Function null_counts_page_statistics

pub(crate) fn null_counts_page_statistics<'a, I>(
    iterator: I,
) -> Result<UInt64Array>
where
    I: Iterator<Item = (usize, &'a Index)>,

Extracts the null count statistics from an iterator of parquet page Index’es to an [ArrayRef]

The returned Array is an [UInt64Array]