HeliosDB Full v7.4.0 Release Notes

Theme: SQL surfaces for graph + hybrid search, plus a native MCP server

Highlights

v7.4.0 brings new SQL-level access to capabilities that previously required Cypher or low-level vector APIs, and introduces HeliosDB Full’s first native Model Context Protocol (MCP) server.

What’s New

Graph SQL Surface

Existing graph engines are now accessible from SQL:

SELECT * FROM graph_traverse(
  start_node => 'uuid-here',
  edge_label => 'KNOWS',
  direction  => 'OUT',
  depth      => 3
);

SELECT * FROM graph_shortest_path(
  from_node => 'uuid-a',
  to_node   => 'uuid-b',
  algorithm => 'astar',
  weight_col => 'distance'
);

Cypher and ISO GQL support continues unchanged for advanced graph queries.

Hybrid Search SQL Surface

Existing full-text and hybrid-search capabilities now have a SQL surface:

SELECT * FROM hybrid_search(
  table_name   => 'documents',
  query_text   => 'distributed database research',
  query_vector => embed('distributed database research'),
  vector_column=> 'embedding',
  text_column  => 'content',
  fusion       => 'rrf',
  limit        => 50
);

RRF, MMR, and Linear fusion are now standardized.

Compiled Plans

PREPARE COMPILED report_query AS
  SELECT customer_id, sum(amount) FROM transactions
  WHERE created_at >= $1 GROUP BY customer_id;

EXECUTE report_query('2026-01-01');

LRU-cached plans skip parsing/planning. Distinct from the existing distributed query optimizer — this is local plan caching for repeat single-node execution.

Native MCP Server

Native MCP (Model Context Protocol) support comes to Full. 29 tools total:

Inherited from Nano baseline (10):

heliosdb_query, heliosdb_schema, heliosdb_list_tables, heliosdb_create_table, heliosdb_insert
heliosdb_branch_create, heliosdb_branch_list, heliosdb_branch_merge
heliosdb_search, heliosdb_time_travel

New in v7.4.0 (Full-only):

heliosdb_cypher_query — Cypher queries
heliosdb_nl2sql — natural-language-to-SQL
heliosdb_lakehouse_query — query Iceberg/Delta tables
heliosdb_index_advisor — get autonomous index recommendations
heliosdb_hybrid_search / heliosdb_graph_traverse / heliosdb_graph_path
heliosdb_embed_and_store -…and more

Migration

No breaking changes. v7.4.0 is fully wire-compatible with v7.3.x. Existing Cypher queries, distributed plans, and protocol adapters are unaffected.