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Posted to dev@arrow.apache.org by "Benjamin Kietzman (JIRA)" <ji...@apache.org> on 2019/05/10 13:24:00 UTC

[jira] [Created] (ARROW-5299) [C++] ListArray comparison is incorrect

Benjamin Kietzman created ARROW-5299:
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             Summary: [C++] ListArray comparison is incorrect
                 Key: ARROW-5299
                 URL: https://issues.apache.org/jira/browse/ARROW-5299
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Benjamin Kietzman
            Assignee: Benjamin Kietzman


Equality comparison for ListArray accounts for offsets incorrectly, so slices of ListArrays with identical offsets but differing values will sometimes compare equal.

For example, the following test fails:

{code}
TEST_F(TestListArray, ValuesEquality) {
  auto type = list(int32());
  auto left = ArrayFromJSON(type, "[[1, 2], [3, null], [5], []]");
  auto right = ArrayFromJSON(type, "[[1, 2], [3, null], [9], []]");

  AssertArraysEqual(*left->Slice(2), *right->Slice(2));
}
{code}



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