CHANGELOG.md

0.6 (2017-05-15)

New features

• Select a subset of trails with tdb cli using the --uuids flag.

• Optimized filters that match all events or no events. These can be used to create a (materialized) view over a subset of trails.

• tdb merge supports merging of TrailDBs with mismatching sets of fields. The result is a union of all fields in the source TrailDBs.

• TDB_OPT_CONS_NO_BIGRAMS option for tdb_cons_set_opt to disable bigram-based size optimization. This option can sometimes greatly speed up TrailDB creation at the cost of increased filesize. The flag can also be passed to tdb CLI as --no-bigrams.

• Trail-level options: tdb_set_trail_opt. This is especially useful for creating granular views using TDB_OPT_EVENT_FILTER. See Setting Options.

• Time-range term: query events within a given time-range. This simplifies time-series type analyses of trails. Also expanded the filter inspection API to add functions for counting the number of terms in a clause, inspecting the type of a term, and returning the start and end times of a time-range term.

• Multi-cursors: join trails over multiple TrailDBs efficiently. This is a convenient way to stich together e.g. time-sharded TrailDBs or merge together user profiles stored under separate UUIDs.

• Item index for tdb CLI. This can speed up --filter expressions that access infrequent items significantly.

• Added tdb_event_filter_num_clauses and tdb_event_filter_get_item for reading items and clauses in an existing filter.

• TDB_OPT_EVENT_FILTER option for tdb_set_opt which can be used to create views or materialized views.

• --filter flag for the tdb CLI: Define event filters on the command line for easy grepping of events. Also added --verbose flag for troubleshooting filters.

• tdb merge for tdb CLI. This operation is used to merge multipled tdbs into a single tdb.

• Added a brew package for OS X.

• Added installation instructions for FreeBSD.

Bugfixes

• Make opening single-file tdbs thread-safe.

• Fix handling of empty values in tdb_cons_append.

• Fix handling of disk full situations in tdb_cons_append.

• Fix semantics of how TDB_OPT_EVENT_FILTER filters are applied to cursors. Now the changes are applied at every call to tdb_get_trail, not at the creation of the cursor.

0.5 (2016-05-24)

Initial open-source release.