respect nulls
clausefirst_value(<expr> ignore nulls)
first_value(<expr>, 'ignore nulls')
last_value(<expr> ignore nulls)
last_value(<expr>, 'ignore nulls')
T617, “FIRST_VALUE and LAST_VALUE functions” is defined as optional feature in ISO/IEC 9075:2016-2. It first appeared in SQL:2011.0
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