facebookincubator / OnlineSchemaChange

Conditional Complexity

The distribution of complexity of units (measured with McCabe index).

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 390 units with 4,739 lines of code in units (69.4% of code).

1 very complex units (155 lines of code)
2 complex units (158 lines of code)
17 medium complex units (690 lines of code)
39 simple units (847 lines of code)
331 very simple units (2,889 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
def parse() in core/lib/sqlparse/create.py	155	55	2
def partition_to_model() in core/lib/sqlparse/create.py	84	33	2
def _gen_col_sql() in core/lib/sqlparse/diff.py	74	26	1
def need_default_ts_bootstrap() in core/lib/sqlparse/diff.py	32	22	2
def to_partial_sql() in core/lib/sqlparse/models.py	50	21	1
def _calculate_diff() in core/lib/sqlparse/diff.py	59	21	1
def _update_index_attrs_changes() in core/lib/sqlparse/diff.py	32	17	2
def _update_col_attrs_changes() in core/lib/sqlparse/diff.py	34	16	3
def kill_selects() in core/lib/payload/copy.py	40	16	3
def need_checksum() in core/lib/payload/copy.py	42	16	1
def validate_args() in core/commands/copy.py	37	15	1
def to_sql() in core/lib/sqlparse/models.py	31	14	1
def run_ddl() in core/lib/payload/copy.py	78	14	3
def cleanup() in core/lib/payload/cleanup.py	50	13	2
def run() in core/lib/payload/base.py	47	13	1
def to_sql() in core/lib/sqlparse/models.py	27	12	1
def pre_osc_check() in core/lib/payload/copy.py	58	12	1
def droppable_indexes() in core/lib/sqlparse/models.py	15	11	2
def cleanup_with_force() in core/lib/payload/copy.py	38	11	1
def get_long_trx() in core/lib/payload/copy.py	20	11	1
def _gen_idx_sql() in core/lib/sqlparse/diff.py	27	10	1
def change_rocksdb_bulk_load() in core/lib/payload/copy.py	21	10	2
def sync_table_partitions() in core/lib/payload/copy.py	43	10	1
def to_sql() in core/lib/sqlparse/models.py	26	9	1
def has_same_default() in core/lib/sqlparse/models.py	15	9	2
def __eq__() in core/lib/sqlparse/models.py	24	9	2
def decide_pk_for_filter() in core/lib/payload/copy.py	38	9	1
def replay_till_good2go() in core/lib/payload/copy.py	40	9	2
def is_equal() in core/lib/sqlparse/models.py	12	8	2
def checksum_column_list() in core/lib/payload/copy.py	14	8	1
def determine_outfile_dir() in core/lib/payload/copy.py	17	8	1
def select_table_into_outfile() in core/lib/payload/copy.py	31	8	1
def load_data() in core/lib/payload/copy.py	33	8	1
def divide_changes_to_group() in core/lib/payload/copy.py	24	8	2
def checksum_for_changes() in core/lib/payload/copy.py	23	8	2
def read_ddl_files() in core/lib/payload/base.py	27	8	1
def read_sqls() in core/lib/hook.py	25	8	1
def pre_run() in core/commands/direct.py	22	8	1
def get_type_conv_columns() in core/lib/sqlparse/diff.py	14	7	2
def parse_session_overrides_str() in core/lib/payload/copy.py	14	7	2
def check_disk_size() in core/lib/payload/copy.py	22	7	1
def validate_post_alter_pk() in core/lib/payload/copy.py	14	7	1
def lock_tables() in core/lib/payload/copy.py	29	7	2
def recreate_non_unique_indexes() in core/lib/payload/copy.py	12	7	1
def checksum() in core/lib/payload/copy.py	33	7	1
def execute_sqls() in core/lib/hook.py	23	7	1
def to_sql() in core/lib/sqlparse/models.py	21	6	1
def to_sql() in core/lib/sqlparse/models.py	19	6	1
def is_myrocks_ttl_table() in core/lib/sqlparse/models.py	15	6	1
def __str__() in core/lib/sqlparse/diff.py	16	6	1