Continuous Integration

add snippets for joins and explain #1148

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Run time

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Job	Run time
lint	1m 11s
build (3.13)	2m 30s
build (3.11)	2m 31s
build (3.12)	2m 28s
build (3.10)	2m 24s
build (3.9)	2m 21s
build (pypy3.9)	2m 58s
	16m 23s