feat(gql): TCK-verified transformer rework (161 dual-run cases, opengql/tck 190/206)

.gitignore

@@ -1 +1,4 @@
 build/
+
+# generated e2e_test case index (see test/runner/e2e_test.cpp)
+test_list

gql/CMakeLists.txt

@@ -2,6 +2,7 @@ include_directories(
         ${PROJECT_SOURCE_DIR}/src/include
         ${CMAKE_BINARY_DIR}/src/include
         ${PROJECT_SOURCE_DIR}/third_party/antlr4_runtime/src
+        ${PROJECT_SOURCE_DIR}/third_party/yyjson/src  # For _GQL_TO_JSON/_GQL_MAX/_GQL_MIN (json_utils.h pulls in yyjson.h)
         src/include
         src/parser
         ${PROJECT_SOURCE_DIR}/src/include/parser/antlr_parser)  # For GQL parser includes

gql/THIRD_PARTY_NOTICES.md

@@ -0,0 +1,71 @@
+# Third-Party Notices — GQL extension
+
+This extension's GQL→Cypher translation layer adapts mapping rules and
+conformance knowledge from the following open-source projects. We gratefully
+acknowledge their authors.
+
+## Neo4j Cypher front-end (neo4j/neo4j)
+
+- Source: https://github.com/neo4j/neo4j
+- Files consulted / adapted:
+  - `community/cypher/front-end/rewriting/src/main/scala/org/neo4j/cypher/internal/rewriting/rewriters/astRewriters/GQLAliasFunctionNameRewriter.scala`
+    — GQL function-alias → Cypher function mapping table (re-targeted to
+    LadybugDB's own function catalog in `gql_transformer.cpp`
+    `GQL_FUNCTION_MAP`).
+  - `PropertyExistsToIsNotNull.scala` — PROPERTY_EXISTS → IS NOT NULL rewrite
+    semantics (GQL feature G115).
+  - `LabelExpressionPredicateNormalizer.scala`, `NormalizeHasLabelsAndHasType.scala`
+    — label-expression normalization approach.
+  - `AddElementUniquenessPredicates.scala`, `AddPathPredicates.scala` —
+    quantified-path-pattern quantifier bounds (`getLowerBound`/`getUpperBound`:
+    `*`→0..∞, `+`→1..∞, `{m,n}`→m..n) and path-mode uniqueness semantics
+    (WALK/TRAIL/ACYCLIC), adapted for the single-hop QPPI → var-length mapping
+    in `gql_transformer.cpp` `quantifierRange`.
+  - `GraphTypeCanonicalizer.scala` — canonical graph-type form (named node
+    types with property types + named edge types with endpoint pairs, local
+    aliases stripped), adapted for the `GraphTypeSpec` model in
+    `gql_transformer.cpp` (CREATE GRAPH TYPE → node/rel table schema bridge).
+  - `front-end/expressions/.../PathMode.scala` — GQL path-mode semantics
+    reference (`PathMode.effectivePathMode`).
+  - `community/neo4j-gql-status/` — GQL-status error envelope conventions.
+- License: Apache License 2.0
+- Copyright (c) "Neo4j" Neo4j Sweden AB
+
+Adapted portions are rewritten in C++ for LadybugDB's parse-tree model and
+re-targeted to LadybugDB's Cypher dialect; the Apache-2.0 license terms apply
+to the adapted mapping tables/rules. License text:
+https://www.apache.org/licenses/LICENSE-2.0
+
+## opengql / LDBC GQL Implementation Working Group (gql-antlr)
+
+- Source: https://github.com/opengql/grammar
+- Usage: `extension/third_party/opengql/GQL.g4` (vendored ANTLR grammar for
+  ISO GQL, generated from the ISO BNF artifacts via gramgen and hand-tuned).
+- License: Apache License 2.0
+
+## opengql/tck (GQL Technology Compatibility Kit)
+
+- Source: https://github.com/opengql/tck
+- Usage: `extension/gql/test/tck/{features,data,NOTICE.md,LICENSE}`
+  (vendored Gherkin conformance scenarios and sample data) and the
+  `run_tck.py` runner built around them. Scenarios derived from the
+  openCypher TCK retain their Neo4j attribution headers; see the vendored
+  `NOTICE.md`.
+- License: Apache License 2.0
+
+## ISO/IEC 39075:2024 GQL standard
+
+- The GQL language itself is defined by ISO/IEC 39075:2024. The machine-readable
+  grammar artifact (`ISO_IEC_39075(en).bnf.txt` / `.bnf.xml` published at
+  standards.iso.org) is used as the reference for language-scope decisions.
+- The standard document itself is copyrighted by ISO; only its published
+  grammar artifact is used as a language definition reference.
+
+## Reference copies in this repository
+
+Local copies of several sources listed above (Neo4j rewriters and the Cypher 25
+grammar, the ISO GQL grammar artifact) are kept in `docs/gql_ref/` for
+consulting while maintaining the translation layer; its `README.md` indexes
+them and records which piece of `src/gql_transformer.cpp` each one informed.
+The ISO grammar artifact is internal reference only and is not committed to
+git.

gql/src/function/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_library(lbug_gql_extension_function
         OBJECT
-        gql_function.cpp)
+        gql_function.cpp
+        gql_json_functions.cpp)
 
 set(GQL_EXTENSION_OBJECT_FILES
         ${GQL_EXTENSION_OBJECT_FILES} $<TARGET_OBJECTS:lbug_gql_extension_function>