How do I split a duration of time into hourly intervals in BigQuery?

Question

This is my table.

Location	Date	Employee	start	end
A	2021-01-01	A1	10	15
A	2021-01-01	A1	15	16
B	2021-01-01	B1	16	21
C	2021-01-01	C1	11	15

Here is the expected output:

Location	Date	Employee	start	end
A	2021-01-01	A1	10	15
A	2021-01-01	A1	11	15
A	2021-01-01	A1	12	15
A	2021-01-01	A1	13	15
A	2021-01-01	A1	14	15
A	2021-01-01	A1	15	15
A	2021-01-01	A1	15	16
A	2021-01-01	A1	16	16
B	2021-01-01	B1	16	21
B	2021-01-01	B1	17	21
B	2021-01-01	B1	18	21
B	2021-01-01	B1	19	21
B	2021-01-01	B1	20	21
B	2021-01-01	B1	21	21
C	2021-01-01	C1	11	15
C	2021-01-01	C1	12	15
C	2021-01-01	C1	13	15
C	2021-01-01	C1	14	15
C	2021-01-01	C1	15	15

Please help me how to split like this in BigQuery.

Answer 1

SELECT * EXCEPT(t) REPLACE(t AS start)
  FROM my_table, UNNEST(GENERATE_ARRAY(start, `end`)) t
 ORDER BY Location, start;

Query results:

+----------+------------+----------+-------+-----+
| Location |    Date    | Employee | start | end |
+----------+------------+----------+-------+-----+
| A        | 2021-01-01 | A1       |    10 |  15 |
| A        | 2021-01-01 | A1       |    11 |  15 |
| A        | 2021-01-01 | A1       |    12 |  15 |
| A        | 2021-01-01 | A1       |    13 |  15 |
| A        | 2021-01-01 | A1       |    14 |  15 |
| A        | 2021-01-01 | A1       |    15 |  15 |
| A        | 2021-01-01 | A1       |    15 |  16 |
| A        | 2021-01-01 | A1       |    16 |  16 |
| B        | 2021-01-01 | B1       |    16 |  21 |
| B        | 2021-01-01 | B1       |    17 |  21 |
| B        | 2021-01-01 | B1       |    18 |  21 |
| B        | 2021-01-01 | B1       |    19 |  21 |
| B        | 2021-01-01 | B1       |    20 |  21 |
| B        | 2021-01-01 | B1       |    21 |  21 |
| C        | 2021-01-01 | C1       |    11 |  15 |
| C        | 2021-01-01 | C1       |    12 |  15 |
| C        | 2021-01-01 | C1       |    13 |  15 |
| C        | 2021-01-01 | C1       |    14 |  15 |
| C        | 2021-01-01 | C1       |    15 |  15 |
+----------+------------+----------+-------+-----+