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Merge pull request #17291 from drag0nglass/patch-3
Update bitmap-functions.md
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我们使用RoaringBitmap实际存储位图对象,当基数小于或等于32时,它使用Set保存。当基数大于32时,它使用RoaringBitmap保存。这也是为什么低基数集的存储更快的原因。
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有关RoaringBitmap的更多信息,请参阅:[呻吟声](https://github.com/RoaringBitmap/CRoaring)。
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有关RoaringBitmap的更多信息,请参阅:[RoaringBitmap](https://github.com/RoaringBitmap/CRoaring)。
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## bitmapBuild {#bitmapbuild}
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