Release 0.13.0

Query Language

• Query Language now support the evaluation of functions as part of a PROJECTION or a PREDICATE clause
• Removed kNN Predicate as a primary language construct. NNS can now be expressed as a combination of FUNCTION execution, ORDER BY and LIMIT. This allows for greater flexibility in terms of queries that can be executed.
• Removed MATCH operator.
• Transaction and query information is now provided in a dedicated Metadata object in every query request.

General

• Improved implementation of SimpleClient, which now provides access to most query language constructs
• TupleIterator now implements Closeable which aborts an ongoing query (no close is required if iterator is drained)
• Added notion of a FunctionRegistry that serves as a lookup facility for functions that can be executed as part of a query.
• Migrated all distance to proper, executable function implementations and adjusted query planner to support execution of NNS queries based on this new facility.

CLI

• There is now a kill command that can be used to abort ongoing transactions.

Bugfixes

• Various improvements related to transaction management and locking.