Crystrix commented on a change in pull request #12251:
URL: https://github.com/apache/arrow/pull/12251#discussion_r791742401
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File path: cpp/src/arrow/compute/kernels/hash_aggregate_test.cc
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@@ -2811,5 +2811,98 @@ TEST(GroupBy, SmallChunkSizeSumOnly) {
/*verbose=*/true);
}
+TEST(GroupBy, CountWithNullType) {
+ auto table =
+ TableFromJSON(schema({field("argument", null()), field("key",
int64())}), {R"([
+ [null, 1],
+ [null, 1]
+ ])",
+
R"([
+ [null, 2],
+ [null, 3],
+ [null, null],
+ [null, 1],
+ [null, 2]
+ ])",
+
R"([
+ [null, 2],
+ [null, null],
+ [null, 3]
+ ])"});
+
+ CountOptions all(CountOptions::ALL);
+ CountOptions only_valid(CountOptions::ONLY_VALID);
+ CountOptions only_null(CountOptions::ONLY_NULL);
+
+ for (bool use_exec_plan : {false, true}) {
+ for (bool use_threads : {true, false}) {
+ SCOPED_TRACE(use_threads ? "parallel/merged" : "serial");
+ ASSERT_OK_AND_ASSIGN(Datum aggregated_and_grouped,
+ GroupByTest(
+ {
+ table->GetColumnByName("argument"),
+ table->GetColumnByName("argument"),
+ table->GetColumnByName("argument"),
+ },
+ {table->GetColumnByName("key")},
+ {
+ {"hash_count", &all},
+ {"hash_count", &only_valid},
+ {"hash_count", &only_null},
+ },
+ use_threads, use_exec_plan));
+ SortBy({"key_0"}, &aggregated_and_grouped);
+
+ AssertDatumsEqual(ArrayFromJSON(struct_({
+ field("hash_count", int64()),
+ field("hash_count", int64()),
+ field("hash_count", int64()),
+ field("key_0", int64()),
+ }),
+ R"([
+ [3, 0, 3, 1],
+ [3, 0, 3, 2],
+ [2, 0, 2, 3],
+ [2, 0, 2, null]
+ ])"),
+ aggregated_and_grouped,
+ /*verbose=*/true);
+ }
+ }
+}
+
+TEST(GroupBy, CountWithNullTypeEmptyTable) {
Review comment:
No, it's just to make sure this corner case can be correctly processed.
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