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In the Usage section, the paragraph describing window-spec currently reads: “If the window-spec does not contain an ORDER BY then the result is arbitrary. If there is no window-spec, then the result is arbitrary.”
The paragraph should read: “If the window-spec does not contain an ORDER BY expression, or if the ORDER BY expression is not precise enough to guarantee a unique ordering, then the result is arbitrary. If there is no window-spec, then the result is arbitrary.”
