fix: preserve adaptive IVF probe defaults (#4168)

Keep IVF probe fields unset by default so Lance supplies adaptive
behavior. Preserve `nprobes`, `minimum_nprobes`, and `maximum_nprobes`
independently through Rust, Python, namespace, and remote request
construction, with compatibility fields serialized only when explicitly
configured.

The final Rust namespace and LSM propagation update depends on the Lance
release containing lance-format/lance#9184.

python/python/tests/test_query.py

@@ -995,12 +995,22 @@ def test_invalid_nprobes_sync(table):
         ValueError,
         match="maximum_nprobes must be greater than or equal to minimum_nprobes",
     ):
-        LanceVectorQueryBuilder(table, [0, 0], "vector").maximum_nprobes(5).to_list()
+        (
+            LanceVectorQueryBuilder(table, [0, 0], "vector")
+            .minimum_nprobes(10)
+            .maximum_nprobes(5)
+            .to_list()
+        )
     with pytest.raises(
         ValueError,
-        match="minimum_nprobes must be less than or equal to maximum_nprobes",
+        match="maximum_nprobes must be greater than or equal to minimum_nprobes",
     ):
-        LanceVectorQueryBuilder(table, [0, 0], "vector").minimum_nprobes(100).to_list()
+        (
+            LanceVectorQueryBuilder(table, [0, 0], "vector")
+            .maximum_nprobes(5)
+            .minimum_nprobes(100)
+            .to_list()
+        )
 
 
 def test_nprobes_works_sync(table):
@@ -1039,12 +1049,22 @@ async def test_invalid_nprobes_async(table_async: AsyncTable):
         ValueError,
         match="maximum_nprobes must be greater than or equal to minimum_nprobes",
     ):
-        await table_async.vector_search([0, 0]).maximum_nprobes(5).to_list()
+        await (
+            table_async.vector_search([0, 0])
+            .minimum_nprobes(10)
+            .maximum_nprobes(5)
+            .to_list()
+        )
     with pytest.raises(
         ValueError,
         match="minimum_nprobes must be less than or equal to maximum_nprobes",
     ):
-        await table_async.vector_search([0, 0]).minimum_nprobes(100).to_list()
+        await (
+            table_async.vector_search([0, 0])
+            .maximum_nprobes(5)
+            .minimum_nprobes(100)
+            .to_list()
+        )
 
 
 def test_query_builder_with_prefilter(table):
@@ -1635,8 +1655,9 @@ def test_query_serialization_sync(table: lancedb.table.Table):
         q,
         vector_column="vector",
         vector=[5.0, 6.0],
-        minimum_nprobes=10,
-        maximum_nprobes=10,
+        nprobes=10,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         refine_factor=5,
     )
 
@@ -1654,8 +1675,19 @@ def test_query_serialization_sync(table: lancedb.table.Table):
         q,
         vector_column="vector",
         vector=[5.0, 6.0],
-        minimum_nprobes=50,
-        maximum_nprobes=50,
+        nprobes=50,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
+    )
+
+    q = table.search([5.0, 6.0]).minimum_nprobes(5).nprobes(50).to_query_object()
+    check_set_props(
+        q,
+        vector_column="vector",
+        vector=[5.0, 6.0],
+        nprobes=50,
+        minimum_nprobes=5,
+        maximum_nprobes=None,
     )
 
     q = table.search([5.0, 6.0]).maximum_nprobes(10).to_query_object()
@@ -1667,6 +1699,15 @@ def test_query_serialization_sync(table: lancedb.table.Table):
         minimum_nprobes=None,
     )
 
+    q = table.search([5.0, 6.0]).nprobes(5).maximum_nprobes(0).to_query_object()
+    check_set_props(
+        q,
+        vector_column="vector",
+        vector=[5.0, 6.0],
+        nprobes=5,
+        maximum_nprobes=0,
+    )
+
     q = table.search([5.0, 6.0]).distance_range(0.0, 1.0).to_query_object()
     check_set_props(
         q, vector_column="vector", vector=[5.0, 6.0], lower_bound=0.0, upper_bound=1.0
@@ -1716,8 +1757,8 @@ async def test_query_serialization_async(table_async: AsyncTable):
         limit=10,
         vector=sample_vector,
         postfilter=False,
-        minimum_nprobes=20,
-        maximum_nprobes=20,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         bypass_vector_index=False,
     )
@@ -1727,8 +1768,8 @@ async def test_query_serialization_async(table_async: AsyncTable):
         q,
         vector=sample_vector,
         postfilter=False,
-        minimum_nprobes=20,
-        maximum_nprobes=20,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         bypass_vector_index=False,
         limit=10,
@@ -1739,8 +1780,9 @@ async def test_query_serialization_async(table_async: AsyncTable):
         q,
         vector=sample_vector,
         postfilter=False,
-        minimum_nprobes=50,
-        maximum_nprobes=50,
+        nprobes=50,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         bypass_vector_index=False,
         limit=10,
@@ -1759,8 +1801,8 @@ async def test_query_serialization_async(table_async: AsyncTable):
         filter="id = 1",
         postfilter=True,
         vector=sample_vector,
-        minimum_nprobes=20,
-        maximum_nprobes=20,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         bypass_vector_index=False,
     )
@@ -1774,8 +1816,9 @@ async def test_query_serialization_async(table_async: AsyncTable):
     check_set_props(
         q,
         vector=sample_vector,
-        minimum_nprobes=10,
-        maximum_nprobes=10,
+        nprobes=10,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         refine_factor=5,
         postfilter=False,
         with_row_id=False,
@@ -1788,7 +1831,24 @@ async def test_query_serialization_async(table_async: AsyncTable):
         q,
         vector=sample_vector,
         minimum_nprobes=5,
-        maximum_nprobes=20,
+        maximum_nprobes=None,
+        postfilter=False,
+        with_row_id=False,
+        bypass_vector_index=False,
+        limit=10,
+    )
+
+    q = (
+        (await table_async.search([5.0, 6.0]))
+        .nprobes(5)
+        .maximum_nprobes(0)
+        .to_query_object()
+    )
+    check_set_props(
+        q,
+        vector=sample_vector,
+        nprobes=5,
+        maximum_nprobes=0,
         postfilter=False,
         with_row_id=False,
         bypass_vector_index=False,
@@ -1806,8 +1866,8 @@ async def test_query_serialization_async(table_async: AsyncTable):
         lower_bound=0.0,
         upper_bound=1.0,
         postfilter=False,
-        minimum_nprobes=20,
-        maximum_nprobes=20,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         bypass_vector_index=False,
         limit=10,
@@ -1819,8 +1879,8 @@ async def test_query_serialization_async(table_async: AsyncTable):
         distance_type="cosine",
         vector=sample_vector,
         postfilter=False,
-        minimum_nprobes=20,
-        maximum_nprobes=20,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         bypass_vector_index=False,
         limit=10,
@@ -1832,8 +1892,8 @@ async def test_query_serialization_async(table_async: AsyncTable):
         ef=7,
         vector=sample_vector,
         postfilter=False,
-        minimum_nprobes=20,
-        maximum_nprobes=20,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         bypass_vector_index=False,
         limit=10,
@@ -1845,8 +1905,8 @@ async def test_query_serialization_async(table_async: AsyncTable):
         bypass_vector_index=True,
         vector=sample_vector,
         postfilter=False,
-        minimum_nprobes=20,
-        maximum_nprobes=20,
+        minimum_nprobes=None,
+        maximum_nprobes=None,
         with_row_id=False,
         limit=10,
     )