presto-hive/src/main/java/io/prestosql/plugin/hive/HiveSplitManager.java/HiveSplitManager/getHighMemorySplitSource
class HiveSplitManager:    @Managed
    @Nested
    public CounterStat getHighMemorySplitSource()
    {
        return highMemorySplitSourceCounter;
    }