ARROW-16025: [Python][C++] Fix segmentation fault when closing ORCFileWritter

cpp/src/arrow/adapters/orc/adapter.cc

@@ -837,7 +837,9 @@ class ORCFileWriter::Impl {
   }
 
   Status Close() {
-    writer_->close();
+    if (writer_) {
+      writer_->close();
+    }
     return Status::OK();
   }
 

cpp/src/arrow/adapters/orc/adapter_test.cc

@@ -406,6 +406,23 @@ TEST(TestAdapterRead, ReadIntAndStringFileMultipleStripes) {
 
 // Trivial
 
+class TestORCWriterTrivialNoWrite : public ::testing::Test {};
+TEST_F(TestORCWriterTrivialNoWrite, noWrite) {
+  EXPECT_OK_AND_ASSIGN(auto buffer_output_stream,
+                       io::BufferOutputStream::Create(kDefaultSmallMemStreamSize / 16));
+  auto write_options = adapters::orc::WriteOptions();
+#ifdef ARROW_WITH_SNAPPY
+  write_options.compression = Compression::SNAPPY;
+#else
+  write_options.compression = Compression::UNCOMPRESSED;
+#endif
+  write_options.file_version = adapters::orc::FileVersion(0, 11);
+  write_options.compression_block_size = 32768;
+  write_options.row_index_stride = 5000;
+  EXPECT_OK_AND_ASSIGN(auto writer, adapters::orc::ORCFileWriter::Open(
+                                        buffer_output_stream.get(), write_options));
+  ARROW_EXPECT_OK(writer->Close());
+}
 class TestORCWriterTrivialNoConversion : public ::testing::Test {
  public:
   TestORCWriterTrivialNoConversion() {

python/pyarrow/tests/test_orc.py

@@ -613,3 +613,24 @@ def test_column_selection(tempdir):
 
     with pytest.raises(ValueError):
         orc_file.read(columns=[5])
+
+
+def test_wrong_usage_orc_writer(tempdir):
+    from pyarrow import orc
+
+    path = str(tempdir / 'test.orc')
+    with orc.ORCWriter(path) as writer:
+        with pytest.raises(AttributeError):
+            writer.test()
+
+
+def test_orc_writer_with_null_arrays(tempdir):
+    from pyarrow import orc
+    import pyarrow as pa
+
+    path = str(tempdir / 'test.orc')
+    a = pa.array([1, None, 3, None])
+    b = pa.array([None, None, None, None])
+    table = pa.table({"int64": a, "utf8": b})
+    with pytest.raises(pa.ArrowNotImplementedError):
+        orc.write_table(table, path)