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https://issues.apache.org/jira/browse/ARROW-7985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou reassigned ARROW-7985:
-------------------------------------
Assignee: Antoine Pitrou
> [C++] ListBuilder.Finish fails if underlying value builder is empty and
> .Reserve'd
> ----------------------------------------------------------------------------------
>
> Key: ARROW-7985
> URL: https://issues.apache.org/jira/browse/ARROW-7985
> Project: Apache Arrow
> Issue Type: Bug
> Affects Versions: 0.15.1
> Reporter: John Jenkins
> Assignee: Antoine Pitrou
> Priority: Major
>
> Here's a reproduction:
> {code:java}
> #include <arrow/builder.h>
> #include <arrow/status.h>
> #include <iostream>
> int main() {
> arrow::ListBuilder lb(arrow::default_memory_pool(),
> std::unique_ptr<arrow::ArrayBuilder>(new arrow::Int32Builder()));
> lb.value_builder()->Reserve(100); // bug
> lb.Append();
> std::shared_ptr<arrow::Array> ar;
> arrow::Status st = lb.Finish(&ar);
> if (!st.ok()) {
> std::cerr << st << '\n';
> return 1;
> }
> }
> {code}
> The output is
> {noformat}
> Invalid: Resize cannot downsize{noformat}
> The Resize call is made at builder_nested.h, line 115. There's a note there
> about ARROW-2744. Perhaps the fix is to look at capacity rather than length?
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