Crate mcap2arrow_core 

Encoding-agnostic core types and decoder contracts for mcap2arrow.

This crate provides Arrow-independent intermediate representations (Value / DataTypeDef) and the MessageDecoder trait.

Structs

DecodedMessage

A decoded message payload used for Arrow conversion.

ElementDef

Arrow-independent nested element definition used in composite types.

EncodingKey

Key identifying a (schema_encoding, message_encoding) pair.

FieldDef

Arrow-independent field definition for schema intermediate representation.

FieldDefs

Typed collection of FieldDef used for schema bodies and struct members.

ValueTypeError

Enums

DataTypeDef

Arrow-independent data type definition for schema intermediate representation.

DecoderError

Error returned by MessageDecoder implementations.

MessageEncoding

Message encodings defined in the mcap spec registry. https://mcap.dev/spec/registry

SchemaEncoding

Schema encodings defined in the mcap spec registry. https://mcap.dev/spec/registry

Value

Value produced by message decoders. All types are explicit; no lossy conversions.

Traits

MessageDecoder

Factory trait that builds topic-local decoders from MCAP schema metadata.

TopicDecoder

Topic-local decoder built from MCAP schema metadata.

Functions

format_field_defs

Format field definitions in a readable style: primitive fields are rendered in one line, compound fields are pretty-printed. Nested fields follow the same rule.