# This results in 2 inserts
my_objects = [{'a': 1, 'b': 2}, {'a': 1}]
session.bulk_insert_mappings(MY_OBJECT, my_objects, render_nulls=True)

# This results in 2 inserts
my_objects = [{'a': 1, 'b': 2}, {'a': 1}]
session.bulk_insert_mappings(MY_OBJECT, my_objects, render_nulls=False)

# This results in 2 inserts
my_object = [{'a': 1, 'b': 2}, {'a': 1, 'b': None}]
session.bulk_insert_mappings(MY_OBJECT, my_objects, render_nulls=False)

# This results in 1 insert - BETTER PERFORMANCE
my_object = [{'a': 1, 'b': 2}, {'a': 1, 'b': None}]
session.bulk_insert_mappings(MY_OBJECT, my_objects, render_nulls=True)

# This will result in 2 inserts - BETTER PERFORMANCE
my_objects = [{'a': 1, 'b': 2}, {'a': 2, 'b': 3}, {'a': 4}]
session.bulk_insert_mappings(MY_OBJECT, my_objects)
# This will result in 3 inserts
my_objects = [{'a': 1, 'b': 2}, {'a': 4}, {'a': 2, 'b': 3}]
session.bulk_insert_mappings(MY_OBJECT, my_objects)