Where can I find a description of plan nodes?

I'm working my way through a postgres query plan for the first time.

I'm having some trouble be开发者_JAVA技巧cause I don't seem to be able to find any documentation that describes what each of the plan nodes are. In many cases, the name provides me with a reasonable guess, but in several the name of the plan node is too generic for me to have confidence in it.

Where can I find a list of types of plan nodes, with descriptions of each?

Chapter "56.1. Row Estimation Examples" explaines a lot, take a look.

Adding to Frank's answer, you might also want to peek at:

http://explain.depesz.com/

It reformats the plans in a more readable manner.