eldenmoon commented on code in PR #12293:
URL: https://github.com/apache/doris/pull/12293#discussion_r962170494
##########
be/src/olap/rowset/segment_v2/column_reader.cpp:
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@@ -481,13 +481,38 @@ Status ArrayFileColumnIterator::next_batch(size_t* n,
vectorized::MutableColumnP
}
auto& column_offsets =
static_cast<vectorized::ColumnArray::ColumnOffsets&>(*column_offsets_ptr);
- auto& offsets_data = column_offsets.get_data();
- for (ssize_t i = start; i < offsets_data.size(); ++i) {
- offsets_data[i] += offsets_data[i - 1]; // -1 is ok
+ size_t num_items = 0;
+ if (_length_iterator->get_current_page()->next_array_item_ordinal > 0) {
+ // use offsets info
+ if (_length_iterator->get_current_page()->has_remaining()) {
+ // peek read one more to get the last array's length
+ size_t i = 1;
+ ordinal_t save = _length_iterator->get_current_ordinal();
+ RETURN_IF_ERROR(
+ _length_iterator->next_batch(&i, column_offsets_ptr,
&offsets_has_null));
+ RETURN_IF_ERROR(_length_iterator->seek_to_ordinal(save));
+ } else {
+ column_offsets_ptr->insert(
+
_length_iterator->get_current_page()->next_array_item_ordinal);
+ }
+
+ auto& offsets_data = column_offsets.get_data();
+ num_items = offsets_data.back() - offsets_data[start];
+ // caculate real offsets
+ for (ssize_t i = start; i < offsets_data.size() - 1; ++i) {
+ offsets_data[i] = offsets_data[i - 1] + (offsets_data[i + 1] -
offsets_data[i]);
+ }
+ column_offsets.pop_back(1);
+ } else {
+ // for compability
+ auto& offsets_data = column_offsets.get_data();
+ for (ssize_t i = start; i < offsets_data.size(); ++i) {
+ offsets_data[i] += offsets_data[i - 1]; // -1 is ok
+ }
+ num_items = offsets_data.back() - offsets_data[start - 1];
Review Comment:
that's a good suggestion
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