tustvold commented on code in PR #4042:
URL: https://github.com/apache/arrow-rs/pull/4042#discussion_r1161806455
##########
arrow-schema/src/datatype.rs:
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@@ -498,6 +498,29 @@ impl DataType {
}
}
}
+
+ /// Check to see if `self` is a superset of `other`
+ ///
+ /// If DataType is a nested type, then it will check to see if the nested
type is a superset of the other nested type
+ /// else it will check to see if the DataType is equal to the other
DataType
+ pub fn contains(&self, other: &DataType) -> bool {
+ match self {
+ DataType::List(field)
+ | DataType::LargeList(field)
+ | DataType::Map(field, _)
+ | DataType::FixedSizeList(field, _) =>
field.data_type().contains(other),
Review Comment:
No, adding fields is not supported. I agree the name is perhaps unhelpful.
It is basically used for testing if the layout of a given set of arrays is
compatible
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