Druid query-cache-total-hitRate is too slow, less than 40%(original data)

[zero-ligg]

Description

Druid version is 0.14
three broker configuration below：
druid.broker.cache.useCache=true
druid.broker.cache.populateCache=true
druid.cache.sizeInBytes=1G
druid.cache.type=caffeine

But i see query-cache-total-hitRate is about 0.2%, that is too slow.Please help me .

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[github-actions]

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