Using a Postgres dataflow to split a comma-separated string into separate rows

Trying to split a comma-separated field into rows. Input looks like this:


JiraID   |   Zendesk IDs

1          |   5,6,7


Desired Output:

Jira ID | Zendesk ID

1             5

1             6

1             7


tried using unnest(string_to_array("Zendesk IDs", ',')::integer[]) 


but am getting errors that unnest(integer[]) not found.


Any other way?