Ngone51 commented on pull request #32790:
URL: https://github.com/apache/spark/pull/32790#issuecomment-866510223
@mridulm Interesting example! I also investigate a bit on it. Looks like all
the elements of the underlying array has been nulled out but remain the array
refrence unchanged. So its size doesn't change. But the memory usage shouldn't
be the same as before but it's also not empty since `null` still takes a bit
memory.
```java
public void clear() {
Node<K,V>[] tab;
modCount++;
if ((tab = table) != null && size > 0) {
size = 0;
for (int i = 0; i < tab.length; ++i)
tab[i] = null;
}
}
```
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