protected override bool InternalChange(Program program, IRow oldRow, IRow newRow, BitArray valueFlags, string columnName)
{
bool changed = false;
if (PropagateChangeLeft)
{
changed = LeftNode.Change(program, oldRow, newRow, valueFlags, columnName);
}
if (PropagateChangeRight)
{
changed = RightNode.Change(program, oldRow, newRow, valueFlags, columnName) || changed;
}
return(changed);
}