ex791857 commented on issue #13801:
URL: https://github.com/apache/arrow/issues/13801#issuecomment-1206112423
I looked into Arrow source code and tracked to
```CPP
int Schema::num_fields() const { return
static_cast<int>(impl_->fields_.size()); }
```
Maybe impl_ is a nullptr which causes a segmentation fault. But impl_ should
be initialized when constructing the Schema
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