Continuous Integration

add snippets for joins and explain #1147

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Run time

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Job	Run time
lint	1m 6s
build (3.13)	2m 20s
build (pypy3.9)	2m 53s
build (3.9)	2m 25s
build (3.11)	2m 14s
build (3.10)	2m 20s
build (3.12)	2m 32s
	15m 50s