mcshawn10 commented on code in PR #45384:
URL: https://github.com/apache/arrow/pull/45384#discussion_r1941491449
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cpp/src/arrow/compare.cc:
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@@ -381,23 +381,49 @@ class RangeDataEqualsImpl {
const int8_t* right_codes = right_.GetValues<int8_t>(1);
// Unions don't have a null bitmap
+ int64_t run_start = 0; // Start index of the current run
+
for (int64_t i = 0; i < range_length_; ++i) {
- const auto type_id = left_codes[left_start_idx_ + i];
- if (type_id != right_codes[right_start_idx_ + i]) {
+ const auto current_type_id = left_codes[left_start_idx_ + i];
+
+ if (current_type_id != right_codes[right_start_idx_ + i]) {
result_ = false;
break;
}
- const auto child_num = child_ids[type_id];
- // XXX can we instead detect runs of same-child union values?
- RangeDataEqualsImpl impl(
- options_, floating_approximate_, *left_.child_data[child_num],
- *right_.child_data[child_num], left_start_idx_ + left_.offset + i,
- right_start_idx_ + right_.offset + i, 1);
- if (!impl.Compare()) {
- result_ = false;
- break;
+ // Check if the current element breaks the run
+ if (i > 0 && current_type_id != left_codes[left_start_idx_ + i - 1]) {
+ // Compare the previous run
+ const auto previous_child_num = child_ids[left_codes[left_start_idx_ +
i - 1]];
+ int64_t run_length = i - run_start;
+
+ RangeDataEqualsImpl impl(
+ options_, floating_approximate_,
*left_.child_data[previous_child_num],
+ *right_.child_data[previous_child_num],
+ left_start_idx_ + left_.offset + run_start,
+ right_start_idx_ + right_.offset + run_start, run_length);
+
+ if (!impl.Compare()) {
+ result_ = false;
+ return Status::OK();
Review Comment:
thank you for the feedback! just implemented the suggestions
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