[PR] feat: add BTree global index core components [paimon-cpp]

["lszskye (via GitHub)" <gi...@apache.org>]

lszskye opened a new pull request, #74:
URL: https://github.com/apache/paimon-cpp/pull/74

   ## feat: add BTree global index core components
   
   ### Changes
   
   #### `BtreeDefs`
   - Constants struct defining BTree index configuration keys and default values: compression algorithm, compression level, block size, cache size, high-priority pool ratio, and read buffer size. Also defines the `"btree"` identifier.
   
   #### `BTreeFileFooter`
   - Footer structure for BTree index files containing bloom filter handle, index block handle, and null bitmap handle. Supports versioned serialization/deserialization via `Read()`/`Write()` with a magic number (`0x50425449`) for validation. Fixed encoding length of 52 bytes.
   
   #### `BTreeFileMetaSelector`
   - Implements `FunctionVisitor<std::vector<GlobalIndexIOMeta>>` to select candidate BTree index files based on filter predicates. 
   
   #### `BTreeIndexMeta`
   - Per-file metadata holding serialized first key, last key, and a `has_nulls` flag. Keys can be null when the entire file contains only null values (`OnlyNulls()`). Provides `Serialize()`/`Deserialize()` for binary persistence with a 9-byte fixed header (two 4-byte key lengths + 1-byte null flag).
   
   #### `KeySerializer`
   - Static utility for serializing `Literal` values to `Bytes` and deserializing `MemorySlice` back to `Literal`, supporting all Paimon data types. Provides `CreateComparator()` to build a `MemorySlice::SliceComparator` for binary key comparison based on Arrow data type.
   
   ### Tests
   
   - `BTreeFileFooterTest`
   - `BTreeFileMetaSelectorTest`
   - `BTreeIndexMetaTest`
   - `KeySerializerTest`


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Re: [PR] feat: add BTree global index core components [paimon-cpp]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #74:
URL: https://github.com/apache/paimon-cpp/pull/74


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