feat: storage support for vector search

[chienguo]

Summary by CodeRabbit

• New Features

  • Enhanced server output with build version and date for better tracking.
  • Introduced new methods for managing HNSW index and node metadata, as well as edges and neighbors.
  • Added a new column family for search data in the Redis storage implementation.
  • Defined data structures for HNSW graph metadata and node information.

• Bug Fixes

  • Improved data handling and integrity for HNSW functionalities.

• Tests

  • Implemented unit tests for HNSW indexing and search functionality to ensure proper operation and data integrity.

[coderabbitai]

Walkthrough

The pull request introduces enhancements to the PikiwiDB system, focusing on the management of HNSW (Hierarchical Navigable Small World) indexing and metadata. Key changes include the addition of new methods for handling HNSW index and node metadata, as well as the integration of a new column family for search data. The server's output is also improved with build information, and various utility functions for encoding and decoding data types are introduced. Overall, these modifications expand the functionality and efficiency of the storage system.

Changes

Files	Change Summary
src/cmd_admin.cc	Added logging for Git commit ID and build date in InfoCmd::InfoServer function.
src/storage/include/storage/storage.h	Added methods for managing HNSW index and node metadata, edges, and neighbors in the Storage class.
src/storage/include/storage/storage_define.h	Added kSearchDataCF to ColumnFamilyIndex enumeration and updated kColumnFamilyNum.
src/storage/src/base_value_format.h	Expanded DataType enum to include kSearch, updated associated string representations.
src/storage/src/coding.h	Introduced new inline functions for encoding and decoding fixed-size integers, doubles, and sized strings.
src/storage/src/redis.cc	Implemented a new column family for search data, including options and integration into existing database operations.
src/storage/src/redis.h	Added methods for managing HNSW index and node metadata, edges, and neighbors in the Redis class.
src/storage/src/redis_search.cc	Implemented HNSW index and node management functionalities within Redis storage context.
src/storage/src/search_format.h	Defined data structures and enumerations for managing HNSW graph metadata and node information.
src/storage/src/storage.cc	Added methods for managing HNSW index metadata and node metadata within the Storage class.
src/storage/tests/hnsw_search_test.cc	Created unit tests for HNSW indexing and search functionality, validating metadata management and neighbor relationships.

Poem

In the burrow deep, where data hops,
New features bloom, and the old one stops.
HNSW paths twist, like a rabbit's dash,
With metadata stored in a quick, clever flash.
Build dates and commits, oh what a sight!
PikiwiDB's journey takes flight tonight! 🐇✨

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Recent review details

Commits

Files that changed from the base of the PR and between 2ebe60d and 1f9de16.

Files selected for processing (2)

• src/storage/include/storage/storage.h (2 hunks)
• src/storage/src/storage.cc (2 hunks)

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