[Python][StreamQueryResult] Fix memory ownership issues in StreamQueryResult::FetchRaw

src/main/stream_query_result.cpp

@@ -55,7 +55,12 @@ unique_ptr<DataChunk> StreamQueryResult::FetchRaw() {
 	{
 		auto lock = LockContext();
 		CheckExecutableInternal(*lock);
-		chunk = context->Fetch(*lock, *this);
+		auto system_chunk = context->Fetch(*lock, *this);
+		if (system_chunk) {
+			chunk = make_uniq<DataChunk>();
+			chunk->Initialize(Allocator::DefaultAllocator(), system_chunk->GetTypes());
+			system_chunk->Copy(*chunk, 0);
+		}
 	}
 	if (!chunk || chunk->ColumnCount() == 0 || chunk->size() == 0) {
 		Close();

tools/pythonpkg/tests/fast/api/test_streaming_result.py

@@ -61,3 +61,23 @@ def test_record_batch_reader(self):
             result = []
             for batch in reader:
                 result += batch.to_pydict()['i']
+
+    def test_9801(self, duckdb_cursor):
+        duckdb_cursor.execute('CREATE TABLE test(id INTEGER , name VARCHAR NOT NULL);')
+
+        words = ['aaaaaaaaaaaaaaaaaaaaaaa', 'bbbb', 'ccccccccc', 'ííííííííí']
+        lines = [(i, words[i % 4]) for i in range(1000)]
+        duckdb_cursor.executemany("INSERT INTO TEST (id, name) VALUES (?, ?)", lines)
+
+        rel1 = duckdb_cursor.sql(
+            """
+            SELECT id, name FROM test ORDER BY id ASC
+        """
+        )
+        result = rel1.fetchmany(size=5)
+        counter = 0
+        while result != []:
+            for x in result:
+                assert x == (counter, words[counter % 4])
+                counter += 1
+            result = rel1.fetchmany(size=5)