// effects: Align the fields of each cell in mapping using projectedSlotMap that has a mapping
// for each member of this extent to the slot number of that member in the projected slots
// example:
// input: Proj[A,B,"5"] = Proj[F,"7",G]
// Proj[C,B] = Proj[H,I]
// output: m_projectedSlotMap: A -> 0, B -> 1, C -> 2
// Proj[A,B,null] = Proj[F,"7",null]
// Proj[null,B,C] = Proj[null,I,H]
private static List <Cell> AlignFields(IEnumerable <Cell> cells, MemberProjectionIndex projectedSlotMap,
ViewTarget viewTarget)
{
List <Cell> outputCells = new List <Cell>();
// Determine the aligned field for each cell
// The new cells have ProjectedSlotMap.Count number of fields
foreach (Cell cell in cells)
{
// If isQueryView is true, we need to consider the C side of
// the cells; otherwise, we look at the S side. Note that we
// CANNOT use cell.LeftQuery since that is determined by
// cell's isQueryView
// The query for which we are constructing the extent
CellQuery mainQuery = cell.GetLeftQuery(viewTarget);
CellQuery otherQuery = cell.GetRightQuery(viewTarget);
CellQuery newMainQuery;
CellQuery newOtherQuery;
// Create both queries where the projected slot map is used
// to determine the order of the fields of the mainquery (of
// course, the otherQuery's fields are aligned automatically)
mainQuery.CreateFieldAlignedCellQueries(otherQuery, projectedSlotMap,
out newMainQuery, out newOtherQuery);
Cell outputCell = viewTarget == ViewTarget.QueryView ?
Cell.CreateCS(newMainQuery, newOtherQuery, cell.CellLabel, cell.CellNumber) :
Cell.CreateCS(newOtherQuery, newMainQuery, cell.CellLabel, cell.CellNumber);
outputCells.Add(outputCell);
}
return(outputCells);
}