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memgraph/CHANGELOG.md
florijan 03c78c1277 BFS syntax changes 
Summary:
- The new BFS syntax implemented as proposed.
- AST BreadthFirstAtom now uses EdgeAtom members: has_range_{true}, upper_bound_, lower_bound_
- Edges data structure now handles all the edge filtering (single or multiple edges), to ease planning. Additional edge filtering (additional Filter op in the plan) is removed. AST EdgeTypeTest is no longer used and is removed.

Current state is stable but there are things left to do:
- BFS property filtering.
- BFS lower_bound_ support.
- Support for lambdas in variable length expansion. This includes obligatory (even if not user_defined) inner_node and inner_edge symbols for easier handling.
- Code-sharing between BFS and variable length expansions.

I'll add asana tasks (and probably start working on them immediately) when/if this lands.

Reviewers: buda, teon.banek, mislav.bradac

Reviewed By: teon.banek

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D836
2017-09-27 16:25:19 +02:00

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Change Log

Next version

Major Features and Improvements

  • CASE construct (without aggregations).
  • Named path support added.
  • Maps can now be stored as vertex/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.