The documentation for this statement shows the NULL/NOT NULL options as optional after the altering of the datatype. Through testing, we found a not nullable column will be changed to nullable if you alter the datatype and don't specify NOT NULL at the same time. Preferably, the action of changing the datatype without specifying the nullability should leave the nullability the same. At a minimum, the documentation should make clear the nullability will be forced to NULL when changing the datatype if not specified. This is not a blocker or much of an issue, but more of a recommendation.
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