Yan Zhou created ARROW-6425:
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Summary: 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
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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