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CHANGELOG.md
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CHANGELOG.md
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# Change Log
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Change Log for all versions of Memgraph can be found on-line at
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https://docs.memgraph.com/memgraph/changelog
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## v1.5.0
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All the updates to the Change Log can be made in the following repository:
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https://github.com/memgraph/docs
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### Major Feature and Improvements
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* Added triggers.
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* Replaced mg_client with mgconsole
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### Bug Fixes
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* Fixed parsing of types for Python procedures for types nested in `mgp.List`.
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For example, parsing of `mgp.List[mgp.Map]` works now.
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* Fixed memory tracking issues. Some of the allocation and deallocation weren't
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tracked during the query execution.
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* Fixed reading CSV files that are using CRLF as the newline symbol.
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* Fixed permission issues for `LOAD CSV`, `FREE MEMORY`, `LOCK DATA DIRECTORY`,
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and replication queries.
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## v1.4.0
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### Breaking Changes
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* Changed `MEMORY LIMIT num (KB|MB)` clause in the procedure calls to `PROCEDURE MEMORY LIMIT num (KB|MB)`.
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The functionality is still the same.
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### Major Feature and Improvements
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* Added replication to community version.
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* Added support for multiple query modules directories at the same time.
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You can now define multiple, comma-separated paths to directories from
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which the modules will be loaded using the `--query-modules-directory` flag.
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* Added support for programatically reading in data from CSV files through the
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`LOAD CSV` clause. We support CSV files with and without a header, the
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supported dialect being Excel.
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* Added a new flag `--memory-limit` which enables the user to set the maximum total amount of memory
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memgraph can allocate during its runtime.
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* Added `FREE MEMORY` query which tries to free unusued memory chunks in different parts of storage.
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* Added the memory limit and amount of currently allocated bytes in the result of `SHOW STORAGE INFO` query.
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* Added `QUERY MEMORY LIMIT num (KB|MB)` to Cypher queries which allows you to limit memory allocation for
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the entire query. It can be added only at the end of the entire Cypher query.
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* Added logs for the different parts of the recovery process. `INFO`, `DEBUG` and `TRACE` level all contain
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additional information that is printed out while the recovery is in progress.
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### Bug Fixes
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* Fixed garbage collector by correctly marking the oldest current timestamp
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after the database was recovered using the durability files.
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* Fixed reloading of the modules with changed result names.
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* Fixed profile query to show the correct name of the ScanAll operator variant.
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## v1.3.0
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### Breaking Changes
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* Added extra information in durability files to support replication, making it
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incompatible with the durability files generated by older versions of
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Memgraph. Even though the replication is an Enterprise feature, the files are
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compatible with the Community version.
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### Major Features and Improvements
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* Added support for data replication across a cluster of Memgraph instances.
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Supported instance types are MAIN and REPLICA. Supported replication modes
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are SYNC (all SYNC REPLICAS have to receive data before the MAIN can commit
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the transaction), ASYNC (MAIN doesn't care if data is replicated), SYNC WITH
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TIMEOUT (MAIN will wait for REPLICAS within the given timeout period, after
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timout, replication isn't aborted but the replication demotes the REPLICA to
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the ASYNC mode).
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* Added support for query type deduction. Possible query types are `r` (read),
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`w` (write), `rw` (read-write). The query type is returned as a part of the
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summary.
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* Improved logging capabilities by introducing granular logging levels. Added
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new flag, `--log-level`, which specifies the minimum log level that will be
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printed. E.g., it's possible to print incoming queries or Bolt server states.
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* Added ability to lock the storage data directory by executing the `LOCK DATA
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DIRECTORY;` query which delays the deletion of the files contained in the
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data directory. The data directory can be unlocked again by executing the
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`UNLOCK DATA DIRECTORY;` query.
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### Bug Fixes and Other Changes
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* Added cleanup of query executions if not in an explicit transaction.
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* Fix RPC dangling reference.
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## v1.2.0
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### Breaking Changes
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* SSL is disabled by default (`--bolt-cert-file` and `--bolt-key-file` are
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empty). This change might only affect the client connection configuration.
