feat: support 8bit ints (#284)

newsfragments/280.feat

@@ -0,0 +1,3 @@
+Adds support for writing DataFrames/Tables that have 8 bit integers. Hyper does
+not have an 8 bit integer data type, so it will be converted to a 16 bit integer
+upon writing.

src/pantab/writer.cpp

@@ -18,6 +18,7 @@ static auto GetHyperTypeFromArrowSchema(struct ArrowSchema *schema,
   }
 
   switch (schema_view.type) {
+  case NANOARROW_TYPE_INT8:
   case NANOARROW_TYPE_INT16:
     return hyperapi::SqlType::smallInt();
   case NANOARROW_TYPE_INT32:
@@ -356,6 +357,7 @@ static auto MakeInsertHelper(std::shared_ptr<hyperapi::Inserter> inserter,
   }
 
   switch (schema_view.type) {
+  case NANOARROW_TYPE_INT8:
   case NANOARROW_TYPE_INT16:
     return std::make_unique<IntegralInsertHelper<int16_t>>(
         inserter, chunk, schema, error, column_position);

tests/test_writer.py

@@ -348,3 +348,22 @@ def test_write_date_bug(tmp_hyper):
         [tab_api.Date(2024, 1, 1)],
         [tab_api.Date(2024, 1, 31)],
     ]
+
+
+def test_eight_bit_int(tmp_hyper):
+    frame = pd.DataFrame(list(range(10)), columns=["nums"]).astype("int8")
+
+    pt.frame_to_hyper(frame, tmp_hyper, table="test")
+
+    with tab_api.HyperProcess(
+        tab_api.Telemetry.DO_NOT_SEND_USAGE_DATA_TO_TABLEAU
+    ) as hyper:
+        with tab_api.Connection(
+            hyper.endpoint, tmp_hyper, tab_api.CreateMode.CREATE_IF_NOT_EXISTS
+        ) as connection:
+            table_def = connection.catalog.get_table_definition(
+                tab_api.TableName("test")
+            )
+            num_col = table_def.get_column_by_name("nums")
+            assert num_col is not None
+            assert num_col.type == tab_api.SqlType.small_int()