Nik Everett

For folks playing along - we're pretty sure we're going to reduce the memory usage here. That's not the thing holding this up. The real question is "why didn't the...

> I might be wrong, but these are the main reason that I found so far that BytesRefBlockBuilder doesn't adjust circuit breaker size properly. `BytesRefBlockBuilder` is indeed pretty special here....

> `java.lang.ArithmeticException: long overflow` I imagine this is possible for any version. You do have to stick a far future date though. I don't think a blocker but would be...

The failing case is: `+292278829-09-20T01:30:20.154Z` + `P769Y9M15D`. That's the `year two hundred ninety two million, two hundred seventy eight thousand, eight hundred twenty nine` plus `seven hundred sixty nine` -...

I think this should replace #85185.

Sleeping on this the abstraction feels a little over designed - maybe premature. Maybe not because @romseygeek seemed to think it made sense with his plans. And it feels like...

> Sorry for my own drive-by comment, I found the logic in the last PR (#85185) a lot more focused and easy to understand. Would it make sense to start...

I wrote up a guide to making new functions about six months ago that's gone stale. I'll try and build another guide for it on Monday.

Here are some instructions for adding functions.

Elasticmachine, test this please.