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### Major Features and Improvements
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* Added support for Bolt v4.0 and v4.1.
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* Added `mgp_networkx.py` as an alternative implementation of NetworkX graph
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objects, which is useful to use Memgraph data from NetworkX algorithms
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optimally.
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* Added `nxalg.py` query module as a proxy to NetworkX algorithms.
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* Added plan optimization to use a label-property index where the property is
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not null. As a result, the query engine, instead of scanning all elements and
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applying the filter, performs a label-property index lookup when possible.
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### Bug Fixes and Other Changes
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* Fixed Cypher `ID` function `Null` handling. When the `ID` function receives
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`Null`, it will also return `Null`.
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* Fixed bug that caused random crashes in SSL communication on platforms
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that use older versions of OpenSSL (< 1.1) by adding proper multi-threading
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handling.
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* Fix `DISCARD` message handling. The query is now executed before discarding
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the results.
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## v1.1.0
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### Major Features and Improvements
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* Properties in nodes and edges are now stored encoded and compressed. This
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change significantly reduces memory usage. Depending on the specific dataset,
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total memory usage can be reduced up to 50%.
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* Added support for rescanning query modules. Previously, the query modules
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directory was scanned only upon startup. Now it is scanned each time the user
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requests to load a query module. The functions used to load the query modules
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were renamed to `mg.load()` and `mg.load_all()` (from `mg.reload()` and
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`mg.reload_all()`).
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* Improved execution performance of queries that have an IN list filter by
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using label+property indices.
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Example: `MATCH (n:Label) WHERE n.property IN [] ...`
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* Added support for `ANY` and `NONE` openCypher functions. Previously, only
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`ALL` and `SINGLE` functions were implemented.
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### Bug Fixes and Other Changes
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* Fixed invalid paths returned by variable expansion when the starting node and
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destination node used the same symbol.
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Example: `MATCH path = (n:Person {name: "John"})-[:KNOWS*]->(n) RETURN path`
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* Improved semantics of `ALL` and `SINGLE` functions to be consistent with
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openCypher when handling lists with `Null`s.
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* `SHOW CONSTRAINT INFO` now returns property names as a list for unique
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constraints.
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* Escaped label/property/edgetype names in `DUMP DATABASE` to support names
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with spaces in them.
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* Fixed handling of `DUMP DATABASE` queries in multi-command transactions
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(`BEGIN`, ..., `COMMIT`).
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* Fixed handling of various query types in explicit transactions. For example,
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constraints were allowed to be created in multi-command transactions
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(`BEGIN`, ..., `COMMIT`) but that isn't a transactional operation and as such
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can't be allowed in multi-command transactions.
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* Fixed integer overflow bugs in `COUNT`, `LIMIT` and `SKIP`.
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* Fixed integer overflow bugs in weighted shortest path expansions.
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* Fixed various other integer overflow bugs in query execution.
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* Added Marvel Comic Universe tutorial.
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* Added FootballTransfers tutorial.
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## v1.0.0
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### Major Features and Improvements
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* [Enterprise Ed.] Exposed authentication username/rolename regex as a flag
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(`--auth-user-or-role-name-regex`).
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* [Enterprise Ed.] Improved auth module error handling and added support for
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relative paths.
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* Added support for Python query modules. This release of Memgraph supports
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query modules written using the already existing C API and the new Python
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API.
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* Added support for unique constraints. The unique constraint is created with a
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label and one or more properties.
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* Implemented support for importing CSV files (`mg_import_csv`). The importer
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is compatible with the Neo4j batch CSV importer.
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* Snapshot and write-ahead log format changed (backward compatible with v0.50).
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* Vertices looked up by their openCypher ID (`MATCH (n) WHERE ID(n) = ...`)
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will now find the node in O(logn) instead of O(n).
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* Improved planning of BFS expansion, a faster, specific approach is now
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favored instead of a ScanAll+Filter operation.
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* Added syntax for limiting memory of `CALL`.
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* Exposed server name that should be used for Bolt handshake as flag
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(`--bolt-server-name-for-init`).
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* Added several more functions to the query module C API.
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* Implemented a storage locking mechanism that prevents the user from
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concurrently starting two Memgraph instances with the same data directory.
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### Bug Fixes and Other Changes
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* [Enterprise Ed.] Fixed a bug that crashed the database when granting
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privileges to a user.
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* [Enterprise Ed.] Improved Louvain algorithm for community detection.
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* Type of variable expansion is now printed in `EXPLAIN` (e.g. ExpandVariable,
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STShortestPath, BFSExpand, WeightedShortestPath).
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* Correctly display `CALL` in `EXPLAIN` output.
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* Correctly delimit arguments when printing the signature of a query module.
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* Fixed a planning issue when `CALL` preceded filtering.
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* Fixed spelling mistakes in the storage durability module.
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* Fixed storage GC indices/constraints subtle race condition.
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* Reduced memory allocations in storage API and indices.
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* Memgraph version is now outputted to `stdout` when Memgraph is started.
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* Improved RPM packaging.
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* Reduced number of errors reported in production log when loading query
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modules.
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* Removed `early access` wording from the Community Offering license.
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## v0.50.0
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### Breaking Changes
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* [Enterprise Ed.] Remove support for Kafka streams.
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* Snapshot and write-ahead log format changed (not backward compatible).
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* Removed support for unique constraints.
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* Label indices aren't created automatically, create them explicitly instead.
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* Renamed several database flags. Please see the configuration file for a list of current flags.
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### Major Features and Improvements
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* [Enterprise Ed.] Add support for auth module.
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* [Enterprise Ed.] LDAP support migrated to auth module.
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* Implemented new graph storage engine.
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* Add support for disabling properties on edges.
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* Add support for existence constraints.
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* Add support for custom openCypher procedures using a C API.
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* Support loading query modules implementing read-only procedures.
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* Add `CALL <procedure> YIELD <result>` syntax for invoking loaded procedures.
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* Add `CREATE INDEX ON :Label` for creating label indices.
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* Add `DROP INDEX ON :Label` for dropping label indices.
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* Add `DUMP DATABASE` clause to openCypher.
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* Add functions for treating character strings as byte strings.
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### Bug Fixes and Other Changes
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* Fix several memory management bugs.
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* Reduce memory usage in query execution.
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* Fix bug that crashes the database when `EXPLAIN` is used.
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## v0.15.0
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### Breaking Changes
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* Snapshot and write-ahead log format changed (not backward compatible).
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* `indexInfo()` function replaced with `SHOW INDEX INFO` syntax.
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* Removed support for unique index. Use unique constraints instead.
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* `CREATE UNIQUE INDEX ON :label (property)` replaced with `CREATE CONSTRAINT ON (n:label) ASSERT n.property IS UNIQUE`.
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* Changed semantics for `COUNTER` openCypher function.
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### Major Features and Improvements
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* [Enterprise Ed.] Add new privilege, `STATS` for accessing storage info.
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* [Enterprise Ed.] LDAP authentication and authorization support.
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* [Enterprise Ed.] Add audit logging feature.
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* Add multiple properties unique constraint which replace unique indices.
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* Add `SHOW STORAGE INFO` feature.
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* Add `PROFILE` clause to openCypher.
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* Add `CREATE CONSTRAINT` clause to openCypher.
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* Add `DROP CONSTRAINT` clause to openCypher.
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* Add `SHOW CONSTRAINT INFO` feature.
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* Add `uniformSample` function to openCypher.
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* Add regex matching to openCypher.
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### Bug Fixes and Other Changes
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* Fix bug in explicit transaction handling.
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* Fix bug in edge filtering by edge type and destination.
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* Fix bug in query comment parsing.
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* Fix bug in query symbol table.
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* Fix OpenSSL memory leaks.
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* Make authentication case insensitive.
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* Remove `COALESCE` function.
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* Add movie tutorial.
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* Add backpacking tutorial.
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## v0.14.0
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### Breaking Changes
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* Write-ahead log format changed (not backward compatible).
