pub fn document_count_chain_position(index: &Index) -> Option<usize>Expand description
The position of the shallowest level of index whose value trees a
count read may stop at, taking the subtree’s document count: the count
chain’s ([Index::shallowest_count_chain_position]), or on a
summableOffCountIndex index the sum chain’s, whose sums are its document
counts. None without such a chain.
Unversioned, so every protocol version reaches it: it departs from the
plain count chain only on a summableOffCountIndex index, which only
meta-schema v3 (protocol version 14) admits.