
ColumnDeclaration item = new ColumnDeclaration(columns.GetAvailableColumnName(expression2.Name), expression2, expression2.QueryType);
columns.Add(item);
ColumnExpression expression3 = new ColumnExpression(expression2.Type, expression2.QueryType, alias, expression2.Name);
this.map.Add(expression2, expression3);
}
}
return(new SelectExpression(alias, columns, expression, null));
}
public virtual Expression GetOuterJoinTest(SelectExpression select)
{
List <ColumnExpression> list = JoinColumnGatherer.Gather(DeclaredAliasGatherer.Gather(select.From), select).ToList <ColumnExpression>();
if (list.Count > 0)
{
foreach (ColumnExpression expression in list)
{
foreach (ColumnDeclaration declaration in select.Columns)
{
if (expression.Equals(declaration.Expression))
{
return(expression);
}
}
}
return(list[0]);
}
return(Expression.Constant(1, typeof(int?)));
}
protected override Expression VisitJoin(JoinExpression join)
{
join = (JoinExpression)base.VisitJoin(join);
if ((join.Join == JoinType.CrossApply) || (join.Join == JoinType.OuterApply))
{
if (join.Right is TableExpression)
{
return(new JoinExpression(JoinType.CrossJoin, join.Left, join.Right, null));
}
SelectExpression right = join.Right as SelectExpression;
if ((((right != null) && (right.Take == null)) && ((right.Skip == null) && !AggregateChecker.HasAggregates(right))) && ((right.GroupBy == null) || (right.GroupBy.Count == 0)))
{
SelectExpression source = right.SetWhere(null);
HashSet <TableAlias> set = ReferencedAliasGatherer.Gather(source);
HashSet <TableAlias> other = DeclaredAliasGatherer.Gather(join.Left);
set.IntersectWith(other);
if (set.Count == 0)
{
Expression where = right.Where;
right = source;
ProjectedColumns columns = ColumnProjector.ProjectColumns(this.language, where, right.Columns, right.Alias, DeclaredAliasGatherer.Gather(right.From));
right = right.SetColumns(columns.Columns);
where = columns.Projector;
return(new JoinExpression((where == null) ? JoinType.CrossJoin : ((join.Join == JoinType.CrossApply) ? JoinType.InnerJoin : JoinType.LeftOuter), join.Left, right, where));
}
}
}
return(join);
}
