哈希如何在配置单元配置中工作? [英] How hashing works in bucketing for hive?

问题描述

我知道Java中HashMap的哈希原理，所以想知道当我们将数据存储到各种存储桶中时，哈希对Hive的作用.

I know the hashing principal for HashMap in Java, so wanted to know that how the hashing works for the Hive while we bucketing the data in various bucket.

推荐答案

我最近不得不挖掘一些Hive源代码来自己解决这个问题.这是我发现的:

I recently had to dig into some Hive source code to figure this out for myself. Here's what I found:

对于整数字段，类似版本. html#hashCode()"rel =" noreferrer> Java的String hashCode .对多个值进行哈希处理时，哈希是

For an integer field, the hash is just the integer value. For a string, it uses a similar version of Java's String hashCode. When hashing multiple values, the hash is a similar version of Java’s List hashCode.

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