A collection of hash tables distributing the entries based on a permutation of the same hash function used for the splits.
The struct split-hash-table has a constructor %make-split-hash-table that takes a hash function and a vector of splits as parameters.
Read-only accessor split-hash-table-hash-function refers to the hash function.
Read-only accessor split-hash-table-vector of type simple-vector refers to the splits.
Primary use of this struct is to allow for locking splits separately to avoid lock contention when operating on a hash table in parallel.