#StandardSQL
WITH tableA AS (
SELECT ["T001", "T002", "T003"] AS T_id, [1, 5] AS L_id
UNION ALL
SELECT ["T008", "T009"] AS T_id, NULL AS L_id
)
SELECT * FROM tableA, UNNEST(L_id) AS unnest
When I executed this code, I expected the result such as that below.
RowNumber T-id L-id unnest
1 T001,T002,T003 1,5 1
2 T001,T002,T003 1,5 5
3 T004,T005 NULL NULL
But I get this result instead:
RowNumber T-id L-id unnest
1 T001,T002,T003 1,5 1
2 T001,T002,T003 1,5 5
I lost the third row. Then, I saw the official Google documentation, which states the following:
UNNEST treats NULL as follows.
・NULL and empty ARRAY generate zero rows.
・An ARRAY containing NULL generates a row containing a NULL value.
But I don't want to lose my null row.
How can I keep the null row?
Please tell me the solution...