alamb commented on code in PR #16346:
URL: https://github.com/apache/datafusion/pull/16346#discussion_r2138985658
##########
datafusion/functions-aggregate/src/array_agg.rs:
##########
@@ -313,7 +315,11 @@ impl Accumulator for ArrayAggAccumulator {
};
if !val.is_empty() {
- self.values.push(val);
+ // The ArrayRef might be holding a reference to its original input
buffer, so
+ // storing it here directly copied/compacted avoids over
accounting memory
+ // not used here.
+ self.values
+ .push(make_array(copy_array_data(&val.to_data())));
Review Comment:
I found this code confusing at first too so I tried to add some additional
documentation
- https://github.com/apache/datafusion/pull/16361
Another thing I found might make this code easier to understand would be to
refactor this into a function so it looks more like
```suggestion
.push(copy_array(val))
```
Or something like that
```rust
/// Copies an array to a new array with mimimal memory overhead
fn copy_array(array: &dyn Array) -> ArrayRef {
..
}
```
Or something like that .
This is definitely not required just something that occured to me while
reviewing
##########
datafusion/functions-aggregate/src/array_agg.rs:
##########
@@ -980,6 +994,56 @@ mod tests {
Ok(())
}
+ #[test]
Review Comment:
I verified these tests cover the code in this PR -- they fail without the
changes in the PR
```
assertion `left == right` failed
left: 2652
right: 732
```
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