public IRowCursor[] GetRowCursorSet(out IRowCursorConsolidator consolidator, Func <int, bool> needCol, int n, IRandom rand = null)
{
var cur = GetRowCursor(needCol, rand);
consolidator = new Consolidator();
if (n >= 2)
{
var setColumns = new HashSet <int>(_columns);
var res = new IRowCursor[n];
var empty = new EmptyCursor(this,
col => setColumns.Contains(col) || needCol(col) || (_otherValues != null && _otherValues.IsColumnActive(col)));
for (int i = 0; i < n; ++i)
{
res[i] = i == 0 ? cur : empty;
}
return(res);
}
else
{
return new IRowCursor[] { cur }
};
}
public IRowCursor[] GetRowCursorSet(out IRowCursorConsolidator consolidator, Func <int, bool> needCol, int n, IRandom rand = null)
{
var cur = GetRowCursor(needCol, rand);
consolidator = new Consolidator();
if (n >= 2)
{
// This trick avoids the cursor to be split into multiple later.
var res = new IRowCursor[n];
var empty = new EmptyCursor(this,
col => col == _column || needCol(col) ||
(_otherValues != null && _otherValues.IsColumnActive(col)));
for (int i = 0; i < n; ++i)
{
res[i] = i == 0 ? cur : empty;
}
return(res);
}
else
{
return new IRowCursor[] { cur }
};
}
