in pyqldb/util/qldb_hash.py [0:0]
def _join_hashes_pair_wise(h1, h2):
"""
Takes two hashes, sorts them, and concatenates them.
"""
if len(h1) == 0:
return h2
if len(h2) == 0:
return h1
if QldbHash._hash_comparator(h1, h2) < 0:
concatenated = h1 + h2
else:
concatenated = h2 + h1
return concatenated