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### Major Features and Improvements
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* [Enterprise Ed.] Reduce memory usage in distributed usage.
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* Add `DROP INDEX` feature.
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* Improve SSL error messages.
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### Bug Fixes and Other Changes
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* [Enterprise Ed.] Fix issues with reading and writing in a distributed query.
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* Correctly handle an edge case with unique constraint checks.
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* Fix a minor issue with `mg_import_csv`.
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* Fix an issue with `EXPLAIN`.
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## v0.13.0
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### Breaking Changes
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||||||
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||||||
* Write-ahead log format changed (not backward compatible).
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||||||
* Snapshot format changed (not backward compatible).
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|
||||||
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|
||||||
### Major Features and Improvements
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|
||||||
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|
||||||
* [Enterprise Ed.] Authentication and authorization support.
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||||||
* [Enterprise Ed.] Kafka integration.
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||||||
* [Enterprise Ed.] Support dynamic worker addition in distributed.
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* Reduce memory usage and improve overall performance.
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* Add `CREATE UNIQUE INDEX` clause to openCypher.
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* Add `EXPLAIN` clause to openCypher.
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* Add `inDegree` and `outDegree` functions to openCypher.
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* Improve BFS performance when both endpoints are known.
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* Add new `node-label`, `relationship-type` and `quote` options to
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`mg_import_csv` tool.
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* Reduce memory usage of `mg_import_csv`.
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|
||||||
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|
||||||
### Bug Fixes and Other Changes
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|
||||||
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|
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* [Enterprise Ed.] Fix an edge case in distributed index creation.
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||||||
* [Enterprise Ed.] Fix issues with Cartesian in distributed queries.
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||||||
* Correctly handle large messages in Bolt protocol.
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* Fix issues when handling explicitly started transactions in queries.
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* Allow openCypher keywords to be used as variable names.
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* Revise and make user visible error messages consistent.
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* Improve aborting time consuming execution.
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## v0.12.0
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|
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### Breaking Changes
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|
||||||
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|
||||||
* Snapshot format changed (not backward compatible).
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||||||
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|
||||||
### Major Features and Improvements
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||||||
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* Improved Id Cypher function.
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* Added string functions to openCypher (`lTrim`, `left`, `rTrim`, `replace`,
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`reverse`, `right`, `split`, `substring`, `toLower`, `toUpper`, `trim`).
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* Added `timestamp` function to openCypher.
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* Added support for dynamic property access with `[]` operator.
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## v0.11.0
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|
||||||
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||||||
### Major Features and Improvements
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|
||||||
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|
||||||
* [Enterprise Ed.] Improve Cartesian support in distributed queries.
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||||||
* [Enterprise Ed.] Improve distributed execution of BFS.
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||||||
* [Enterprise Ed.] Dynamic graph partitioner added.
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* Static nodes/edges id generators exposed through the Id Cypher function.
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* Properties on disk added.
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* Telemetry added.
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* SSL support added.
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* `toString` function added.
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### Bug Fixes and Other Changes
|
|
||||||
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|
||||||
* Document issues with Docker on OS X.
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||||||
* Add BFS and Dijkstra's algorithm examples to documentation.
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||||||
## v0.10.0
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||||||
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||||||
### Breaking Changes
|
|
||||||
|
|
||||||
* Snapshot format changed (not backward compatible).
|
|
||||||
|
|
||||||
### Major Features and Improvements
|
|
||||||
|
|
||||||
* [Enterprise Ed.] Distributed storage and execution.
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|
||||||
* `reduce` and `single` functions added to openCypher.
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|
||||||
* `wShortest` edge expansion added to openCypher.
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|
||||||
* Support packaging RPM on CentOS 7.
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||||||
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|
||||||
### Bug Fixes and Other Changes
|
|
||||||
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|
||||||
* Report an error if updating a deleted element.
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|
||||||
* 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.
|
|
||||||
|
|
||||||
## Build 755
|
|
||||||
|
|
||||||
### Major Features and Improvements
|
|
||||||
|
|
||||||
* MATCH, CREATE, WHERE, SET, REMOVE, DELETE.
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user