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);
}
protected override Expression VisitJoin(JoinExpression join)
{
join = (JoinExpression)base.VisitJoin(join);
if ((join.Join == JoinType.CrossJoin) && (this.currentWhere != null))
{
Func <Expression, bool> predicate = null;
HashSet <TableAlias> declaredLeft = DeclaredAliasGatherer.Gather(join.Left);
HashSet <TableAlias> declaredRight = DeclaredAliasGatherer.Gather(join.Right);
HashSet <TableAlias> declared = new HashSet <TableAlias>(declaredLeft.Union <TableAlias>(declaredRight));
Expression[] source = this.currentWhere.Split(new ExpressionType[] { ExpressionType.And, ExpressionType.AndAlso });
List <Expression> good = (from e in source
where this.CanBeJoinCondition(e, declaredLeft, declaredRight, declared)
select e).ToList <Expression>();
if (good.Count <= 0)
{
return(join);
}
Expression condition = good.Join(ExpressionType.And);
join = base.UpdateJoin(join, JoinType.InnerJoin, join.Left, join.Right, condition);
if (predicate == null)
{
predicate = e => !good.Contains(e);
}
Expression expression2 = source.Where <Expression>(predicate).Join(ExpressionType.And);
this.currentWhere = expression2;
}
return(join);
}
protected override Expression VisitSelect(SelectExpression select)
{
Expression expression;
bool isOuterMostSelect = this.isOuterMostSelect;
try
{
this.isOuterMostSelect = false;
select = (SelectExpression)base.VisitSelect(select);
bool flag2 = (select.OrderBy != null) && (select.OrderBy.Count > 0);
bool flag3 = (select.GroupBy != null) && (select.GroupBy.Count > 0);
bool flag4 = (isOuterMostSelect || (select.Take != null)) || (select.Skip != null);
bool flag5 = ((flag4 && !flag3) && !select.IsDistinct) && !AggregateChecker.HasAggregates(select);
if (flag2)
{
this.PrependOrderings(select.OrderBy);
}
if (select.IsReverse)
{
this.ReverseOrderings();
}
IEnumerable <OrderExpression> orderBy = null;
if (flag5)
{
orderBy = this.gatheredOrderings;
}
else if (flag4)
{
orderBy = select.OrderBy;
}
bool flag6 = (!isOuterMostSelect && !flag3) && !select.IsDistinct;
ReadOnlyCollection <ColumnDeclaration> columns = select.Columns;
if (this.gatheredOrderings != null)
{
if (flag6)
{
HashSet <TableAlias> existingAliases = DeclaredAliasGatherer.Gather(select.From);
BindResult result = this.RebindOrderings(this.gatheredOrderings, select.Alias, existingAliases, select.Columns);
this.gatheredOrderings = null;
this.PrependOrderings(result.Orderings);
columns = result.Columns;
}
else
{
this.gatheredOrderings = null;
}
}
if (((orderBy != select.OrderBy) || (columns != select.Columns)) || select.IsReverse)
{
select = new SelectExpression(select.Alias, columns, select.From, select.Where, orderBy, select.GroupBy, select.IsDistinct, select.Skip, select.Take, false);
}
expression = select;
}
finally
{
this.isOuterMostSelect = isOuterMostSelect;
}
return(expression);
}
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?)));
}
