Fix Python

python/src/context.rs

@@ -34,6 +34,7 @@ use datafusion::prelude::{CsvReadOptions, ParquetReadOptions};
 use crate::catalog::{PyCatalog, PyTable};
 use crate::dataframe::PyDataFrame;
 use crate::dataset::Dataset;
+use crate::datatype::PyDataType;
 use crate::errors::DataFusionError;
 use crate::udf::PyScalarUDF;
 use crate::utils::wait_for_future;

python/src/datatype.rs

@@ -0,0 +1,39 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+/// Copied from https://github.com/apache/arrow-datafusion-python/pull/103
+
+use datafusion::arrow::datatypes::DataType;
+use pyo3::pyclass;
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
+#[pyclass(name = "PyDataType", module = "datafusion", subclass)]
+pub struct PyDataType {
+    pub(crate) data_type: DataType,
+}
+
+impl From<PyDataType> for DataType {
+    fn from(data_type: PyDataType) -> DataType {
+        data_type.data_type
+    }
+}
+
+impl From<DataType> for PyDataType {
+    fn from(data_type: DataType) -> PyDataType {
+        PyDataType { data_type }
+    }
+}