Interacting with Maps[]?

[Jonathan Coveney]

I'm just curious how people usually interact with Maps? Do you write UDFs
that do interesting things with the maps and simply take advantage of the
fact that pig can deal with datatypes, or do you use java's functions on a
pig level? For things like constructing maps, doing a filter on whether a
given key or value is in a map, etc, just curious what people do. I looked
around and didn't see too much on it, if there's some documentation on use
I'd love to see it!