tustvold opened a new issue, #4025:
URL: https://github.com/apache/arrow-rs/issues/4025
**Describe the bug**
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Schema::contains states that it returns true if
> self.metadata is a superset of other.metadata
It then checks this with
```
other.metadata().iter().all(|(k, v)| {
match self.metadata().get(k) {
Some(s) => s == v,
None => false
}
})
```
This will instead return true if `self.metadata` is a subset of
`other.metadata`
**To Reproduce**
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Steps to reproduce the behavior:
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This appears to have been incorrect in the original implementation provided
by @houqp in
https://github.com/apache/arrow-rs/commit/a281c49194da4121386ab6211e42c0c1aa08008e.
**Expected behavior**
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**Additional context**
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