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Change log

0.12.0

Refactor the underlying implementation to prepare for further development

New features

  • Add Binary, LargeBinary, FixedSizeBinary(n), FixedSizeList(n) support for arrow2
  • Add support to serialize / deserialize bool from integer arrays
  • Add a helper to construct Bool8 arrays
  • Include the path of the field that caused an error in the error message
  • Include backtrace information only for the debug representations of errors

API changes

  • Use impl serde::Serialize instead of &(impl serde::Serialize + ?Sized)
  • Use &[FieldRef] instead of &[Field] in arrow APIs

Removed deprecated API

  • Remove serde_arrow::schema::Schema
  • Remove serde_arrow::ArrowBuilder and serde_arrow::Arrow2Builder
  • Remove from_arrow_fields / to_arrow_fields for SerdeArrowSchema, use the TryFrom conversions to convert between fields and SerdeArrowSchema
  • Remove SerdeArrowSchema::new(), Overwrites::new()

0.11.8

  • Add arrow=53 support

Thanks

The following people contributed to this release:

0.11.7

  • Fix tracing of JSON mixing nulls with non-null data

0.11.6

  • Add arrow=52 support
  • Add support for Binary, LargeBinary (only arrow)
  • Add support for FixedSizeBinary(n) (only arrow>=47)
  • Add support for FixedSizeList(n) (only arrow)
  • Add support to overwrite field definitions with TracingOptions::overwrite
  • Add support to serialize enums without data (e.g., enum E { A, B, C}) as strings by setting the corresponding field to a string value (Utf, LargeUtf, Dictionary(_, Utf8), Dictionary(_, LargeUtf8)
  • Allow to trace enums without data as dictionary encoded strings by setting enums_without_data_as_strings to true in TracingOptions

0.11.5

  • Add serde_arrow::Serializer
  • Add support for new type wrappers, tuples and tuple structs to serde_arrow::Deserializer
  • Add a generic serde_arrow::ArrayBuilder with support for both arrow and arrow2
  • Implement TryFrom<&[Field]> (arrow and arrow2) and TryFrom<&[FieldRef]> (arrow only) for SerdeArrowSchema
  • Implement TryFrom<&SerdeArrowSchema> for Vec<Field> and Vec<FieldRef> for arrow

0.11.4

  • Add serde_arrow::Deserializer

0.11.3

  • Support for serializing/deserializing timestamps with second, microsecond, and nanosecond encoding.
  • Fixed (de)serialization of fractional seconds.

Thanks

The following people contributed to this release:

  • @ryzhyk added string support for timestamps with non-millisecond units, fixed the handling of fractional seconds (PR)

0.11.2

  • Support Duration(unit)
  • Rewrite data type parsing with stricter parsing

0.11.1

  • Support Timestamp(Second, tz), Timestamp(Millisecond, tz), Timestamp(Nanosecond, tz). At the moment only (de)serialization from / to integers is supported for non-microsecond units
  • Support Time32(unit)

0.11.0

0.11.0 does not contain any known breaking changes. However it's a major refactoring and untested behavior may change.

The biggest feature is the removal of the bytecode deserializer and use of the Serde API directly. With this change, the code is easier to understand and extend. Further Deserialization implementations can request specific types and serde_arrow is able to supply them. As a consequence deserialization of chrono::DateTime<Utc> is supported by serde_arrow without an explicit strategy.

Further changes:

  • Add arrow=51 support
  • Add Date32 and Time64 support
  • Add to_record_batch, from_record_batch to offer more streamlined APIs for working with record batches
  • Allow to perform zero-copy deserialization from arrow arrays
  • Allow to use arrow schemas in SchemaLike::from_value(), e.g., let fields = Vec::<Field>::from_value(&batch.schema()).
  • Implement SchemaLike for arrow::datatypes::FieldRefs
  • Fix bug in SchemaLike::from_type() for nested unions

Thanks

The following people contributed to this release:

  • @gz added Date32 and Time64 support (PR)
  • @progval added additional error messages (PR)
  • @gstvg contributed zero-copy deserialization (PR)

0.10.0

  • Remove deprecated APIs
  • Use the serde serialization APIs directly, instead of using the bytecode serializer. Serialization will be about 2x faster
  • Fix bug in SchemaLike::from_value with incorrect strategy deserialization

Thanks

The following people contributed to this release:

  • @Ten0 motivated the rewrite to use the serde API directly and contributed additional benchmarks for JSON transcoding (PR)
  • @alamb added improved documentation on how to use serde_arrow with the arrow crate (PR)

0.9.1

  • Decimal128 support: serialize / deserialize rust_decimal and bigdecimal objects
  • Add arrow=50 support
  • Improved error messages when deserializing SchemaLike
  • Relax Sized requirement for SchemaLike::from_samples(..), SchemaLike::from_type(..), SchemaLike::from_value(..)
  • Derive Debug, PartialEq for Item and Items

