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https://issues.apache.org/jira/browse/ARROW-15228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17467224#comment-17467224
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Antoine Pitrou commented on ARROW-15228:
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This is expected, {{Reserve}} only reserves space for the indices, you also
need to reserve space for the data by calling {{ReserveData}}.
> StringBuilder UnsafeAppend causes EXC_BAD_ACCESS
> ------------------------------------------------
>
> Key: ARROW-15228
> URL: https://issues.apache.org/jira/browse/ARROW-15228
> Project: Apache Arrow
> Issue Type: Improvement
> Reporter: Will Ayd
> Priority: Minor
>
> It seems that StringBuilder->UnsafeAppend produces a memory violation. This
> is on macOS Monterey with an intel chip if it matters. Below is a sample
> program that will reproduce the error:
>
> ```cpp
> #include <arrow/api.h>
> arrow::Status RunMain(int argc, char** argv) {
> auto builder = std::make_shared<arrow::StringBuilder>();
> ARROW_RETURN_NOT_OK(builder->Reserve(1));
> builder->UnsafeAppend(std::string("a"));
> return arrow::Status::OK();
> }
> int main(int argc, char** argv) {
> arrow::Status st = RunMain(argc, argv);
> if (!st.ok()) {
> return 1;
> }
> return 0;
> }
> ```
> I could not reproduce with another builder type
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