emkornfield commented on code in PR #34054:
URL: https://github.com/apache/arrow/pull/34054#discussion_r1132717312
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cpp/src/parquet/arrow/arrow_reader_writer_test.cc:
##########
@@ -5146,5 +5158,96 @@ TEST(TestArrowReadWrite, FuzzReader) {
}
}
+TEST(TestArrowReadWrite, WriteReadPageIndexRoundTrip) {
+ // Enable page index to the writer.
+ auto writer_properties = WriterProperties::Builder()
+ .enable_write_page_index()
+ ->max_row_group_length(4)
+ ->build();
+ auto arrow_writer_properties = default_arrow_writer_properties();
+ auto pool = ::arrow::default_memory_pool();
+ auto sink = CreateOutputStream();
+ auto schema = ::arrow::schema(
+ {::arrow::field("c0", ::arrow::int64()), ::arrow::field("c1",
::arrow::utf8())});
+ std::shared_ptr<SchemaDescriptor> parquet_schema;
+ ASSERT_OK_NO_THROW(ToParquetSchema(schema.get(), *writer_properties,
+ *arrow_writer_properties,
&parquet_schema));
+ auto schema_node =
std::static_pointer_cast<GroupNode>(parquet_schema->schema_root());
+
+ // Prepare data and each row group contains 4 rows.
+ auto record_batch = ::arrow::RecordBatchFromJSON(schema, R"([
+ [1, "a"],
+ [2, "b"],
+ [3, "c"],
+ [null, "d"],
+ [5, null],
+ [6, "f"]
+ ])");
+
+ // Create writer to write data via RecordBatch.
+ auto writer = ParquetFileWriter::Open(sink, schema_node, writer_properties);
+ std::unique_ptr<FileWriter> arrow_writer;
+ ASSERT_OK(FileWriter::Make(pool, std::move(writer), record_batch->schema(),
+ arrow_writer_properties, &arrow_writer));
+ ASSERT_OK_NO_THROW(arrow_writer->WriteRecordBatch(*record_batch));
+ ASSERT_OK_NO_THROW(arrow_writer->Close());
+ ASSERT_OK_AND_ASSIGN(auto buffer, sink->Finish());
+
+ // Create reader to read page index.
+ auto read_properties = default_arrow_reader_properties();
+ auto reader =
ParquetFileReader::Open(std::make_shared<BufferReader>(buffer));
+ auto metadata = reader->metadata();
+ ASSERT_EQ(2, metadata->num_row_groups());
+
+ // Make sure page index reader is not null.
+ auto page_index_reader = reader->GetPageIndexReader();
+ ASSERT_NE(page_index_reader, nullptr);
+
+ auto encode_int64 = [=](int64_t value) {
+ return std::string(reinterpret_cast<const char*>(&value), sizeof(int64_t));
+ };
+
+ const std::vector<std::string> c0_min_values = {encode_int64(1),
encode_int64(5)};
+ const std::vector<std::string> c0_max_values = {encode_int64(3),
encode_int64(6)};
+ const std::vector<std::string> c1_min_values = {"a", "f"};
+ const std::vector<std::string> c1_max_values = {"d", "f"};
+ const std::vector<int64_t> c0_null_counts = {1, 0};
+ const std::vector<int64_t> c1_null_counts = {0, 1};
+
+ const size_t num_pages = 1;
+ for (int rg = 0; rg < metadata->num_row_groups(); ++rg) {
+ auto row_group_index_reader = page_index_reader->RowGroup(rg);
+ ASSERT_NE(row_group_index_reader, nullptr);
+
+ // Verify offset index.
+ for (int c = 0; c < metadata->num_columns(); ++c) {
+ auto offset_index = row_group_index_reader->GetOffsetIndex(c);
+ ASSERT_NE(offset_index, nullptr);
+ ASSERT_EQ(num_pages, offset_index->page_locations().size());
+ ASSERT_EQ(0, offset_index->page_locations()[0].first_row_index);
+ }
+
+ // Verify column index of c0.
+ auto c0_column_index = row_group_index_reader->GetColumnIndex(0);
+ ASSERT_NE(c0_column_index, nullptr);
+ ASSERT_EQ(num_pages, c0_column_index->null_pages().size());
Review Comment:
could you remind me why this is null_pages?
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