public Cursor(GroupTransform parent, Func <int, bool> predicate)
: base(parent.Host)
{
Ch.AssertValue(predicate);
_parent = parent;
var binding = _parent._groupBinding;
_active = Utils.BuildArray(binding.OutputSchema.Count, predicate);
_groupCount = binding.GroupColumnIndexes.Length;
bool[] srcActiveLeading = new bool[_parent.Source.Schema.Count];
foreach (var col in binding.GroupColumnIndexes)
{
srcActiveLeading[col] = true;
}
var activeCols = _parent.Source.Schema.Where(x => x.Index < srcActiveLeading.Length && srcActiveLeading[x.Index]);
_leadingCursor = parent.Source.GetRowCursor(activeCols);
bool[] srcActiveTrailing = new bool[_parent.Source.Schema.Count];
for (int i = 0; i < _groupCount; i++)
{
if (_active[i])
{
srcActiveTrailing[binding.GroupColumnIndexes[i]] = true;
}
}
for (int i = 0; i < binding.KeepColumnIndexes.Length; i++)
{
if (_active[i + _groupCount])
{
srcActiveTrailing[binding.KeepColumnIndexes[i]] = true;
}
}
activeCols = _parent.Source.Schema.Where(x => x.Index < srcActiveTrailing.Length && srcActiveTrailing[x.Index]);
_trailingCursor = parent.Source.GetRowCursor(activeCols);
_groupCheckers = new GroupKeyColumnChecker[_groupCount];
for (int i = 0; i < _groupCount; i++)
{
_groupCheckers[i] = new GroupKeyColumnChecker(_leadingCursor, _parent._groupBinding.GroupColumnIndexes[i]);
}
_aggregators = new KeepColumnAggregator[_parent._groupBinding.KeepColumnIndexes.Length];
for (int i = 0; i < _aggregators.Length; i++)
{
if (_active[i + _groupCount])
{
_aggregators[i] = KeepColumnAggregator.Create(_trailingCursor, _parent._groupBinding.KeepColumnIndexes[i]);
}
}
}
public Cursor(GroupTransform parent, Func <int, bool> predicate)
: base(parent.Host)
{
Ch.AssertValue(predicate);
_parent = parent;
var schema = _parent._groupSchema;
_active = Utils.BuildArray(schema.ColumnCount, predicate);
_groupCount = schema.GroupIds.Length;
bool[] srcActiveLeading = new bool[_parent.Source.Schema.ColumnCount];
foreach (var col in schema.GroupIds)
{
srcActiveLeading[col] = true;
}
_leadingCursor = parent.Source.GetRowCursor(x => srcActiveLeading[x]);
bool[] srcActiveTrailing = new bool[_parent.Source.Schema.ColumnCount];
for (int i = 0; i < _groupCount; i++)
{
if (_active[i])
{
srcActiveTrailing[schema.GroupIds[i]] = true;
}
}
for (int i = 0; i < schema.KeepIds.Length; i++)
{
if (_active[i + _groupCount])
{
srcActiveTrailing[schema.KeepIds[i]] = true;
}
}
_trailingCursor = parent.Source.GetRowCursor(x => srcActiveTrailing[x]);
_groupCheckers = new GroupKeyColumnChecker[_groupCount];
for (int i = 0; i < _groupCount; i++)
{
_groupCheckers[i] = new GroupKeyColumnChecker(_leadingCursor, _parent._groupSchema.GroupIds[i]);
}
_aggregators = new KeepColumnAggregator[_parent._groupSchema.KeepIds.Length];
for (int i = 0; i < _aggregators.Length; i++)
{
if (_active[i + _groupCount])
{
_aggregators[i] = KeepColumnAggregator.Create(_trailingCursor, _parent._groupSchema.KeepIds[i]);
}
}
}