mkleen commented on code in PR #19599:
URL: https://github.com/apache/datafusion/pull/19599#discussion_r2673923330
##########
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>()
+ + size_of::<Precision<usize>>() * 2
Review Comment:
I tried that, but certain fields of datatypes are private, which are
necessary for scalar values. There is no way around it other than to first add
this to arrow-rs.
e.g.:
```rust
impl HeapSize for FixedSizeListArray {
fn heap_size(&self) -> usize {
self.data_type().heap_size() + // <- private
self.values().heap_size() +
self.nulls().unwrap().heap_size() + // <- private
self.value_length().heap_size() +
self.len().heap_size() // <- private
}
}
```
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