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Checks whether a value is not NULL. Returns 1 if not NULL, 0 otherwise.

func.isnotnull(<expr>)
func.isnotnull(1)
┌───┐
│ 1 │
└───┘
ISNOTNULL(<expr>)
SELECT ISNOTNULL(1);
┌───┐
│ 1 │
└───┘