kou commented on code in PR #44252:
URL: https://github.com/apache/arrow/pull/44252#discussion_r1822027964
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cpp/src/arrow/record_batch.cc:
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@@ -465,6 +470,169 @@ Result<std::shared_ptr<RecordBatch>>
RecordBatch::ViewOrCopyTo(
return Make(schema_, num_rows(), std::move(copied_columns));
}
+namespace {
+struct EnumeratedStatistics {
+ int nth_statistics = 0;
+ bool start_new_column = false;
+ std::optional<int32_t> nth_column = std::nullopt;
+ const char* key = nullptr;
+ std::shared_ptr<DataType> type = nullptr;
+ ArrayStatistics::ValueType value = false;
+};
+using OnStatistics =
+ std::function<Status(const EnumeratedStatistics& enumerated_statistics)>;
+Status EnumerateStatistics(const RecordBatch& record_batch, OnStatistics
on_statistics) {
+ EnumeratedStatistics statistics;
+ statistics.nth_statistics = 0;
+ statistics.start_new_column = true;
+ statistics.nth_column = std::nullopt;
+ statistics.key = ARROW_STATISTICS_KEY_ROW_COUNT_EXACT;
Review Comment:
Let's keep this for now to demonstrate table/record batch level statistics.
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