Ryan Caudy

``` Full thread dump OpenJDK 64-Bit Server VM (17.0.7+7 mixed mode, sharing): Threads class SMR info: _java_thread_list=0x00007f7aa4002e80, length=79, elements={ 0x00007f7b6802e6f0, 0x00007f7b681ebea0, 0x00007f7b681ed350, 0x00007f7b681f2ba0, 0x00007f7b681f3f80, 0x00007f7b681f5470, 0x00007f7b681f6cf0, 0x00007f7b681f8340, 0x00007f7b682018c0, 0x00007f7b68235b30, 0x00007f7b68251650,...

`RegionedColumnSourceManager` should increment reference count to any `TableLocation` is adds. It should decrement reference count to any location it removes at the end of the cycle when it processed the...

This PR is intended to be merged ahead of or with #5707. It currently needs more unit testing. That should come along with the refreshing Iceberg changes.

Note, there may be conflicts due to https://github.com/deephaven/deephaven-core/pull/5942

Merged as part of #5707

Looks like this is unsigned, 64-bit. Supporting it would require reading into a Java `BigInteger` or some third-party type, both unappealing options for a high performance library. The alternative of...

That said, I think compromised support is better than no support. @jonathandune do you have a preference for your use case? `BigInteger` is probably the most natural answer here.

https://guava.dev/releases/20.0/api/docs/com/google/common/primitives/UnsignedLong.html is a 3rd party option.

We need to determine if this is useful enough in debugging situations to keep it at the current log level, or if we should drop it to avoid annoying users...

This is likely a performance loss with no gain for some cases (we need to track previous state for key columns, etc, and the code will be more complex). For...