Neo4j 2.0 Community changelog - Mats-SX/neo4j GitHub Wiki

###2.0.3 Cypher:

  • MERGE must fail when trying to create 2 nodes with same id but different labels (e.g., MERGE (a: Foo)-[r:KNOWS]->(a: Bar))
  • Allow Cypher split() with empty separator
  • Ensure Cypher range() works with negative step values

Kernel:

  • Fixes a deadlock issue in the page cache
  • Fix a transaction log issue where the log could be written to after tx manager marked as NOT_OK.
  • Performance improvements for concurrent reads

###2.0.2 Cypher:

  • Fixes #1897 - goes into never ending loop for some aggregate queries
  • Add the functions toInt(...) and toFloat(...)
  • Renames the Cypher type Double to Float
  • Add the function split(...)
  • Reading a non-existent property from a map returns null rather than failing
  • MERGE will choose a direction when it has to create a relationship if you use an undirected relationship pattern

Kernel:

  • Fixes an issue with tx log reading in severely damaged log files.
  • Fixes a JVM deadlock issue between committing and a reading thread
  • Can now handle more gracefully a larger set of failed index states
  • Logical logs are now kept, by default, for 7 days to make backup more likely to choose incremental.
  • Fixes issue where store migration forgets about legacy indexes
  • Datasource specific transaction application now respects global TM state
  • Fix a cache poisoning issue where large properties would keep a reference to a closed store after a HA role switch. Manifested as NullPointerException when reading very large properties in rare cases.
  • Fixes an issue where indexes that have been dropped would fail recovery if commands to activate them were run in recovery.
  • Fixes byte count monitoring
  • Fixes issue with proper update of indexes that came from improper command execution order
  • Fixes memory leak in XaResourceManager that could lead recovered transaction application to delay noticeably
  • Fixes null pointer exceptions coming from LazyProperties being half loaded while a datasource restart happens

Server:

  • Fixes github issues #1872, #961 that deal with Content-Encoding headers
  • Server log and messages.log now share common formatting. Achieved through the use of the same logging framework

###2.0.1 (2014-01-04) Kernel:

  • Improve speed of verifying unique constraints on constraint creation.
  • Improve speed of creating label scan store in BatchInserter.
  • Fixes issue with batch inserter which could lead to record not in use exception when adding properties
  • Introduces monitoring for reads/writes to the logical log

Server:

  • Fixes issue with transactions leaking when there is an exception while rendering the response

Cypher:

  • Fixes bug around MERGE inside a FOREACH inside a FOREACH
  • Makes it possible to write MERGE queries with no already known parts
  • Fixes problem with compiling queries with NOT expressions in them
  • Fixes #1735 - Indexes and AND predicates produce wrong results
  • Fixes #1876 - Null nodes and properties should be ignored when SETting properties
  • Fixes problem with parser not being thread safe. State is bad, m'kay?
  • Add support for double literals in exponent form
  • Use internal heirarchy for types. Previously dependeded on Scala type hierarchy
  • Fixes MERGE without any identifier previously known
  • Corrects numerous inconsistencies when performing static type inference during compilation.

###2.0.0 (2013-12-11) Cypher:

  • Fix for problem with index lookups against properties
  • Fix: MERGE should work when finding multiple elements
  • Fix: Should support updates for merging
  • Fix issue when mixing Cypher queries of different versions
  • Fix problems with CREATE for relationships without declared nodes
  • Allow MERGE to run inside FOREACH
  • Prevent the use of parameter maps in MATCH and MERGE

###2.0.0-RC1 (2013-11-21) Kernel:

  • BREAKING CHANGE: Reference node has been removed.
  • BREAKING CHANGE: All classes under the org.neo4j.kernel package space, except those related to the traversal frameworks, are now deprecated and due to be moved into internal packages. This includes well-known classes such as EmbeddedGraphDatabase and HighlyAvailableGraphDatabase, both of which are replaced by GraphDatabaseFactory and HighlyAvailableGraphDatabaseFactory, respectively.
  • BREAKING CHANGE: Removed deprecated settings from org.neo4j.graphdb.factory.GraphDatabaseSettings. These settings are no longer effective and can be removed without any effect.
  • BREAKING CHANGE: Removed deprecated org.neo4j.graphdb.index.IndexProvider (and associated org.neo4j.graphdb.index.IndexIterable and org.neo4j.graphdb.index.IndexProviderKernelExtensionFactory). This has been replaced by the kernel extension mechanism.
  • BREAKING CHANGE: Removed deprecated org.neo4j.graphdb.PropertyContainer#getPropertyValues(). Instead use org.neo4j.graphdb.PropertyContainer#getPropertyKeys() and org.neo4j.graphdb.PropertyContainer#getProperty(String).
  • BREAKING CHANGE: Removed deprecated methods from org.neo4j.kernel.GraphDatabaseAPI: #getDiagnosticsManager(), #getMessageLog(), #getIdGeneratorFactory(), #getKernelData() and #getPersistenceSource(). These are internal components which Kernel clients should not need to access. The entire org.neo4j.kernel.GraphDatabaseAPI interface is deprecated and will be removed in future.
  • BREAKING CHANGE: Deprecated constructors of EmbeddedReadOnlyDatabase and EmbeddedGraphDatabase have been removed, in favor of the long-advertised alternative GraphDatabaseFactory.
  • BREAKING CHANGE: All deprecated methods in GraphDatabaseAPI have been removed in favor of getDependencyResolver().

