@BatchSize(10): 100 authors, 11 queries (expected 11 = 1 + ceil(100/10)), books touched = 300
@EntityGraph (fetchgraph hint): 100 authors, 1 queries, books touched = 300
JPQL JOIN FETCH: 100 authors, 1 queries, books touched = 300
=== Side-by-side query counts for 100 authors x 3 books each ===
naive lazy iteration : 101 queries
JPQL JOIN FETCH      : 1 queries
@EntityGraph         : 1 queries
@BatchSize(10)       : 11 queries