feat: add multi-path support for lance data paths

.github/workflows/rust.yml

@@ -156,7 +156,7 @@ jobs:
           ALL_FEATURES=`cargo metadata --format-version=1 --no-deps | jq -r '.packages[] | .features | keys | .[]' | grep -v protoc | sort | uniq | paste -s -d "," -`
           cargo test --locked --features ${ALL_FEATURES}
   build-no-lock:
-    runs-on: ubuntu-24.04
+    runs-on: warp-ubuntu-2404-x64-8x
     timeout-minutes: 30
     env:
       # Need up-to-date compilers for kernels

java/lance-jni/src/blocking_dataset.rs

@@ -564,6 +564,7 @@ pub fn inner_commit_overwrite<'local>(
         fragments,
         schema,
         config_upsert_values: None,
+        initial_bases: None,
     };
     let path_str = path.extract(env)?;
     let read_version = env.get_u64_opt(&read_version_obj)?;

java/lance-jni/src/transaction.rs

@@ -472,6 +472,7 @@ fn convert_to_java_operation_inner<'local>(
             fragments: rust_fragments,
             schema,
             config_upsert_values,
+            initial_bases: _,
         } => {
             let java_fragments = export_vec(env, &rust_fragments)?;
             let java_schema = convert_to_java_schema(env, schema)?;
@@ -890,6 +891,7 @@ fn convert_to_rust_operation(
                 fragments,
                 schema,
                 config_upsert_values,
+                initial_bases: None,
             }
         }
         "Rewrite" => {

protos/transaction.proto

@@ -68,6 +68,8 @@ message Transaction {
     map<string, bytes> schema_metadata = 3;
     // Key-value pairs to merge with existing config.
     map<string, string> config_upsert_values = 4;
+    // The base paths to be added for the initial dataset creation
+    repeated BasePath initial_bases = 5;
   }
 
   // Add or replace a new secondary index.

python/python/lance/__init__.py

@@ -26,6 +26,7 @@
 )
 from .fragment import FragmentMetadata, LanceFragment
 from .lance import (
+    DatasetBasePath,
     FFILanceTableProvider,
     ScanStatistics,
     bytes_read_counter,
@@ -47,6 +48,7 @@
 __all__ = [
     "BlobColumn",
     "BlobFile",
+    "DatasetBasePath",
     "DataStatistics",
     "FieldStatistics",
     "FragmentMetadata",

python/python/lance/dataset.py

@@ -52,6 +52,7 @@
     CleanupStats,
     Compaction,
     CompactionMetrics,
+    DatasetBasePath,
     LanceSchema,
     ScanStatistics,
     _Dataset,
@@ -4897,6 +4898,8 @@ def write_dataset(
     auto_cleanup_options: Optional[AutoCleanupConfig] = None,
     commit_message: Optional[str] = None,
     transaction_properties: Optional[Dict[str, str]] = None,
+    initial_bases: Optional[List[DatasetBasePath]] = None,
+    target_bases: Optional[List[str]] = None,
 ) -> LanceDataset:
     """Write a given data_obj to the given uri
 
@@ -4975,6 +4978,19 @@ def write_dataset(
         and can be retrieved using read_transaction().
         If both `commit_message` and `properties` are provided, `commit_message` will
         override any "lance.commit.message" key in `properties`.
+    initial_bases: list of DatasetBasePath, optional
+        New base paths to register in the manifest. Only used in **CREATE mode**.
+        Cannot be specified in APPEND or OVERWRITE modes.
+    target_bases: list of str, optional
+        References to base paths where data should be written. Can be
+        specified in all modes.
+
+        Each string is resolved by trying to match:
+        1. Base name (e.g., "primary", "archive") from registered bases
+        2. Base path URI (e.g., "s3://bucket1/data")
+
+        **CREATE mode**: References must match bases in `initial_bases`
+        **APPEND/OVERWRITE modes**: References must match bases in the existing manifest
     """
     if use_legacy_format is not None:
         warnings.warn(
@@ -5016,6 +5032,8 @@ def write_dataset(
         "enable_stable_row_ids": enable_stable_row_ids,
         "auto_cleanup_options": auto_cleanup_options,
         "transaction_properties": merged_properties,
+        "initial_bases": initial_bases,
+        "target_bases": target_bases,
     }
 
     if commit_lock: