How to hash a string to a bigint in presto?

@raphael_tillman 

In Presto, you can use the hash function to hash a string into a bigint value. Here's an example of how you can do this:

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SELECT hash('your_string_here') AS hashed_value;

This will return a bigint value representing the hash of the input string. You can use this hashed value in your queries for various purposes such as partitioning or grouping data.