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EnumerableUncollect throws NPE when an input has element = ((List) null)
SELECT * FROM UNNEST(CAST(null AS INTEGER ARRAY))
In a real situation, it can appear if to use left join. For example:
SELECT ARRAY(SELECT * FROM UNNEST(t.x)) FROM (VALUES(1)) LEFT JOIN (SELECT ARRAY as x, 2 as y) t ON t.y = 1
GitHub Pull Request #2793