Hi, I've been experimenting with the new reworked FDW API to get familiar with it. The postgres_fdw is a great source of knowledge (huge thanks to Shigeru Hanada, KaiGai Kohei and everyone else who made this happen), but in the end I had to draw some flow charts in Dia, to understand how exactly do the functions interact, pass private data etc. in various scenarios.
Attached is the set of flow charts, showing the sequence of callbacks for all the supported commands (i.e. SELECT, INSERT, UPDATE, DELETE, ANALYZE). Wouldn't it be useful to put something like this into the docs? I mean, the FDW API is not going to get any simpler, and for me this was a significant help. regards Tomas
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