Splitting array of string values into Rows Numbers Table Ref Error

Question

I am trying to create a table that queries individual database records, but splits out values from an associated array into individual rows for the individual database record. So far I have created the numbers table that has numerical rows up to 255, but when I try to join that table to a table where I am splitting the array by string in the number table order, I receive an error function split_part(character varying, "unknown", double precision) does not exist. Any idea what is off with my setup?

Note: I am using Amazon Redshift

Numbers Table:

Sample query results

number
1
2
3
4
...
255

Query

SELECT 
    p0.n 
    + p1.n*2 
    + p2.n * POWER(2,2) 
    + p3.n * POWER(2,3)
    + p4.n * POWER(2,4)
    + p5.n * POWER(2,5)
    + p6.n * POWER(2,6)
    + p7.n * POWER(2,7) 
    as number
  FROM 
    (SELECT 0 as n UNION SELECT 1) p0,
    (SELECT 0 as n UNION SELECT 1) p1,
    (SELECT 0 as n UNION SELECT 1) p2,
    (SELECT 0 as n UNION SELECT 1) p3,
    (SELECT 0 as n UNION SELECT 1) p4,
    (SELECT 0 as n UNION SELECT 1) p5,
    (SELECT 0 as n UNION SELECT 1) p6,
    (SELECT 0 as n UNION SELECT 1) p7

Parser table query:

Ideal query results

row_id, record_id, medium_name
1, 24, work
2, 24, test
3, 24, success

Query

SELECT row_number() over (order by 1) as row_id
        , test_lead.id as lead_id
        , split_part(test_lead.test_mediums, ', ', numbers.number) as medium_name
      FROM ${lead.SQL_TABLE_NAME} test_lead
      JOIN ${marketing_model_numbers.SQL_TABLE_NAME} numbers
      ON numbers.number <= regexp_count(test_lead.test_mediums, ',\\s') + 1

Array value structure:

["work", "test", "success"]

Answer 1

Your numbers.number is a double precision. But split_part() expects the third parameter to be an integer and the value isn't implicitly cast. Try to explicitly cast numbers.number.

...
, split_part(test_lead.test_mediums, ', ', numbers.number::integer) as medium_name
....