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<span>GQL Conformance Profile</span>
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</script><p>This document captures implementation-defined behaviors and diagnostics relevant to ordering, pagination, and query execution. Geode maintains full ISO/IEC 39075:2024 GQL compliance; the profile explains how those requirements are met in practice.</p>
<h3 id="supported-highlights" class="position-relative d-flex align-items-center group">
<span>Supported (highlights)</span>
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</h3><p>The highlights below are non-exhaustive and focus on areas with implementation-defined behavior or additional policy constraints.</p>
<ul>
<li>MATCH with:
<ul>
<li>Node label and single property equality predicate (baseline)</li>
<li>Single-hop expand and bounded path expansion</li>
<li>OPTIONAL MATCH (null-preserving) semantics</li>
</ul>
</li>
<li>ORDER BY over RETURN items for MATCH result bindings, with deterministic comparator and JSON lexicographic tiebreak.</li>
<li>LIMIT/OFFSET slicing post-ordering.</li>
<li>Set operations: UNION/INTERSECT/EXCEPT (existing engine path).</li>
<li>Data modification statements (CREATE/INSERT/UPDATE/DELETE/MERGE).</li>
<li>Schema and type system behaviors (labels, property types, constraints, indexes).</li>
<li>Functions and aggregations (scalar and aggregate semantics).</li>
<li>Transaction semantics with ACID guarantees and MVCC isolation.</li>
</ul>
<h4 id="deterministic-transport-parity-evidence-curated-datasets" class="position-relative d-flex align-items-center group">
<span>Deterministic Transport Parity Evidence (Curated Datasets)</span>
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</h4><ul>
<li>Curated varlen determinism dataset (<code>data/varlen_determinism</code>) exercises equal-length path expansions to validate whole-row JSON lex tie-break and UA005/UA006 ordering consistency.</li>
<li>Transport parity (QUIC vs gRPC) verified for: simple RETURN ordering, set operations DISTINCT, projection slices, ORDER/LIMIT/OFFSET pagination, MATCH variable-length expansions, diagnostics (US001, IllegalOrderKey), CASE 3VL null semantics, and nulls-last ordering.</li>
</ul>
<p>// CANARY: REQ=REQ-GQL-018; FEATURE=“Transport Parity VarLen Dataset Rows”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_018_TransportParity_VarLenDatasetRows; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-091; FEATURE=“Client Server Arg Passthrough”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_091_ClientServerArgPassthrough; OWNER=client; UPDATED=2025-09-24</p>
<p>// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity Simple RETURN”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_ReturnOrdered; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity SetOp DISTINCT”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_SetOpDistinct; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity Projection Rows”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_ProjectionRows; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity ORDER/LIMIT/OFFSET Rows”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_OrderPaginationRows; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity MATCH VarLen Rows”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_MatchVarLenRows; OWNER=engine; UPDATED=2025-09-24</p>
<p>// CANARY: REQ=REQ-GQL-017; FEATURE=“VarLen Path Determinism UA005/UA006”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_VarLenDeterminism_QUIC; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-017; FEATURE=“VarLen Path Determinism UA005/UA006”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_VarLenDeterminism_GRPC; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity Diagnostics US001”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_US001; OWNER=engine; UPDATED=2025-09-24</p>
<h3 id="policies-and-diagnostics" class="position-relative d-flex align-items-center group">
<span>Policies and Diagnostics</span>
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</h3><ul>
<li>US001 (unordered pagination): LIMIT/OFFSET without explicit ORDER is rejected. Anchor: 16.18–16.19.</li>
<li>IllegalOrderKey (policy): ORDER BY keys restricted to identifiers by default. Anchor: 14.10.
// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity Diagnostics IllegalOrderKey”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_IllegalOrderKey; OWNER=engine; UPDATED=2025-09-24
// CANARY: REQ=REQ-GQL-017; FEATURE=“Transport Parity CASE 3VL”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_017_TransportParity_Case3VL; OWNER=engine; UPDATED=2025-09-24</li>
<li>Null ordering policy: implementation-defined default; see Requirements — binary collation, nulls-last policy (flagger exposed).
