v1.0.0

Major Features and Improvements

• [Enterprise Ed.] Exposed authentication username/rolename regex as a flag

  (--auth-user-or-role-name-regex).

• [Enterprise Ed.] Improved auth module error handling and added support for

  relative paths.

• Added support for Python query modules. This release of Memgraph supports

  query modules written using the already existing C API and the new Python

  API.

• Added support for unique constraints. The unique constraint is created with a

  label and one or more properties.

• Implemented support for importing CSV files (mg_import_csv). The importer

  is compatible with the Neo4j batch CSV importer.

• Snapshot and write-ahead log format changed (backward compatible with v0.50).

• Vertices looked up by their openCypher ID (MATCH (n) WHERE ID(n) = ...)

  will now find the node in O(logn) instead of O(n).

• Improved planning of BFS expansion, a faster, specific approach is now

  favored instead of a ScanAll+Filter operation.

• Added syntax for limiting memory of CALL.

• Exposed server name that should be used for Bolt handshake as flag

  (--bolt-server-name-for-init).

• Added several more functions to the query module C API.

• Implemented a storage locking mechanism that prevents the user from

  concurrently starting two Memgraph instances with the same data directory.

Bug Fixes and Other Changes

• [Enterprise Ed.] Fixed a bug that crashed the database when granting

  privileges to a user.

• [Enterprise Ed.] Improved Louvain algorithm for community detection.

• Type of variable expansion is now printed in EXPLAIN (e.g. ExpandVariable,

  STShortestPath, BFSExpand, WeightedShortestPath).

• Correctly display CALL in EXPLAIN output.

• Correctly delimit arguments when printing the signature of a query module.

• Fixed a planning issue when CALL preceded filtering.

• Fixed spelling mistakes in the storage durability module.

• Fixed storage GC indices/constraints subtle race condition.

• Reduced memory allocations in storage API and indices.

• Memgraph version is now outputted to stdout when Memgraph is started.

• Improved RPM packaging.

• Reduced number of errors reported in production log when loading query

  modules.

• Removed early access wording from the Community Offering license.

v0.50.0

Breaking Changes

• [Enterprise Ed.] Remove support for Kafka streams.

• Snapshot and write-ahead log format changed (not backward compatible).

• Removed support for unique constraints.

• Label indices aren't created automatically, create them explicitly instead.

• Renamed several database flags. Please see the configuration file for a list of current flags.

Major Features and Improvements

• [Enterprise Ed.] Add support for auth module.

• [Enterprise Ed.] LDAP support migrated to auth module.

• Implemented new graph storage engine.

• Add support for disabling properties on edges.

• Add support for existence constraints.

• Add support for custom openCypher procedures using a C API.

• Support loading query modules implementing read-only procedures.

• Add CALL <procedure> YIELD <result> syntax for invoking loaded procedures.

• Add CREATE INDEX ON :Label for creating label indices.

• Add DROP INDEX ON :Label for dropping label indices.

• Add DUMP DATABASE clause to openCypher.

• Add functions for treating character strings as byte strings.

Bug Fixes and Other Changes

• Fix several memory management bugs.

• Reduce memory usage in query execution.

• Fix bug that crashes the database when EXPLAIN is used.

v0.15.0

Breaking Changes

• Snapshot and write-ahead log format changed (not backward compatible).

• indexInfo() function replaced with SHOW INDEX INFO syntax.

• Removed support for unique index. Use unique constraints instead.

• CREATE UNIQUE INDEX ON :label (property) replaced with CREATE CONSTRAINT ON (n:label) ASSERT n.property IS UNIQUE.

• Changed semantics for COUNTER openCypher function.

Major Features and Improvements

• [Enterprise Ed.] Add new privilege, STATS for accessing storage info.

• [Enterprise Ed.] LDAP authentication and authorization support.

• [Enterprise Ed.] Add audit logging feature.

• Add multiple properties unique constraint which replace unique indices.

• Add SHOW STORAGE INFO feature.

• Add PROFILE clause to openCypher.

• Add CREATE CONSTRAINT clause to openCypher.

• Add DROP CONSTRAINT clause to openCypher.

• Add SHOW CONSTRAINT INFO feature.

• Add uniformSample function to openCypher.

• Add regex matching to openCypher.

Bug Fixes and Other Changes

• Fix bug in query comment parsing.

• Fix bug in query symbol table.

• Fix OpenSSL memory leaks.

• Make authentication case insensitive.

• Remove COALESCE function.

• Add movie tutorial.

• Add backpacking tutorial.

v0.14.1

Bug Fixes and Other Changes

• Fix bug in explicit transaction handling.

• Fix bug in edge filtering by edge type and destination.

v0.14.0

Breaking Changes

• Write-ahead log format changed (not backward compatible).

Major Features and Improvements

• [Enterprise Ed.] Reduce memory usage in distributed usage.

• Add DROP INDEX feature.

• Improve SSL error messages.

Bug Fixes and Other Changes

• [Enterprise Ed.] Fix issues with reading and writing in a distributed query.

• Correctly handle an edge case with unique constraint checks.

• Fix a minor issue with mg_import_csv.

• Fix an issue with EXPLAIN.

v0.13.0

Breaking Changes

• Write-ahead log format changed (not backward compatible).

• Snapshot format changed (not backward compatible).

Major Features and Improvements

• [Enterprise Ed.] Authentication and authorization support.

• [Enterprise Ed.] Kafka integration.

• [Enterprise Ed.] Support dynamic worker addition in distributed.

• Reduce memory usage and improve overall performance.

