Re: Are DataPageHeaderV2.num_nulls and Statistics.null_count redundant?

[Gang Wu]

I think you're right.

The only difference is that statistics is optional but the field in the
header is required.

Best,
Gang

On Wed, Oct 8, 2025 at 8:12 PM Antoine Pitrou <anto...@python.org> wrote:

>
> Hello,
>
> It seems a V2 data page can have its number of nulls recorded in two
> adjacent locations:
> 1. the `num_nulls` field in `DataPageHeaderV2`
> 2. the `null_count` field in `DataPageHeaderV2.statistics`
>
> Is this interpretation right? Or do those two fields actually have
> different semantics.
>
> Regards
>
> Antoine.
>
>
>