bkietz opened a new pull request #9267:
URL: https://github.com/apache/arrow/pull/9267
```c++
/tmp/apache-arrow-20210116-6233-1jyrhk8/apache-arrow-3.0.0/cpp/src/arrow/dataset/expression.cc
/tmp/apache-arrow-20210116-6233-1jyrhk8/apache-arrow-3.0.0/cpp/src/arrow/dataset/expression.cc:684:30:
error: default initialization of an object of const type 'const
arrow::Datum' without a user-provided default constructor
static const Datum ignored_input;
```
Datum defines a default constructor but it doesn't seem to be found for
const/constexpr decls
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