pitrou commented on code in PR #50160:
URL: https://github.com/apache/arrow/pull/50160#discussion_r3419048170
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cpp/src/parquet/arrow/arrow_reader_writer_test.cc:
##########
@@ -3324,6 +3325,75 @@ TEST(ArrowReadWrite, LargeList) {
}
}
+TEST(ArrowReadWrite, ListView) {
+ auto values = ArrayFromJSON(::arrow::int32(), "[1, 2, 3, 4, 5]");
+ auto offsets = ArrayFromJSON(::arrow::int32(), "[3, 0, 5, 1]");
+ auto sizes = ArrayFromJSON(::arrow::int32(), "[2, 1, 0, 2]");
+ ASSERT_OK_AND_ASSIGN(auto array, ::arrow::ListViewArray::FromArrays(
+ ::arrow::list_view(::arrow::int32()),
*offsets,
+ *sizes, *values,
default_memory_pool()));
+ auto table = Table::Make(
+ ::arrow::schema({::arrow::field("root", array->type(), false)}),
{array});
+
+ auto props_store_schema =
ArrowWriterProperties::Builder().store_schema()->build();
+ CheckSimpleRoundtrip(table, 2, props_store_schema);
+
+ ASSERT_OK_AND_ASSIGN(auto expected_array,
+ ::arrow::ListArray::FromListView(*array,
default_memory_pool()));
+ auto expected = Table::Make(
+ ::arrow::schema({::arrow::field("root", ::arrow::list(::arrow::int32()),
false)}),
+ {expected_array});
+ CheckConfiguredRoundtrip(table, expected);
+}
+
+TEST(ArrowReadWrite, EmptyListView) {
+ auto type = ::arrow::list_view(::arrow::int32());
+ auto array = ArrayFromJSON(type, "[]");
+ auto table = Table::Make(::arrow::schema({::arrow::field("root", type)}),
{array});
+
+ auto props_store_schema =
ArrowWriterProperties::Builder().store_schema()->build();
+ std::shared_ptr<Table> result;
+ ASSERT_NO_FATAL_FAILURE(
+ DoRoundtrip(table, 1, &result, default_writer_properties(),
props_store_schema));
+ ASSERT_OK(result->ValidateFull());
+
+ ASSERT_EQ(1, result->column(0)->num_chunks());
+ const auto& list_view =
+ checked_cast<const
::arrow::ListViewArray&>(*result->column(0)->chunk(0));
+ ASSERT_EQ(0, list_view.length());
+ ASSERT_NE(nullptr, list_view.value_offsets());
+ ASSERT_EQ(0, list_view.value_offsets()->size());
+ ASSERT_NE(nullptr, list_view.value_sizes());
+ ASSERT_EQ(0, list_view.value_sizes()->size());
+}
+
+TEST(ArrowReadWrite, LargeListView) {
+ auto values = ArrayFromJSON(::arrow::int32(), "[1, 2, 3, 4, 5]");
Review Comment:
I'm not sure why the child array would have a different name vs. the regular
ListView case, but in any case you can have a helper function that also takes
the inner element's name as argument.
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