• Add CREATE UNIQUE INDEX clause to openCypher.

• Add EXPLAIN clause to openCypher.

• Add inDegree and outDegree functions to openCypher.

• Improve BFS performance when both endpoints are known.

• Add new node-label, relationship-type and quote options to

  mg_import_csv tool.

• Reduce memory usage of mg_import_csv.

Bug Fixes and Other Changes

• [Enterprise Ed.] Fix an edge case in distributed index creation.

• [Enterprise Ed.] Fix issues with Cartesian in distributed queries.

• Correctly handle large messages in Bolt protocol.

• Fix issues when handling explicitly started transactions in queries.

• Allow openCypher keywords to be used as variable names.

• Revise and make user visible error messages consistent.

• Improve aborting time consuming execution.

v0.12.0

Breaking Changes

• Snapshot format changed (not backward compatible).

Major Features and Improvements

• Improved Id Cypher function.

• Added string functions to openCypher (lTrim, left, rTrim, replace,

  reverse, right, split, substring, toLower, toUpper, trim).

• Added timestamp function to openCypher.

• Added support for dynamic property access with [] operator.

v0.11.0

Major Features and Improvements

• [Enterprise Ed.] Improve Cartesian support in distributed queries.

• [Enterprise Ed.] Improve distributed execution of BFS.

• [Enterprise Ed.] Dynamic graph partitioner added.

• Static nodes/edges id generators exposed through the Id Cypher function.

• Properties on disk added.

• Telemetry added.

• SSL support added.

• toString function added.

Bug Fixes and Other Changes

• Document issues with Docker on OS X.

• Add BFS and Dijkstra's algorithm examples to documentation.

v0.10.0

Breaking Changes

• Snapshot format changed (not backward compatible).

Major Features and Improvements

• [Enterprise Ed.] Distributed storage and execution.

• reduce and single functions added to openCypher.

• wShortest edge expansion added to openCypher.

• Support packaging RPM on CentOS 7.

Bug Fixes and Other Changes

• Report an error if updating a deleted element.

• Log an error if reading info on available memory fails.

• Fix a bug when MATCH would stop matching if a result was empty, but later

  results still contain data to be matched. The simplest case of this was the

  query: UNWIND [1,2,3] AS x MATCH (n :Label {prop: x}) RETURN n. If there

  was no node (:Label {prop: 1}), then the MATCH wouldn't even try to find

  for x being 2 or 3.

• Report an error if trying to compare a property value with something that

  cannot be stored in a property.

• Fix crashes in some obscure cases.

• Commit log automatically garbage collected.

• Add minor performance improvements.

v0.9.0

Breaking Changes

• Snapshot format changed (not backward compatible).

• Snapshot configuration flags changed, general durability flags added.

Major Features and Improvements

• Write-ahead log added.

• nodes and relationships functions added.

• UNION and UNION ALL is implemented.

• Concurrent index creation is now enabled.

Bug Fixes and Other Changes

v0.8.0

Major Features and Improvements

• CASE construct (without aggregations).

• Named path support added.

• Maps can now be stored as node/edge properties.

• Map indexing supported.

• rand function added.

• assert function added.

• counter and counterSet functions added.

• indexInfo function added.

• collect aggregation now supports Map collection.

• Changed the BFS syntax.

Bug Fixes and Other Changes

• Use \u to specify 4 digit codepoint and \U for 8 digit

• Keywords appearing in header (named expressions) keep original case.

• Our Bolt protocol implementation is now completely compatible with the protocol version 1 specification. (https://boltprotocol.org/v1/)

• Added a log warning when running out of memory and the memory_warning_threshold flag

• Edges are no longer additionally filtered after expansion.

v0.7.0

Major Features and Improvements

• Variable length path MATCH.

• Explicitly started transactions (multi-query transactions).

• Map literal.

• Query parameters (except for parameters in place of property maps).

• all function in openCypher.

• degree function in openCypher.

• User specified transaction execution timeout.

Bug Fixes and Other Changes

• Concurrent BUILD INDEX deadlock now returns an error to the client.

• A MATCH preceeded by OPTIONAL MATCH expansion inconsistencies.

• High concurrency Antlr parsing bug.

• Indexing improvements.

• Query stripping and caching speedups.

v0.6.0

Major Features and Improvements

• AST caching.

• Label + property index support.

• Different logging setup & format.

v0.5.0

Major Features and Improvements

• Use label indexes to speed up querying.

• Generate multiple query plans and use the cost estimator to select the best.

• Snapshots & Recovery.

• Abandon old yaml configuration and migrate to gflags.

• Query stripping & AST caching support.

Bug Fixes and Other Changes

• Fixed race condition in MVCC. Hints exp+aborted race condition prevented.

• Fixed conceptual bug in MVCC GC. Evaluate old records w.r.t. the oldest.

  transaction's id AND snapshot.

• User friendly error messages thrown from the query engine.

Build 837

Bug Fixes and Other Changes

• List indexing supported with preceeding IN (for example in query RETURN 1 IN [[1,2]][0]).

Build 825

Major Features and Improvements

• RETURN , count(), OPTIONAL MATCH, UNWIND, DISTINCT (except DISTINCT in aggregate functions), list indexing and slicing, escaped labels, IN LIST operator, range function.

Bug Fixes and Other Changes

• TCP_NODELAY -> import should be faster.

• Clear hint bits.

Build 783

Major Features and Improvements

• SKIP, LIMIT, ORDER BY.

• Math functions.

• Initial support for MERGE clause.

Bug Fixes and Other Changes

• Unhandled Lock Timeout Exception.