Function all_null_value_column 

pub(crate) fn all_null_value_column(len: usize) -> ArrayRef

Returns an all-null binary value column of the given length.

The shredding spec requires the value column to always be present in the schema, so producers that have no unshredded values to store must still emit an all-null column. See https://github.com/apache/arrow-rs/issues/10306.