[feature](statistics)Implement HLL with 128 buckets to support statistics cache. #34124
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englefly
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Apr 25, 2024
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PR approved by at least one committer and no changes requested. |
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Doris HLL implementation contains 16384 buckets, which is too much for statistics. This pr implement HLL128 with only 128 buckets and provide a method of converting 16384 buckets to 128 buckets. HLL128 will consume much less memory and the estimate accuracy is higher than 90% which is acceptable for statistics.
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