Support Pandas' new str type

Author: evertlammerts

src/duckdb_py/numpy/type.cpp

@@ -58,6 +58,9 @@ static NumpyNullableType ConvertNumpyTypeInternal(const string &col_type_str) {
 	if (col_type_str == "string") {
 		return NumpyNullableType::STRING;
 	}
+	if (col_type_str == "str") {
+		return NumpyNullableType::STRING;
+	}
 	if (col_type_str == "object") {
 		return NumpyNullableType::OBJECT;
 	}

tests/fast/pandas/test_new_string_type.py

@@ -0,0 +1,20 @@
+import pandas as pd
+import pytest
+from packaging.version import Version
+
+import duckdb
+
+
+@pytest.mark.skipif(
+    Version(pd.__version__) < Version("3.0"), reason="Pandas < 3.0 doesn't have the new string type yet"
+)
+def test_new_str_type_pandas_3_0():
+    df = pd.DataFrame({"s": ["DuckDB"]})  # noqa: F841
+    duckdb.sql("select * from df")
+
+
+@pytest.mark.skipif(Version(pd.__version__) >= Version("3.0"), reason="Pandas >= 3.0 has the new string type")
+def test_new_str_type_pandas_lt_3_0():
+    pd.options.future.infer_string = True
+    df = pd.DataFrame({"s": ["DuckDB"]})  # noqa: F841
+    duckdb.sql("select * from df")