Crate rerun::dataframe::external::re_chunk_store

The Rerun chunk store, implemented on top of Apache Arrow using the arrow2 crate.

This crate is an in-memory time series database for Rerun log data. It is indexed by Entity path, component, timeline, and time. It supports out-of-order insertions, and fast O(log(N)) queries.

• See ChunkStore for an overview of the core data structures.
• See ChunkStore::latest_at_relevant_chunks and ChunkStore::range_relevant_chunks for the documentation of the public read APIs.
• See ChunkStore::insert_chunk for the documentation of the public write APIs.

Feature flags

• deadlock_detection — Enables parking_lot’s deadlock detection background thread.

Modules

• external

Structs

• Chunk
  Dense arrow-based storage of N rows of multi-component multi-temporal data for a specific entity.
• ChunkId
  A unique ID for a crate::Chunk.
• ChunkStore
  A complete chunk store: covers all timelines, all entities, everything.
• ChunkStoreChunkStats
  Stats about a collection of chunks.
• ChunkStoreConfig
• ChunkStoreDiff
  Describes an atomic change in the Rerun ChunkStore: a chunk has been added or deleted.
• ChunkStoreEvent
  The atomic unit of change in the Rerun ChunkStore.
• ChunkStoreGeneration
  Incremented on each edit.
• ChunkStoreHandle
  A ref-counted, inner-mutable handle to a ChunkStore.
• ChunkStoreStats
• ChunkStoreSubscriberHandle
• ColumnMetadata
• ComponentColumnDescriptor
  Describes a data/component column, such as Position3D.
• ComponentColumnSelector
  Select a component based on its EntityPath and ComponentName.
• GarbageCollectionOptions
• LatestAtQuery
  A query at a given time, for a given timeline.
• QueryExpression
  Describes a complete query for Rerun’s dataframe API.
• RangeQuery
  A query over a time range, for a given timeline.
• RangeQueryOptions
• ResolvedTimeRange
• RowId
  A unique ID for a row’s worth of data within a chunk.
• TimeColumnDescriptor
  Describes a time column, such as log_time.
• TimeColumnSelector
  Select a time column.
• TimeInt
  A 64-bit number describing either nanoseconds, sequence numbers or fully static data.
• Timeline
  A time frame/space, e.g. log_time or frame_nr, coupled with the type of time it keeps.
• UnitChunkShared
  A ChunkShared that is guaranteed to always contain a single row’s worth of data.

Enums

• ChunkStoreDiffKind
  Is it an addition or a deletion?
• ChunkStoreError
• ColumnDescriptor
• ColumnSelector
  Describes a column selection to return as part of a query.
• GarbageCollectionTarget
• SparseFillStrategy
  Specifies how null values should be filled in the returned dataframe.
• TimeType
  The type of a TimeInt or Timeline.
• VersionPolicy
  How to handle version mismatches during decoding.

Traits

• ChunkStoreSubscriber
  A ChunkStoreSubscriber subscribes to atomic changes from all ChunkStores through ChunkStoreEvents.

Type Aliases

• ChunkShared
  A simple type alias for an Arc<Chunk>.
• ChunkStoreResult
• Index
• IndexRange
• IndexValue
• ViewContentsSelector
  The view contents specify which subset of the database (i.e., which columns) the query runs on, expressed as a set of EntityPaths and their associated ComponentNames.