-- smallint max lots
SELECT vec_to_max(smallints) FROM measurements WHERE sensor_id IN (1, 2, 3, 4);
-- smallint max none
SELECT vec_to_max(smallints) FROM measurements WHERE sensor_id = -1;
-- smallint max one null
SELECT vec_to_max(smallints) FROM measurements WHERE sensor_id = 1;
-- smallint max array of nulls
SELECT vec_to_max(smallints) FROM measurements WHERE sensor_id = 2;
-- smallint max one not-null
SELECT vec_to_max(smallints) FROM measurements WHERE sensor_id = 4;
-- smallint max array of nulls and one other
SELECT vec_to_max(smallints) FROM measurements WHERE sensor_id IN (2, 4);

-- int max lots
SELECT vec_to_max(ints) FROM measurements WHERE sensor_id IN (1, 2, 3, 4);
-- int max none
SELECT vec_to_max(ints) FROM measurements WHERE sensor_id = -1;
-- int max one null
SELECT vec_to_max(ints) FROM measurements WHERE sensor_id = 1;
-- int max array of nulls
SELECT vec_to_max(ints) FROM measurements WHERE sensor_id = 2;
-- int max one not-null
SELECT vec_to_max(ints) FROM measurements WHERE sensor_id = 4;
-- int max array of nulls and one other
SELECT vec_to_max(ints) FROM measurements WHERE sensor_id IN (2, 4);

-- bigint max lots
SELECT vec_to_max(bigints) FROM measurements WHERE sensor_id IN (1, 2, 3, 4);
-- bigint max none
SELECT vec_to_max(bigints) FROM measurements WHERE sensor_id = -1;
-- bigint max one null
SELECT vec_to_max(bigints) FROM measurements WHERE sensor_id = 1;
-- bigint max array of nulls
SELECT vec_to_max(bigints) FROM measurements WHERE sensor_id = 2;
-- bigint max one not-null
SELECT vec_to_max(bigints) FROM measurements WHERE sensor_id = 4;
-- bigint max array of nulls and one other
SELECT vec_to_max(bigints) FROM measurements WHERE sensor_id IN (2, 4);

-- real max lots
SELECT vec_to_max(reals) FROM measurements WHERE sensor_id IN (1, 2, 3, 4);
-- real max none
SELECT vec_to_max(reals) FROM measurements WHERE sensor_id = -1;
-- real max one null
SELECT vec_to_max(reals) FROM measurements WHERE sensor_id = 1;
-- real max array of nulls
SELECT vec_to_max(reals) FROM measurements WHERE sensor_id = 2;
-- real max one not-null
SELECT vec_to_max(reals) FROM measurements WHERE sensor_id = 4;
-- real max array of nulls and one other
SELECT vec_to_max(reals) FROM measurements WHERE sensor_id IN (2, 4);

-- float8 max lots
SELECT vec_to_max(floats) FROM measurements WHERE sensor_id IN (1, 2, 3, 4);
-- float8 max none
SELECT vec_to_max(floats) FROM measurements WHERE sensor_id = -1;
-- float8 max one null
SELECT vec_to_max(floats) FROM measurements WHERE sensor_id = 1;
-- float8 max array of nulls
SELECT vec_to_max(floats) FROM measurements WHERE sensor_id = 2;
-- float8 max one not-null
SELECT vec_to_max(floats) FROM measurements WHERE sensor_id = 4;
-- float8 max array of nulls and one other
SELECT vec_to_max(floats) FROM measurements WHERE sensor_id IN (2, 4);

-- numeric max lots
SELECT vec_to_max(nums) FROM measurements WHERE sensor_id IN (1, 2, 3, 4);
-- numeric max none
SELECT vec_to_max(nums) FROM measurements WHERE sensor_id = -1;
-- numeric max one null
SELECT vec_to_max(nums) FROM measurements WHERE sensor_id = 1;
-- numeric max array of nulls
SELECT vec_to_max(nums) FROM measurements WHERE sensor_id = 2;
-- numeric max one not-null
SELECT vec_to_max(nums) FROM measurements WHERE sensor_id = 4;
-- numeric max array of nulls and one other
SELECT vec_to_max(nums) FROM measurements WHERE sensor_id IN (2, 4);
-- numeric max data 01
-- results expected to match:
-- WITH di AS (
--   SELECT idx_i, max(val_i) AS max_i
--   FROM measurements2 d, unnest(d.data_i) WITH ORDINALITY AS a(val_i, idx_i)
--   GROUP BY idx_i
-- )
-- SELECT array_agg(max_i ORDER BY idx_i) AS data_i_max FROM di
SELECT vec_to_max(data_i) FROM measurements2;