Cypher:

  • Add OPTIONAL MATCH to Cypher
  • Remove question mark symbol from patterns in Cypher
  • Fixes 1313
  • Fixes problem with collection index types
  • Changes behaviour of LAST/HEAD/TAIL and collection slice - they now all return null for ranges outside a collection
  • Fixed #1471 - SETting a relationship to a map value fails

Shell:

  • Add '-' as filename for piping stdin directly into the shell, behaves as a file import.

Server:

  • BREAKING CHANGE: Removed deprecated method org.neo4j.server.AbstractNeoServer#stopServerOnly(). To stop the server use org.neo4j.server.AbstractNeoServer#stop(). If you would like to disconnect the database life cycle from server control use org.neo4j.server.WrappingNeoServer.
  • BREAKING CHANGE: org.neo4j.server.database.Database is now an interface. Direct uses of the class can be replaced by one of its implementations.
  • Transactional endpoint status codes are now textual rather than numeric. Since the transactional endpoint was introduced in the 2.0.0 series, it is not considered a breaking change. It will, however, require modifying client code that depends on the numeric status codes.

###2.0.0-M06 (2013-10-15)

  • Windows desktop GUI added

Cypher:

  • Parenthesis around nodes are now mandatory if a label is used on the node

###2.0.0-M05 (2013-09-10) Kernel:

  • BREAKING CHANGE: GraphDatabaseSettings now only exposes Setting, deprecated settings classes have been removed.
  • Fixed problems with array properties being updated multiple times in a single transaction
  • Adds label store as an index
  • Transaction now implements AutoClosable
  • Distinguish between data and schema transactions
  • Unique constraint validation for new data

Cypher:

  • Promote the experimental parser to the default
  • Added literal maps
  • Makes RETURN only queries valid
  • Labels on optional nodes no longer stop the whole MATCH clause from returning results.
  • Updated NOT precedence
  • Added collection slice and collection index
  • Added list comprehension documentation

Shell:

  • Adds support for RETURN only Cypher queries

###2.0.0-M04 (2013-08-08) Kernel:

  • BREAKING CHANGE: Require Java 7
  • BREAKING CHANGE: Transactions are now required for all operations throughout Java Core API, read operations as well as write operations
  • Define proper equality for indexing of array properties
  • BREAKING CHANGE: Equality for indexing of number properties compares numbers independent of underlying primitive Java type

Cypher:

  • Fixes #844 - Label predicate do not work on optional nodes that are null
  • Fixes #897 - Cypher start doesnt allow combining multiple starting points with start node sets
  • BREAKING CHANGE: Removes "?", "!" syntax for accessing properties. Missing properties are now treated as null
  • Introduced a new experimental and fast PEG parser
  • BREAKING CHANGE: Escaped identifiers in the RETURN clause are kept as the user entered them
  • BREAKING CHANGE: No longer possible to use expressions and params to identify nodes in patterns
  • BREAKING CHANGE: Use "|" in favor of ":" in FOREACH, EXTRACT and REDUCE to avoid disambiguity with label syntax

Cypher:

  • Fixes a concurrency problem in query parser

Server:

  • Added support for extracting and returning the graph structure from the result of a Cypher query executed via the transactional endpoint

###2.0.0-M03 (2013-05-29) Kernel:

  • Read-only index results are closed properly

Cypher:

  • Make Cypher execution results closable
  • Adds Cypher label scan hint
  • Removes alternative WITH syntax in Cypher
  • Fixes bug with UNION text output
  • Added startNode()/endNode()
  • Fixes #780 - Queries with literal collections fail against schema indexes

Server:

  • Added support for transaction keep-alive

###2.0.0-M02 (2013-04-28)

  • In server, added REST transaction support
  • In cypher, added MERGE clause
  • In cypher, MATCH now supports single-node patterns
  • In shell, support for listing indexes and their state
  • Support for labels in the org.neo4j.unsafe.batchinsert APIs.
  • BREAKING CHANGE: Replaced protected fields from org.neo4j.graphdb.factory.GraphDatabaseFactory with a single org.neo4j.graphdb.factory.GraphDatabaseFactoryState instance to avoid race conditions when creating multiple, lazily instantiated builders
  • BREAKING CHANGE: org.neo4j.graphdb.index.BatchInserterIndex and org.neo4j.graphdb.index.BatchInserterIndexProvider has been removed in favor of the same interfaces available in org.neo4j.unsafe.batchinsert
  • BREAKING CHANGE: The BatchInserter and the BatchGraphDatabase are not binary compatible with 1.9 due to some methods now taking a varargs array of labels as last argument. Please recompile any code that depends on the BatchInserter.

###2.0.0-M01 (2013-04-08)

  • Added support for labels across all APIs: Cypher, Core Java and REST
  • Added support for the new label-based indexes across all APIs: Cypher, Core Java and REST
  • Improvements to shell, including import/export of small graphs via cypher statements

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