Alter column datatype draft #22379

Job	Run time
unit-test (17, ubuntu-latest, datanode)	33m 26s
unit-test (17, ubuntu-latest, others)	17m 46s
unit-test (17, windows-latest, others)	23m 48s
unit-test (17, windows-latest, datanode)	42m 56s
	1h 57m 56s

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