apache / datafusion-sqlparser-rs - Conditional Complexity

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 1,002 units with 15,373 lines of code in units (59.7% of code).

4 very complex units (3,046 lines of code)
3 complex units (469 lines of code)
12 medium complex units (1,045 lines of code)
31 simple units (1,154 lines of code)
952 very simple units (9,659 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
fn fmt() in src/ast/mod.rs	1660	256	2
fn next_token() in src/tokenizer.rs	673	71	3
fn fmt() in src/ast/dml.rs	221	57	2
fn fmt() in src/ast/mod.rs	492	56	2
fn fmt() in src/ast/query.rs	263	38	2
fn get_next_precedence_default() in src/dialect/mod.rs	110	27	2
fn fmt() in src/ast/query.rs	96	26	2
fn fmt() in src/ast/dml.rs	71	23	2
fn fmt() in src/ast/ddl.rs	281	23	2
def generate_changelog() in dev/release/generate-changelog.py	44	23	5
fn tokenize_dollar_preceded_value() in src/tokenizer.rs	76	20	2
fn fmt() in src/ast/ddl.rs	62	19	2
fn tokenize_quoted_string() in src/tokenizer.rs	87	18	3
fn tokenize_numeric_prefix_trait() in src/tokenizer.rs	27	15	0
fn fmt() in src/ast/ddl.rs	112	14	2
fn parse_statement() in src/dialect/snowflake.rs	75	13	2
fn fmt() in src/ast/ddl.rs	117	12	2
fn fmt() in src/ast/mod.rs	51	12	2
fn fmt() in src/ast/dml.rs	42	11	2
fn fmt() in src/ast/query.rs	31	10	2
fn is_identifier_part() in src/dialect/hive.rs	9	9	2
fn fmt() in src/ast/query.rs	47	8	2
fn fmt() in src/ast/dcl.rs	43	8	2
fn fmt() in src/ast/mod.rs	82	8	2
fn is_identifier_part() in src/dialect/snowflake.rs	7	7	2
fn tokenize_quoted_string_escape() in src/tokenizer.rs	53	7	0
fn fmt() in src/ast/data_type.rs	280	7	2
fn fmt() in src/ast/dml.rs	30	7	2
fn fmt() in src/ast/mod.rs	26	7	2
fn test_one_or_many_with_parens_value_into_iter() in src/ast/mod.rs	59	7	0
fn is_identifier_part() in src/dialect/mssql.rs	8	6	2
fn parse_if_stmt() in src/dialect/mssql.rs	71	6	2
fn parse_statement_list() in src/dialect/mssql.rs	22	6	3
fn is_identifier_start() in src/dialect/sqlite.rs	6	6	2
fn is_identifier_part() in src/dialect/ansi.rs	3	6	2
fn is_identifier_part() in src/dialect/generic.rs	8	6	2
fn is_identifier_start() in src/dialect/hive.rs	3	6	2
fn parse_column_option() in src/dialect/snowflake.rs	28	6	2
fn parse_stage_params() in src/dialect/snowflake.rs	42	6	1
fn is_identifier_start() in src/dialect/bigquery.rs	4	6	2
fn is_identifier_part() in src/dialect/bigquery.rs	3	6	2
fn tokenize_multiline_comment() in src/tokenizer.rs	36	6	2
fn unescape() in src/tokenizer.rs	32	6	1
fn fmt() in src/ast/query.rs	18	6	2
fn fmt() in src/ast/query.rs	19	6	2
fn fmt() in src/ast/ddl.rs	29	6	2
fn fmt() in src/ast/mod.rs	34	6	2
fn fmt() in src/ast/mod.rs	26	6	2
fn fmt() in src/ast/mod.rs	74	6	2
fn fmt() in src/ast/helpers/stmt_data_loading.rs	21	6	2