[michristofides]

You’re quite right, the example given doesn’t have bad row estimates, and other cells are highlighted in red/orange/yellow for different reasons (proportion of time taken, in the case shown).

For an intro to this that goes through several examples, I highly recommend a conference talk[1] by Josh Berkus in 2015/16 that he gave a few times. It has aged pretty well and I’ve not yet seen the basics covered better.

[1]: https://youtu.be/mCwwFAl1pBU

[eyelidlessness]

Thank you for validating that I’m not crazy for not seeing the things described in the article in its examples! It’s become kind of a running non-joke of “I don’t think I should be feeling impostor syndrome but I keep being scolded to read the EXPLAIN, it keeps being mystery meat every time I try, and I keep having better outcomes applying what I’ve learned every other way”.

If I have time this weekend I’ll check out the video.