Row#SetRowValue is not considering projection

[unrealhoang]

go-duckdb/row.go

Lines 32 to 37 in 51311da

	func (r Row) SetRowValue(colIdx int, val any) error {
	if !r.IsProjected(colIdx) {
	return nil
	}
	return r.chunk.SetValue(colIdx, int(r.r), val)
	}

Also I see that this function is not being used anywhere, maybe remove it so people not use it mistakenly instead of SetRowValue[T].

[unrealhoang]

also currently there's no way to set row value to null, SetRowValue[*int64](row, colIdx, nil) will raise a cast error: cannot cast *int64 to int64, and returning error to FillRow callback will segfault.