Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/15637
Yes, but in its impl, it actually only supports above types.
```
@Override
public void add(Object item, long count) {
if (item instanceof String) {
addString((String) item, count);
} else {
addLong(Utils.integralToLong(item), count);
}
}
```
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