public override Value Accum(ExecContext context, Value old, Row input)
{
var arg = arg_().Exec(context, input);
Type ltype, rtype; ltype = typeof(int); rtype = typeof(int);
Debug.Assert(old != null);
AvgPair oldpair = old as AvgPair;
if (oldpair.sum_ is null)
{
pair_.sum_ = arg;
Debug.Assert(oldpair.count_ == 0);
if (arg != null)
{
pair_.count_ = 1;
}
}
else
{
dynamic lv = oldpair.sum_;
if (!(arg is null))
{
dynamic rv = arg;
pair_.sum_ = lv + rv;
pair_.count_ = oldpair.count_ + 1;
}
}
return(pair_);
}
public override Value Init(ExecContext context, Row input)
{
pair_ = new AvgPair();
pair_.sum_ = arg_().Exec(context, input);
pair_.count_ = pair_.sum_ is null ? 0 : 1;
return(pair_);
}
