How hashing works in bucketing for hive?

Question

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.

Answer 1

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

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.