martin-g commented on code in PR #19599:
URL: https://github.com/apache/datafusion/pull/19599#discussion_r2658389431


##########
datafusion/common/src/stats.rs:
##########
@@ -321,6 +321,13 @@ impl Statistics {
         }
     }
 
+    /// Returns the memory size in bytes.
+    pub fn heap_size(&self) -> usize {
+        // column_statistics + num_rows + total_byte_size
+        self.column_statistics.capacity() * size_of::<ColumnStatistics>()

Review Comment:
   deepsize seems abandoned:
   * https://github.com/Aeledfyr/deepsize/issues/38
   * https://github.com/Aeledfyr/deepsize/issues/43
   
   I haven't used any of the following but they look better maintained:
   * https://github.com/nhtyy/deepsize2
   * https://github.com/bircni/get-size2



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