Changelog

Source: NEWS.md

deltaR (development version)

New Features

• MERGE operations: New delta_merge() function enables sophisticated data manipulation:
  • when_matched_update() and when_matched_update_all() for updating matched rows
  • when_matched_delete() for deleting matched rows
  • when_not_matched_insert() and when_not_matched_insert_all() for inserting new rows
  • when_not_matched_by_source_update() and when_not_matched_by_source_delete() for handling rows only in target
  • Full support for conditional predicates on all clauses
  • Returns detailed metrics (rows inserted, updated, deleted, etc.)

deltaR 0.1.0

New Features

• Initial release of deltaR, an R interface to Delta Lake.
• Reading Delta tables: Open and query Delta tables with delta_table().
• Writing Delta tables: Create and modify Delta tables with write_deltalake().
• Time travel: Access historical versions with load_version() and load_datetime().
• Schema evolution: Support for schema_mode = "merge" and schema_mode = "overwrite".
• Partitioned tables: Create partitioned tables with the partition_by parameter.
• Cloud storage support: Native support for Amazon S3, Google Cloud Storage, and Azure Blob Storage.
• Table maintenance: vacuum() method to remove old files.
• Table creation: create_deltalake() to create empty tables with a predefined schema.

Acknowledgments

This package is built on the excellent delta-rs Rust library. We are grateful to the delta-rs maintainers and the broader Delta Lake community for their work.