Crate copybook_arrow 

Typed Arrow and Parquet output for copybook-rs

Converts COBOL binary data directly to Apache Arrow columnar format, preserving COBOL type precision (Decimal128 for COMP-3/Zoned, proper int widths, etc.)

Re-exports

pub use batch_builder::RecordBatchBuilder;

pub use ipc::write_ipc;

pub use options::ArrowOptions;

pub use options::Compression;

pub use options::EditedPicRepresentation;

pub use parquet_writer::write_parquet;

pub use schema_convert::cobol_schema_to_arrow;

pub use streaming::stream_to_batches;

pub use legacy::LegacyArrowWriter as ArrowWriter;Deprecated

pub use legacy::LegacyParquetFileWriter as ParquetFileWriter;Deprecated

pub use legacy::json_to_record_batch;Deprecated

pub use legacy::json_to_schema;Deprecated

Modules

batch_builder

Columnar RecordBatch construction from decoded COBOL records. RecordBatch builder that accumulates records and flushes Arrow batches

builders

Per-column accumulator trait and typed column builders. Column accumulator implementations for building Arrow arrays from raw COBOL data.

decode_direct

Direct binary → Arrow decoding (bypasses JSON intermediate). Direct record-to-column decoding without JSON intermediate representation

ipc

Arrow IPC (Feather) file writer. Arrow IPC (Feather v2) file writer

legacy

Legacy JSONL-to-Arrow API (deprecated; prefer decode_direct). Legacy JSON-based Arrow/Parquet conversion (deprecated)

options

Arrow/Parquet output configuration (compression, edited-PIC handling). Configuration options for Arrow/Parquet output

parquet_writer

Apache Parquet file writer with configurable compression. Parquet file writer with configurable compression and metadata embedding

schema_convert

COBOL schema → Arrow schema conversion (type mapping). COBOL schema to Arrow schema conversion

streaming

Streaming record-by-record Arrow output for large files. Streaming record reader that produces Arrow RecordBatch objects

Enums

ArrowError

Errors that can occur during Arrow/Parquet conversion

Type Aliases

Result

Result type for Arrow operations