[I] Implement partition path generation (PartitionPathUtils) [paimon-rust]

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

luoyuxia opened a new issue, #127:
URL: https://github.com/apache/paimon-rust/issues/127

   ## Parent Issue
   Part of #124 (support partitioned table)
   Depends on #126 (BinaryRow deserialization)
   
   ## Background
   
   Paimon stores data files under partition directories like `{table_path}/dt=2024-01-01/hr=12/bucket-0/`. Currently there is no code to convert partition values (from `BinaryRow`) into this filesystem path format.
   
   ## What needs to be done
   
   1. **Create a partition path utility** (e.g., `spec/partition_utils.rs` or similar)
      - Given partition keys (names from `TableSchema.partition_keys()`) + partition field types (from `TableSchema.fields()`) + partition values (decoded `BinaryRow`), generate the partition path string
      - Format: `{key1}={value1}/{key2}={value2}/...`
   
   2. **Handle value formatting per data type**
      - `Int/BigInt/SmallInt/TinyInt` → integer string
      - `VarChar/Char/String` → string value
      - `Date` → `yyyy-MM-dd` format (days since epoch)
      - `Timestamp` → appropriate timestamp string
      - `Boolean` → `true`/`false`
      - `Float/Double` → decimal string
      - `Decimal` → decimal string
   
   3. **Handle special cases**
      - Null partition values → use `__DEFAULT_PARTITION__`
      - Special characters in string values → URL encoding if needed (follow Java Paimon's behavior)
   
   4. **Unit tests**
      - Single partition key
      - Multiple partition keys
      - Different data types (string, int, date)
      - Null partition value → `__DEFAULT_PARTITION__`
   
   ## Reference
   - Java: [`PartitionPathUtils`](https://github.com/apache/paimon/blob/release-0.8.2/paimon-common/src/main/java/org/apache/paimon/utils/PartitionPathUtils.java)
   
   ## Affected files
   - New file: `crates/paimon/src/spec/partition_utils.rs` (or integrated into existing module)


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Re: [I] Implement partition path generation (PartitionPathUtils) [paimon-rust]

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

QuakeWang commented on issue #127:
URL: https://github.com/apache/paimon-rust/issues/127#issuecomment-4060264587

   @luoyuxia plz assign this to me : )


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