/// <summary>
/// Initializes a new instance of the <see cref="Scan"/> class.
/// </summary>
/// <param name="planOperator">The descriptive query plan operator that is the counterpart of this physical operator.</param>
/// <param name="cursor">The triple cursor used for reading in triples.</param>
/// <param name="inputSortOrder">The sort order the triples arrive in.</param>
/// <param name="pattern">The Simple Access Pattern to match.</param>
/// <param name="count">The number of triples to read.</param>
public Scan(qp::Operator planOperator, TripleCursor cursor, SortOrder inputSortOrder, Triple <TripleItem, TripleItem, TripleItem> pattern, long count = -1)
{
m_planOperator = planOperator;
#if DEBUG
m_planOperator.StartCPUWork();
#endif
m_cursor = cursor;
m_inputOrder = inputSortOrder;
m_pattern = pattern;
if (count > -1)
{
m_isMiniBucket = true;
m_count = count;
}
else
{
m_isMiniBucket = false;
}
//
// identify the atoms in the given SAP to match
m_patternAtoms = TriplePosition.None;
if (m_pattern.S is Atom)
{
m_patternAtoms |= TriplePosition.S;
}
if (m_pattern.P is Atom)
{
m_patternAtoms |= TriplePosition.P;
}
if (m_pattern.O is Atom)
{
m_patternAtoms |= TriplePosition.O;
}
#if DEBUG
m_planOperator.StopCPUWork();
#endif
//
// prepare the next set of output bindings
TryReadNext();
}
/// <summary>
/// Initializes a new instance of the <see cref="HashJoin"/> class.
/// </summary>
/// <param name="planOperator">The descriptive query plan operator that is the counterpart of this physical operator.</param>
/// <param name="left">This operator's left input operator.</param>
/// <param name="right">This operator's right input operator.</param>
public HashJoin(qp::Operator planOperator, Operator left, Operator right)
{
m_planOperator = planOperator;
#if DEBUG
m_planOperator.StartCPUWork();
#endif
m_left = left;
m_right = right;
m_tmpDbsCreated = false;
m_joinVariables = new List <Variable>();
m_byteComparer = new ByteArrayComparer(1);
m_chunkTable = new Dictionary <byte[], List <BindingSet> >(new ByteArrayEqualityComparer());
m_currentChunkList = new Queue <BindingSet>();
#if DEBUG
m_planOperator.StopCPUWork();
#endif
//
// prepare the next set of output bindings
TryReadNext();
}