Changelog

Version 0.6.0 (Current Stable)

Changed Flink version to 1.9.3
Temporal Pattern Matching using Temporal-GDL added
Temporal verify operator added
More Gelly-based algorithms are available for TemporalGraph
Min and Max aggregations can now applied on date and datetime types
Duration aggregations have now an optional unit parameter to define a time unit (e.g., Minutes)
Indexed CSV Source/Sink added (also for temporal graphs)
Some bugfixes in MinimalCSVImporter

Version 0.5.2

Improved testing and stability
Improved gdl error handling
Added basic vertex deduplication
Implemented distributed graph layouting
Moved capf into new repository gradoop-capf
Improved temporal graph handling

Version 0.5.1

gradoop-temporal module added
- Temporal Property Graph Model (TPGM) implementation
- diff and snapshot operators for TPGM
- some commonly used temporal predicates
- examples for temporal operator usages
- equals and print support
- support for generified operators
Fixed bug in cypher constructor patterns
Reorganized hbase dependency
- Remove hbase dependencies from gradoop-flink
Fixed incorrectly escaped chars in DOT output
Added overwrite parameter for CSV output
Added new grouping operator using key functions (KeyedGrouping`)
- Added key functions for grouping on temporal infos

Version 0.5.0

API Changes - Interfaces EPGMEdge, EPGMVertex, EPGMGraphHead renamed to Edge, Vertex and GraphHead
API Changes - Instance classes Edge, Vertex and GraphHead renamed to EPGMEdge, EPGMVertex, EPGMGraphHead
Logical Graph Operators generalized
Graph Collection operators generalized
VerifyGraph(s)Containment operator added
gradoop-examples module is refactored
ElementFactories are now part of the BaseFactory (not part of config)
Enhanced comparison of property values
Deprecated JSON source and sink removed
Support for Maven 3.6

Version 0.4.5

Upgrade Flink dependency from 1.7.0 to 1.7.2
Integration of Cypher on Apache Flink (CAPF) to support cypher queries
Improvement of CSVDataSource
Added Graph ETL operators to module gradoop-data-integration
Added Degree Centrality operator
Added Random Walk operator
Added Verify operator to remove dangling edges
Refactored PropertyValue class according to strategy pattern
Added overwrite support for HBaseDataSink

Version 0.4.4

Upgrade Flink dependency from 1.6.0 to 1.7.0
Generalized Subgraph, Transformation and Property Transformation operators
Generalized MetaData construct
Refactored GradoopId to no longer use MongoDB
Added RollUp example
Added support to construct GraphCollection from mutliple LogicalGraphs
Added simple importers for CSV and JSON files

Version 0.4.3

Upgrade Flink dependency from 1.5.0 to 1.6.0
gradoop-data-integration module added
Fixed bugs in IndexedCSVDataSink
Sampling Benchmarks added
Datagen-package removed from Gradoop
Clustering coefficient computation addded
Triangle counting added
Rollup-Operator added
Unified aggregate functions now applicable to both aggregate and grouping operator

Location of LogicalGraph and GraphCollection changed! Through a refactoring, the location of the classes LogicalGraph and GraphCollection has changed from package org.gradoop.flink.model.api.epgm to org.gradoop.flink.model.impl.epgm.

Version 0.4.2

PageRank sampling added
Mockito added for testing support
Multiple aggregation functions in a single aggregation operator
GraphCollection support for CSV Source/Sink
LGTM code quality badge
PropertyTransformation operator added
Weakly Connected Components runner added
CSV delimiter escaping

CSV format changed! Through the newly added graph collection support for CSVDataSource/Sink and IndexedCSVDataSource/Sink, existing graphs created by these sinks from a previous release have to be transformed into the new representation. A GradoopFormatConverter is available in the gradoop-examples package to do this conversion. Use parameter lgcsv (for graphs created by the CSVDataSink) or lgindexed (for graphs created by the IndexedCSVDataSink) as input format and csv or indexed as output format. The outdated sources and sinks are renamed as LogicalGraphCSVDataSource and LogicalGraphCSVDataSink and will be removed in version 0.5.0.