Github user davies commented on the pull request:
https://github.com/apache/spark/pull/13318#issuecomment-221793398
It was 0.70 (corrected), it's 30% lower after this patch. For the simplest
aggregate (one integer key and one integer value), the key-value pair need 40
bytes, the pointer array need 22+ bytes, becomes 32 bytes after the patch, it
will need 15% more memory. Before this patch, TimSort still allocate some
memory from heap (could OOM), so the difference will be even smaller.
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