public void OuterJoinLogicalRewriter_DoubleFieldKey()
{
// NOTE: some parameter names are hard coded into the optimizer
TestDatabase db = new TestDatabase();
Expression expression = CreateExpression(() =>
db.Members.SelectMany(m =>
db.Groups
.Where(g => g.Id == m.GroupId && m.GroupId2 == g.Id2)
.DefaultIfEmpty(),
(m, g) => new { Member = m, Group = g }));
Expression expectedExpression = CreateExpression(() =>
db.Members.GroupJoin(
db.Groups,
outer => new Tuple <int?, int>(outer.GroupId, outer.GroupId2),
inner => new Tuple <int?, int>(inner.Id, inner.Id2),
(outer, inner) => JoinGroup.Create(outer, inner))
.SelectMany(
group => group.Inner.DefaultIfEmpty(),
(group, inner) => new { Member = group.Outer, Group = inner }));
IExpressionRewriter rewriter = new OuterJoinLogicalRewriter();
expression = rewriter.Rewrite(expression);
Assert.AreEqual(expectedExpression.Type, expression.Type);
Assert.AreEqual(expectedExpression.ToString(), expression.ToString());
}
static OuterJoinLogicalRewriter()
{
JoinGroupOuter =
ReflectionHelper.GetMemberName((JoinGroup <object, object> g) => g.Outer);
JoinGroupInner =
ReflectionHelper.GetMemberName((JoinGroup <object, object> g) => g.Inner);
JoinGroupCreate =
ReflectionHelper.GetStaticMethodInfo(() =>
JoinGroup.Create <object, object>(null, null))
.GetGenericMethodDefinition();
}
public void OuterJoinLogicalRewriter_TripleJoin()
{
// NOTE: some parameter names are hard coded into the optimizer
TestDatabase db = new TestDatabase();
Expression expression = CreateExpression(() =>
db.Members.SelectMany(outer =>
db.Groups
.Where(g => g.Id == outer.GroupId)
.DefaultIfEmpty(),
(outer, inner) =>
new
{
Member = outer,
Group = inner
})
.SelectMany(outer =>
db.Groups
.Where(g => g.Id == outer.Member.GroupId)
.DefaultIfEmpty(),
(outer, inner) =>
new
{
Member = outer.Member,
Group1 = outer.Group,
Group2 = inner
})
.SelectMany(outer =>
db.Groups
.Where(g => g.Id == outer.Member.GroupId)
.DefaultIfEmpty(),
(outer, inner) =>
new
{
Member = outer.Member,
Group1 = outer.Group1,
Group2 = outer.Group2,
Group3 = inner
}));
Expression expectedExpression = CreateExpression(() =>
db.Members.GroupJoin(
db.Groups,
outer => outer.GroupId,
inner => inner.Id,
(outer, inner) => JoinGroup.Create(outer, inner))
.SelectMany(
group => group.Inner.DefaultIfEmpty(),
(group, inner) =>
new
{
Member = group.Outer,
Group = inner
})
.GroupJoin(
db.Groups,
outer => outer.Member.GroupId,
inner => inner.Id,
(outer, inner) => JoinGroup.Create(outer, inner))
.SelectMany(
group => group.Inner.DefaultIfEmpty(),
(group, inner) =>
new
{
Member = group.Outer.Member,
Group1 = group.Outer.Group,
Group2 = inner
})
.GroupJoin(
db.Groups,
outer => outer.Member.GroupId,
inner => inner.Id,
(outer, inner) => JoinGroup.Create(outer, inner))
.SelectMany(
group => group.Inner.DefaultIfEmpty(),
(group, inner) =>
new
{
Member = group.Outer.Member,
Group1 = group.Outer.Group1,
Group2 = group.Outer.Group2,
Group3 = inner
}));
IExpressionRewriter rewriter = new OuterJoinLogicalRewriter();
expression = rewriter.Rewrite(expression);
Assert.AreEqual(expectedExpression.Type, expression.Type);
Assert.AreEqual(expectedExpression.ToString(), expression.ToString());
}