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remove unnecessary import
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src/main/java/io/mycat/route/function/PartitionByRangeDateHash.java

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import java.util.TimeZone;
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import java.lang.Math;
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/**
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* 先根据日期分组,再根据时间hash使得短期内数据分布的更均匀
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* 优点可以避免扩容时的数据迁移,又可以一定程度上避免范围分片的热点问题

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