• There are 232 files with units, with 29,868 lines of code.
• 0 very complex files (McCabe index sum 251+; 0 lines of code)
• 2 complex files (McCabe index sum 126-250; 1,405 lines of code)
• 29 medium complex files (McCabe index sum 51-125; 9,970 lines of code)
• 51 slightly complex files (McCabe index sum 26-50; 8,967 lines of code)
• 150 simple files (McCabe index sum 1-25; 9,526 lines of code)
• 29 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
SparkOrcReader.java in spark/src/main/java/com/netflix/iceberg/spark/data	752	43	187	25	26
Types.java in api/src/main/java/com/netflix/iceberg/types	653	116	161	25	7
ParquetValueReaders.java in parquet/src/main/java/com/netflix/iceberg/parquet	562	75	106	19	11
SparkParquetReaders.java in spark/src/main/java/com/netflix/iceberg/spark/data	595	62	106	18	31
Tasks.java in core/src/main/java/com/netflix/iceberg/util	441	31	103	23	24
Literals.java in api/src/main/java/com/netflix/iceberg/expressions	439	37	92	21	11
ValueReaders.java in core/src/main/java/com/netflix/iceberg/avro	496	62	89	18	7
Truncate.java in api/src/main/java/com/netflix/iceberg/transforms	329	48	87	26	9
ValueWriters.java in core/src/main/java/com/netflix/iceberg/avro	372	58	72	19	4
MergingSnapshotUpdate.java in core/src/main/java/com/netflix/iceberg	359	20	71	20	19
ScanSummary.java in core/src/main/java/com/netflix/iceberg	292	22	65	22	16
TableMetadata.java in core/src/main/java/com/netflix/iceberg	357	36	64	18	6
PigParquetReader.java in pig/src/main/java/com/netflix/iceberg/pig	356	25	63	18	30
ParquetDictionaryRowGroupFilter.java in parquet/src/main/java/com/netflix/iceberg/parquet	278	21	63	23	10
GenericParquetReaders.java in data/src/main/java/com/netflix/iceberg/data/parquet	346	24	62	18	32
SparkOrcWriter.java in spark/src/main/java/com/netflix/iceberg/spark/data	360	21	62	17	19
ParquetValueWriters.java in parquet/src/main/java/com/netflix/iceberg/parquet	363	43	61	17	5
TypeUtil.java in api/src/main/java/com/netflix/iceberg/types	269	35	60	22	7
ParquetMetricsRowGroupFilter.java in parquet/src/main/java/com/netflix/iceberg/parquet	251	21	60	24	7
DynMethods.java in common/src/main/java/com/netflix/iceberg/common	258	40	58	22	3
GenericDataFile.java in core/src/main/java/com/netflix/iceberg	326	23	57	17	16
ParquetAvro.java in parquet/src/main/java/com/netflix/iceberg/parquet	274	28	57	21	6
BaseTransaction.java in core/src/main/java/com/netflix/iceberg	284	39	56	20	8
Parquet.java in parquet/src/main/java/com/netflix/iceberg/parquet	329	39	56	17	11
ParquetAvroValueReaders.java in parquet/src/main/java/com/netflix/iceberg/parquet	331	18	56	17	32
StrictMetricsEvaluator.java in api/src/main/java/com/netflix/iceberg/expressions	197	19	55	28	7
PartitionSpec.java in api/src/main/java/com/netflix/iceberg	293	31	55	19	6
Reader.java in spark/src/main/java/com/netflix/iceberg/spark/source	425	27	55	13	5
Bucket.java in api/src/main/java/com/netflix/iceberg/transforms	237	35	54	23	11
DynFields.java in common/src/main/java/com/netflix/iceberg/common	223	35	52	23	4
PageIterator.java in parquet/src/main/java/com/netflix/iceberg/parquet	328	25	52	16	8
ParquetFilters.java in parquet/src/main/java/com/netflix/iceberg/parquet	203	14	50	25	16
GenericManifestFile.java in core/src/main/java/com/netflix/iceberg	242	22	49	20	10
InclusiveMetricsEvaluator.java in api/src/main/java/com/netflix/iceberg/expressions	180	19	49	27	7
DataFiles.java in core/src/main/java/com/netflix/iceberg	253	31	48	19	5
SchemaUpdate.java in core/src/main/java/com/netflix/iceberg	256	16	47	18	9
AvroSchemaUtil.java in core/src/main/java/com/netflix/iceberg/avro	206	24	47	23	5
Conversions.java in api/src/main/java/com/netflix/iceberg/types	136	4	47	35	17
GenericParquetWriter.java in data/src/main/java/com/netflix/iceberg/data/parquet	222	19	44	20	25
DynConstructors.java in common/src/main/java/com/netflix/iceberg/common	208	24	43	21	4
MessageTypeToType.java in parquet/src/main/java/com/netflix/iceberg/parquet	168	11	43	26	25
PartitionKey.java in spark/src/main/java/com/netflix/iceberg/spark/source	275	25	42	15	4
SchemaToType.java in core/src/main/java/com/netflix/iceberg/avro	172	10	41	24	20
Writer.java in spark/src/main/java/com/netflix/iceberg/spark/source	384	19	41	11	5
TypeConversion.java in orc/src/main/java/com/netflix/iceberg/orc	145	4	40	28	19
Files.java in api/src/main/java/com/netflix/iceberg	163	29	38	23	5
ExpressionVisitors.java in api/src/main/java/com/netflix/iceberg/expressions	117	20	37	32	11
GenericAvroReader.java in core/src/main/java/com/netflix/iceberg/avro	164	13	36	22	18
InclusiveManifestEvaluator.java in api/src/main/java/com/netflix/iceberg/expressions	157	19	36	23	4
ParquetAvroWriter.java in parquet/src/main/java/com/netflix/iceberg/parquet	169	11	36	21	25

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.