[GitHub] [arrow-rs] tustvold commented on a diff in pull request #3149: feat: `{Field,DataType}::size`

[GitBox <gi...@apache.org>]

tustvold commented on code in PR #3149:
URL: https://github.com/apache/arrow-rs/pull/3149#discussion_r1029202444


##########
arrow-schema/src/field.rs:
##########
@@ -459,6 +459,21 @@ impl Field {
             }
         }
     }
+
+    /// Return size of this instance in bytes.
+    ///
+    /// Includes the size of `Self`.
+    pub fn size(&self) -> usize {
+        std::mem::size_of_val(self) - std::mem::size_of_val(&self.data_type)
+            + self.data_type.size()
+            + self.name.capacity()
+            + (std::mem::size_of::<(String, String)>() * self.metadata.capacity())

Review Comment:
   I'm not sure how accurate this approximation is, but I imagine probably good enough to a first order



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