pitrou commented on a change in pull request #10969:
URL: https://github.com/apache/arrow/pull/10969#discussion_r693934168
##########
File path: cpp/src/parquet/arrow/path_internal_test.cc
##########
@@ -170,6 +170,24 @@ TEST_F(MultipathLevelBuilderTest,
NullableSingleListWithAllNullsLists) {
/*rep_levels=*/std::vector<int16_t>(4, 0));
}
+TEST_F(MultipathLevelBuilderTest, EmptyLists) {
+ // ARROW-13676 - ensure no out of bounds list memory accesses.
+ auto entries = field("Entries", ::arrow::int64());
+ auto list_type = list(entries);
Review comment:
Can you add a "translates to parquet schema" comment as above?
##########
File path: cpp/src/parquet/arrow/path_internal.cc
##########
@@ -342,7 +341,9 @@ class ListPathNode {
*child_range = selector_.GetRange(range->start);
while (child_range->Empty() && !range->Empty()) {
++range->start;
- *child_range = selector_.GetRange(range->start);
+ if (!range->Empty()) {
+ *child_range = selector_.GetRange(range->start);
+ }
}
Review comment:
Would be nice to clean up the repetition of conditionals here, for
example:
```c++
int64_t empty_elements = 0;
do {
*child_range = selector_.GetRange(range->start++);
if (!child_range->Empty()) {
break;
}
++empty_elements;
} while (!range->Empty());
```
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