gabotechs commented on code in PR #16816:
URL: https://github.com/apache/datafusion/pull/16816#discussion_r2223443238
##########
datafusion/functions-aggregate/src/array_agg.rs:
##########
@@ -315,11 +313,7 @@ impl Accumulator for ArrayAggAccumulator {
};
if !val.is_empty() {
- // 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 don't think we will be using more memory. Right now the current code is in
an intermediate state where only some of the accumulations in
`ArrayAggAccumulator` are being compacted
(https://github.com/apache/datafusion/pull/16346, which is merged) and some
other don't (https://github.com/apache/datafusion/pull/16519, which was not
merged due to performance concerns).
So most likely the buffers that bake the accumulated data are still being
retained anyways, because https://github.com/apache/datafusion/pull/16519 was
not merged.
If any, this PR should reduce memory usage, as we are no longer copying
data, and improve accounting, as we are not double-counting several times the
buffers that bake the accumulated data.
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