0.9.0

Breaking changes:

  • Make tracing options non-exhaustive
  • Remove the try_parse_dates field in favor of the guess_dates field in TracingOptions (the setter name is not affected)
  • Remove the experimental configuration api

Improvements:

  • Simpler and streamlined API (to_arrow / from_arrow and to_arrow2 / from_arrow2)
  • Add SchemaLike trait to support direct construction of arrow / arrow2 fields
  • Add type based tracing to allow schema tracing without samples (SchemaLike::form_type())
  • Allow to build schema objects from serializable objects, e.g., serde_json::Value (SchemaLike::from_value())
  • Add support for arrow=47, arrow=48, arrow=49
  • Improve error messages in schema tracing
  • Fix bug in arrow2=0.16 support
  • Fix unused warnings without selected arrow versions

Deprecations (see the documentation of deprecated items for how to migrate):

  • Rename serde_arrow::schema::Schema to serde_arrow::schema::SerdeArrowSchema to prevent name clashes with the schema types of arrow and arrow2.
  • Deprecate serialize_into_arrays, deserialize_from_arrays methods in favor of to_arrow / to_arrow2 and from_arrow / from_arrow2
  • Deprecate serialize_into_fields methods in favor of SchemaLike::from_samples
  • Deprecated single item methods in favor of using the Items and Item wrappers

0.8.0

Make bytecode based serialization and deserialization the default

  • Remove state machine serialization, and use bytecode serialization as the default. This change results in a 2.6x speed up for the default configuration
  • Implement deserialization via bytecode (remove state machine implementation)
  • Add deserialization support for arrow

Update arrow version support

  • Add arrow=40, arrow=41, arrow=42, arrow=43,arrow=44, arrow=45, arrow=46 support
  • Remove for arrow=35, arrow=36 support

Improve type support

  • Implement bytecode serialization / deserialization of f16
  • Add support for coercing different numeric types (use TracingOptions::default().coerce_numbers(true))
  • Add support for Timestamp(Milliseconds, None) and Timestamp(Milliseconds, Some("UTC")).

Quality of life features

  • Ignore unknown fields in serialization (Rust -> Arrow)
  • Raise an error if resulting arrays are of unequal length (#78)
  • Add an experimental schema struct under serde_arrow::experimental::Schema that can be easily serialized and deserialized.

No longer export the base module: the implementation details as-is where not really useful. Remove for now and think about a better design.

Bug fixes:

  • Fix bug in bytecode serialization for missing fields (#79)
  • Fix bytecode serialization for nested options, .e.g, Option<Option<T>>.
  • Fix bytecode serialization of structs with missing fields, e.g., missing keys with maps serialized as structs
  • Fix nullable top-level fields in bytecode serialization
  • Fix bug in bytecode serialization for out of order fields (#80)

0.7.1

  • Fix a bug for unions with unknown variants reported here. Now serde_arrow correctly handles unions during serialization, for which not all variants were encountered during tracing. Serializing unknown variants will result in an error. All variants that are seen during tracing are save to use.

0.7

  • Breaking change: add new Item event emitted before list items, tuple items, or map entries

  • Add support for arrow=38 and arrow=39 with the arrow-38 and arrow-39 features

  • Add support for an experimental bytecode serializer that shows speeds of up to 4x. Enable it with

    serde_arrow::experimental::configure(|config| {
    config.serialize_with_bytecode = true;
});

    This setting is global and used for all calls to serialize_to_array and serialize_to_arrays. At the moment the following features are not supported by the bytecode serializer:

    • nested options (Option<Option<T>>)
    • creating float16 arrays

Thanks

The following people contributed to this release:

0.6.1

  • Add support for arrow=37 with the arrow-37 feature

0.6.0

Add support for arrow2

Now both arrow and arrow2 are supported. Use the features to select the relevant version of either crate. E.g., to use serde_arrow with arrow=0.36:

serde_arrow = { version = "0.6", features = ["arrow-36"] }

Deserialization support (arrow2 only)

serde_arrow now supports to deserialize Rust objects from arrays. At the moment this operation is only support for arrow2. Adding support arrow is planned.

More flexible support for Rust / Arrow features

serde_arrow now supports many more Rust and Arrow features.

  • Rust: Struct, Lists, Maps, Enums, Tuples
  • Arrow: Struct, List, Maps, Unions, ...

Removal of custom schema APIs

serde_arrow no longer relies on its own schema object. Now all schema information is retrieved from arrow fields with additional metadata.

More flexible APIs

In addition to the previous API that worked on a sequence of records, serde_arrow now also supports to operate on a sequence of individual items (serialize_into_array, deserialize_form_array) and to operate on single items (ArraysBuilder).

Support for dictionary encoded strings (categories)

serde_arrow supports dictionary encoding for string arrays. This way string arrays are encoded via a lookup table to avoid including repeated string values.

0.5.0

  • Bump arrow to version 16.0.0