Cerdore commented on PR #39888:
URL: https://github.com/apache/arrow/pull/39888#issuecomment-1921759196
MapType::ToString() don't show the metadata currently. It use
type().ToString() and field.name().
I didn't change here.
```
const auto print_field_name = [](std::ostream& os, const Field& field,
const char* std_name) {
if (field.name() != std_name) {
os << " ('" << field.name() << "')";
}
};
const auto print_field = [&](std::ostream& os, const Field& field,
const char* std_name) {
os << field.type()->ToString(show_metadata);
print_field_name(os, field, std_name);
};
```
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