Add UUID type and operators

[Praveen2112]

No description provided.

[pgagnon]

@Praveen2112 There is an extra file in your commit (presto-main/hs_err_pid39366.log) that I don't think you intended to add.

[Praveen2112]

@pgagnon Thanks for pointing it out. Have removed it.

[electrum]

Did a quick review and it looks good. Please add this to the types documentation, like IP address.

[dain]

@electrum any thoughts on what we do about the existing uuid function: https://github.com/prestosql/presto/blob/master/presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/udf/AccumuloStringFunctions.java#L33-L39

[martint]

For acronyms, we capitalize the first letter and use lower case for the rest when used in class or method names (URL -> Url, HTTP -> Http). So, in this case: UuidOperators

[Praveen2112]

Moved to the above format

[electrum]

@dain I’m didn’t know that existed, and it’s not documented. We could replace it with a function that returns the new type. PostgreSQL has more specifically named functions like uuid_generate_v4, but given that random is the most common type, it seems fine to use uuid over a more specific name like uuid_random, as that is the most common type (and likely the only one we will ever need to support).

[Praveen2112]

@electrum Have handled all the commits. Please let me know if there are any more changes.

[electrum]

Merged, thanks!