R-JunmingChen commented on code in PR #37418:
URL: https://github.com/apache/arrow/pull/37418#discussion_r1355131941
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cpp/src/arrow/array/array_dict_test.cc:
##########
@@ -1428,6 +1428,71 @@ TEST(TestDictionary, IndicesArray) {
ASSERT_OK(arr->indices()->ValidateFull());
}
+void CheckDictionaryCompact(const std::shared_ptr<DataType>& dict_type,
+ const std::string& input_dictionary_json,
+ const std::string& input_index_json,
+ const std::string& expected_dictionary_json,
+ const std::string& expected_index_json) {
+ auto input = DictArrayFromJSON(dict_type, input_index_json,
input_dictionary_json);
+ const DictionaryArray& input_ref = checked_cast<const
DictionaryArray&>(*input);
+
+ auto expected =
+ DictArrayFromJSON(dict_type, expected_index_json,
expected_dictionary_json);
+
+ ASSERT_OK_AND_ASSIGN(std::shared_ptr<Array> actual, input_ref.Compact());
+ AssertArraysEqual(*expected, *actual, /*verbose=*/true);
+}
+
+TEST(TestDictionary, Compact) {
+ std::shared_ptr<arrow::DataType> type;
+ std::shared_ptr<arrow::DataType> dict_type;
+
+ for (const auto& index_type : all_dictionary_index_types()) {
+ ARROW_SCOPED_TRACE("index_type = ", index_type->ToString());
+
+ type = boolean();
+ dict_type = dictionary(index_type, type);
+
Review Comment:
No. We can't create a DictionaryArray with invalid index type.
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