[jira] [Assigned] (ARROW-6425) ValidateArray fail for slice of list array

["Benjamin Kietzman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Kietzman reassigned ARROW-6425:
----------------------------------------

    Assignee: Benjamin Kietzman

> ValidateArray fail for slice of list array 
> -------------------------------------------
>
>                 Key: ARROW-6425
>                 URL: https://issues.apache.org/jira/browse/ARROW-6425
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 0.14.1
>            Reporter: Yan Zhou
>            Assignee: Benjamin Kietzman
>            Priority: Major
>
> The ValidateArray function fails for slice of list array (and MapArray I believe though haven't tested it yet). The validation will only pass for an unsliced array or the last slice.
>  
> For example,
>  
>  
> {code:java}
> auto value_builder = std::make_shared<::arrow::DoubleBuilder>();
>     ::arrow::ListBuilder builder(
>         ::arrow::default_memory_pool(), value_builder);
>     auto status = builder.Append(true);
>     status = value_builder->Append(1);
>     status = builder.Append(true);
>     status = value_builder->Append(2);
>     std::shared_ptr<::arrow::Array> list;
>     status = builder.Finish(&list);
>     std::cout << ::arrow::ValidateArray(*list).ok() << std::endl;
>     std::cout << ::arrow::ValidateArray(*list->Slice(0, 1)).ok() << std::endl;
>     std::cout << ::arrow::ValidateArray(*list->Slice(1, 1)).ok() << std::endl;
>  {code}
>  
> This will print 1, 0, 1.
>  
> The problem lies in array.cc around line 1167
>  
> {code:java}
>     const int32_t last_offset = array.value_offset(array.length());
>     if (array.values()->length() != last_offset) {
>       return Status::Invalid("Final offset invariant not equal to values length: ",
>                              last_offset, "!=", array.values()->length());
>     }
> {code}
> Here values() does not account for the array offset and thus its length is the whole array while value_offset and array.length() will account for that offset.



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