## What's Changed * Fix inverted revision sort order in memory database by @hackerwins in https://github.com/yorkie-team/yorkie/pull/1676 * Add attributes_to_remove support to Operation.Style for text undo/redo by @hackerwins in https://github.com/yorkie-team/yorkie/pull/1678 * Optimize FindCompactionCandidates query with compound index by @raararaara in https://github.com/yorkie-team/yorkie/pull/1677 * Fix empty documentSize in GetDocument response by @hackerwins in https://github.com/yorkie-team/yorkie/pull/1687 **Full Changelog**: https://github.com/yorkie-team/yorkie/compare/v0.6.48...v0.6.49