// CANARY: REQ=REQ-GQL-024; FEATURE=“Nulls-Last Ordering Parity”; ASPECT=Docs; STATUS=TESTED; TEST=TestCANARY_REQ_GQL_024_TransportParity_NullsLastOrder; OWNER=engine; UPDATED=2025-09-24</li>
<li>UA005/UA006 (bounded path tie-break determinism): Shorter paths preferred; ties broken deterministically by bound IDs and JSON-lex row key. Transport-parity enforced by tests.</li>
</ul>
<h3 id="safety-guards-execution-limits" class="position-relative d-flex align-items-center group">
<span>Safety Guards (Execution Limits)</span>
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</h3><p>The engine enforces protective upper bounds during MATCH evaluation to prevent excessive memory or time consumption. These are implementation-defined and surfaced via diagnostics (ExecutionGuardTrip) when tripped; partial results MAY be returned (truncated) per STEAL/NO-FORCE policy while maintaining deterministic ordering of emitted rows.</p>
<ul>
<li>Default <code>max_results</code>: 100,000 (bindings)</li>
<li>Default <code>max_frontier</code>: 100,000 (active frontier nodes / partial paths in BFS)</li>
<li>Default <code>max_hops_limit</code>: 64</li>
<li>Diagnostic code: <code>ExecutionGuardTrip</code></li>
<li>Policy: Guard trip preserves already produced bindings and sets deterministic ordering</li>
</ul>
<p>// CANARY: REQ=REQ-GQL-017; FEATURE=“MatchSafetyGuardsPolicy”; ASPECT=Docs; STATUS=TESTED; TEST=geodetestlab/specs/gql_pattern_matching_comprehensive.yml; TEST=TestCANARY_REQ_GQL_017_MatchGuardTrips; OWNER=engine; UPDATED=2025-09-25
// CANARY: REQ=REQ-GQL-017; FEATURE=“MatchFrontierGuard”; ASPECT=Docs; STATUS=TESTED; TEST=geodetestlab/specs/gql_pattern_matching_comprehensive.yml; TEST=TestCANARY_REQ_GQL_017_MatchGuardTrips; OWNER=engine; UPDATED=2025-09-25
// CANARY: REQ=REQ-GQL-017; FEATURE=“MatchResultGuard”; ASPECT=Docs; STATUS=TESTED; TEST=geodetestlab/specs/gql_pattern_matching_comprehensive.yml; TEST=TestCANARY_REQ_GQL_017_MatchGuardTrips; OWNER=engine; UPDATED=2025-09-25</p>
<h3 id="flagger" class="position-relative d-flex align-items-center group">
<span>Flagger</span>
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</h3><ul>
<li>I:IllegalOrderKeyPolicy=ident-only</li>
<li>U:US001=enforced</li>
<li>U:OrderTiebreak=LexJSON</li>
<li>U:PathTieBreak=UA005/UA006</li>
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<h3 id="implementation-defined" class="position-relative d-flex align-items-center group">
<span>Implementation-defined</span>
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</h3><ul>
<li>Default collation: binary; Unicode collation optional.</li>
<li>Null ordering policy: default nulls-last; nulls-first via env override.</li>
</ul>
<h3 id="wire-mapping-executionguardtrip-additional-status" class="position-relative d-flex align-items-center group">
<span>Wire Mapping: ExecutionGuardTrip Additional Status</span>
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</h3><p>// CANARY: REQ=REQ-GQL-017; FEATURE=“MatchGuardStatusWireMapping”; ASPECT=Docs; STATUS=TESTED; TEST=geodetestlab/specs/gql_pattern_matching_comprehensive.yml; TEST=TestCANARY_REQ_GQL_017_MatchGuardStatusWireMapping; OWNER=engine; UPDATED=2025-09-24
When a safety guard trips during MATCH evaluation (result/frontier/hops), the server emits primary success frames with <code>status_class</code> <code>00000</code> and includes <code>ExecutionGuardTrip</code> inside the <code>additional_statuses</code> array of the <code>SchemaDefinition</code> frame and (for redundancy) the first <code>DataPage</code> frame. This indicates a partial result truncation event without elevating to an error-class status. Clients SHOULD surface a warning and MAY retry with adjusted guard thresholds. No change to exit codes (remain 0).</p>
<h4 id="environment-overrides-test--diagnostics" class="position-relative d-flex align-items-center group">
<span>Environment Overrides (Test / Diagnostics)</span>
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</h4><p>Guard threshold overrides (test/support use only):</p>
<ul>
<li>CLI (preferred for determinism):
<ul>
<li><code>geode serve --match-max-results <N></code> lowers the <code>max_results</code> guard at process start.</li>
<li><code>geode serve --match-max-frontier <N></code> lowers the <code>max_frontier</code> guard at process start.</li>
</ul>
</li>
<li>Environment (legacy/fallback): <code>GEODE_MATCH_MAX_RESULTS</code> and <code>GEODE_MATCH_MAX_FRONTIER</code> may still be set; if both CLI and env are provided, the CLI flags win.</li>
</ul>
<p>Production deployments SHOULD leave these unset (defaults: 100,000). Frames emitted under overridden thresholds still carry the additional status for transparency.</p>
GQL Conformance Profile
ISO/IEC 39075:2024 GQL conformance profile for Geode documenting implementation-defined ordering, pagination, and diagnostics.