elastic / elasticsearch - 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 136,037 units with 1,363,633 lines of code in units (71.0% of code).

21 very complex units (6,470 lines of code)
196 complex units (25,311 lines of code)
1,942 medium complex units (117,304 lines of code)
5,924 simple units (189,186 lines of code)
127,954 very simple units (1,025,362 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
public static PainlessCast getLegalCast() in modules/lang-painless/src/main/java/org/elasticsearch/painless/AnalyzerCaster.java	374	296	5
public final StatementContext statement() in x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java	699	260	0
Table buildTable() in server/src/main/java/org/elasticsearch/rest/action/cat/RestIndicesAction.java	203	149	4
Table buildTable() in server/src/main/java/org/elasticsearch/rest/action/cat/RestNodesAction.java	172	124	5
private SearchSourceBuilder parseXContent() in server/src/main/java/org/elasticsearch/search/builder/SearchSourceBuilder.java	331	106	4
public static ScriptCode unicodeScriptToULScript() in x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/inference/preprocessing/customwordembedding/ScriptCode.java	208	104	1
public record IndicesOptions() in server/src/main/java/org/elasticsearch/action/support/IndicesOptions.java	1094	92	3
public final RstatementContext rstatement() in modules/lang-painless/src/main/java/org/elasticsearch/painless/antlr/PainlessParser.java	270	92	0
public void visitDot() in modules/lang-painless/src/main/java/org/elasticsearch/painless/phase/DefaultSemanticAnalysisPhase.java	306	90	2
public void execute() in x-pack/plugin/security/cli/src/main/java/org/elasticsearch/xpack/security/cli/AutoConfigureNode.java	610	89	4
private ValueExpressionContext valueExpression() in x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java	190	88	1
public TokenStream create() in modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/StemmerTokenFilterFactory.java	160	86	1
static DateFormatter forPattern() in server/src/main/java/org/elasticsearch/common/time/DateFormatters.java	178	85	1
public DesiredBalance compute() in server/src/main/java/org/elasticsearch/cluster/routing/allocation/allocator/DesiredBalanceComputer.java	318	75	4
private void addToSet() in x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/scheduler/Cron.java	106	70	4
private int storeExpressionVals() in x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/scheduler/Cron.java	163	68	3
public long getNextValidTimeAfter() in x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/scheduler/Cron.java	312	66	1
protected Map transform() in modules/ingest-geoip/src/main/java/org/elasticsearch/ingest/geoip/MaxmindIpDataLookups.java	173	66	1
private ParseResult parse() in server/src/main/java/org/elasticsearch/common/time/Iso8601Parser.java	187	58	2
public void visitComparison() in modules/lang-painless/src/main/java/org/elasticsearch/painless/phase/DefaultConstantFoldingOptimizationPhase.java	158	55	2
synchronized void expand() in x-pack/plugin/graph/src/main/java/org/elasticsearch/xpack/graph/action/TransportGraphExploreAction.java	258	54	1
public final FunctionExpressionContext functionExpression() in x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java	81	50	0
void addNumericField() in x-pack/plugin/old-lucene-versions/src/main/java/org/elasticsearch/xpack/lucene/bwc/codecs/lucene54/Lucene54DocValuesConsumer.java	187	50	3
private NoncondexpressionContext noncondexpression() in modules/lang-painless/src/main/java/org/elasticsearch/painless/antlr/PainlessParser.java	233	50	1
private static Expression propagate() in x-pack/plugin/ql/src/main/java/org/elasticsearch/xpack/ql/optimizer/OptimizerRules.java	110	49	1
public final FunctionNameContext functionName() in x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java	81	49	0
record DateTime() in server/src/main/java/org/elasticsearch/common/time/DateTime.java	117	49	9
public record UnassignedInfo() in server/src/main/java/org/elasticsearch/cluster/routing/UnassignedInfo.java	297	49	10
public void visitBinaryMath() in modules/lang-painless/src/main/java/org/elasticsearch/painless/phase/DefaultConstantFoldingOptimizationPhase.java	230	49	2
private static void checkExpected() in benchmarks/src/main/java/org/elasticsearch/benchmark/compute/operator/EvalBenchmark.java	133	48	2
private static Expression propagate() in x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/rules/logical/PropagateEquals.java	109	48	2
private Table buildTable() in x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/rest/cat/RestCatJobsAction.java	95	48	2
private void parseSource() in server/src/main/java/org/elasticsearch/search/SearchService.java	189	48	3
public void writeCast() in modules/lang-painless/src/main/java/org/elasticsearch/painless/MethodWriter.java	72	48	1
public final IdentifierContext identifier() in x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java	74	47	0
private boolean parseActionLine() in server/src/main/java/org/elasticsearch/action/bulk/BulkRequestParser.java	211	47	3
record RemoteClusterClientBootstrapOptions() in x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/core/security/transport/netty4/SecurityNetty4Transport.java	133	46	8
private static void parseDocuments() in server/src/main/java/org/elasticsearch/action/get/MultiGetRequest.java	136	46	7
public XContentBuilder innerToXContent() in server/src/main/java/org/elasticsearch/search/builder/SearchSourceBuilder.java	147	46	2
public void visitBrace() in modules/lang-painless/src/main/java/org/elasticsearch/painless/phase/DefaultSemanticAnalysisPhase.java	127	46	2
private static Expression propagate() in x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/rules/logical/PropagateEquals.java	143	45	2
private static Expression propagate() in x-pack/plugin/ql/src/main/java/org/elasticsearch/xpack/ql/optimizer/OptimizerRules.java	139	45	1
public TextStructure build() in x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/textstructure/structurefinder/TextStructure.java	136	45	0
public final UnquoteIdentifierContext unquoteIdentifier() in x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java	80	45	0
public ActionRequestValidationException validate() in server/src/main/java/org/elasticsearch/search/builder/SearchSourceBuilder.java	133	45	3
is used as the directory name() in x-pack/plugin/security/cli/src/main/java/org/elasticsearch/xpack/security/cli/CertificateTool.java	386	44	1
static long calculateDetectorRequirementBytes() in x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/action/TransportEstimateModelMemoryAction.java	103	44	3
public final boolean incrementToken() in x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/categorization/MlStandardTokenizer.java	87	44	0
public static Automaton minimize() in server/src/main/java/org/elasticsearch/lucene/util/automaton/MinimizationOperations.java	162	44	2
public static IndexMetadata fromXContent() in server/src/main/java/org/elasticsearch/cluster/metadata/IndexMetadata.java	150	44	2