public void Iterators_ProbingLeftSemiNestedLoops_ForwardsProperly()
{
var leftRows = new object[] { 1, 2 };
var rightRows = new object[] { 3, 4 };
var expected = new object[, ]
{
{ 1, true },
{ 2, true }
};
using (var left = new MockedIterator(leftRows))
using (var right = new MockedIterator(rightRows))
{
using (var iterator = new ProbingLeftSemiNestedLoopsIterator(left, right, () => true))
{
for (var i = 0; i < 2; i++)
{
AssertProduces(iterator, expected);
}
}
Assert.Equal(2, left.TotalOpenCount);
Assert.Equal(4, left.TotalReadCount);
Assert.Equal(1, left.DisposalCount);
Assert.Equal(4, right.TotalOpenCount);
Assert.Equal(4, right.TotalReadCount);
Assert.Equal(1, right.DisposalCount);
}
}
public void Iterators_ProbingLeftSemiNestedLoops_MatchesRows()
{
var leftRows = new object[, ]
{
{ 1, "1-Left" },
{ 2, "2-Left-A" },
{ 2, "2-Left-B" },
{ 3, "3-Left" },
{ 4, "4-Left" },
{ 5, "5-Left" }
};
var rightRows = new object[] { 2, 3, 3, 5 };
var expected = new object[, ]
{
{ 1, "1-Left", false },
{ 2, "2-Left-A", true },
{ 2, "2-Left-B", true },
{ 3, "3-Left", true },
{ 4, "4-Left", false },
{ 5, "5-Left", true }
};
using (var left = new MockedIterator(leftRows))
using (var right = new MockedIterator(rightRows))
{
var iteratorPredicate = new IteratorPredicate(() => Equals(left.RowBuffer[0], right.RowBuffer[0]));
using (var iterator = new ProbingLeftSemiNestedLoopsIterator(left, right, iteratorPredicate))
{
AssertProduces(iterator, expected);
}
}
}
public void Iterators_ProbingLeftSemiNestedLoops_ReturnsEmpty_WhenLeftIsEmpty()
{
var leftRows = new object[0];
var rightRows = new object[0];
using (var left = new MockedIterator(leftRows))
using (var right = new MockedIterator(rightRows))
{
var iteratorPredicate = new IteratorPredicate(() => true);
using (var iterator = new ProbingLeftSemiNestedLoopsIterator(left, right, iteratorPredicate))
{
AssertEmpty(iterator);
}
}
}
public void Iterators_ProbingLeftSemiNestedLoops_ReturnsLeft_WhenRightIsEmpty()
{
var leftRows = new object[] { 1, 2, 3 };
var rightRows = new object[0];
var expected = new object[, ]
{
{ 1, false },
{ 2, false },
{ 3, false }
};
using (var left = new MockedIterator(leftRows))
using (var right = new MockedIterator(rightRows))
{
var iteratorPredicate = new IteratorPredicate(() => true);
using (var iterator = new ProbingLeftSemiNestedLoopsIterator(left, right, iteratorPredicate))
{
AssertProduces(iterator, expected);
}
}
}
