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https://issues.apache.org/jira/browse/ARROW-13154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Antoine Pitrou resolved ARROW-13154.
------------------------------------
Resolution: Fixed
Issue resolved by pull request 10599
[https://github.com/apache/arrow/pull/10599]
> [C++] Unions can not have 126 and 127 as type_codes
> ---------------------------------------------------
>
> Key: ARROW-13154
> URL: https://issues.apache.org/jira/browse/ARROW-13154
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Ying Zhou
> Assignee: Ying Zhou
> Priority: Minor
> Labels: pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Due to the following in builder_union.cc (Line 67-70)
>
> {color:#172b4d}{color}
> {code:java}
> type_id_to_children_.resize(union_type.max_type_code() + 1, nullptr);
> DCHECK_LT(
> type_id_to_children_.size(),
>
> static_cast<decltype(type_id_to_children_)::size_type>(UnionType::kMaxTypeCode));{code}
> {color:#172b4d}
>
> and type.cc (Line 640-644)
> {color}
> {code:java}
> uint8_t UnionType::max_type_code() const {
> return type_codes_.size() == 0
> ? 0
> : *std::max_element(type_codes_.begin(), type_codes_.end());
> }{code}
>
> In practice type codes of the union type must always be below or equal to
> 125 which is not intended behavior.
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