Casting string to int i.e. the string "res" - sql

Question

I have a column in a table which is type array<string>. The table is partitioned daily since 2018-01-01. At some stage, the values in the array goes from strings to integers. The data looks like this:
| yyyy_mm_dd | h_id | p_id | con |
|------------|-------|------|---------------|
| 2018-10-01 | 52988 | 1 | ["res", "av"] |
| 2018-10-02 | 52988 | 1 | ["1","2"] |
| 2018-10-03 | 52988 | 1 | ["1","2"] |
There is a mapping between the strings and integers. "res" maps to 1 and "av" maps to 2 etc. However, I've written a query to perform some logic. Here is a snippet (subquery) of it:
SELECT
t.yyyy_mm_dd,
t.h_id,
t.p_id,
CAST(e.con AS INT) AS api
FROM
my_table t
LATERAL VIEW EXPLODE(con) e AS con
My problem is that this doesn't work for the earlier dates when strings were used instead of integers. Is there anyway to select con and remap the strings to integers so the data is across all partitions?
Expected output:
| yyyy_mm_dd | h_id | p_id | con |
|------------|-------|------|---------------|
| 2018-10-01 | 52988 | 1 | ["1","2"] |
| 2018-10-02 | 52988 | 1 | ["1","2"] |
| 2018-10-03 | 52988 | 1 | ["1","2"] |
Once the values selected are all integers (within a string array), then the CAST(e.con AS INT) will work
Edit: To clarify, I will put the solution as a subquery before I use lateral view explode. This way I am exploding on a table where all partitions have integers in con. I hope this makes sense.

Answer 1

CAST(e.api as INT) returns NULL if not possible to cast. collect_list will collect an array including duplicates and without NULLs. If you need array without duplicated elements, use collect_set().
SELECT
t.yyyy_mm_dd,
t.h_id,
t.p_id,
collect_list(--array of integers
--cast case as string if you need array of strings
CASE WHEN e.api = 'res' THEN 1
WHEN e.api = 'av' THEN 2
--add more cases
ELSE CAST(e.api as INT)
END
) as con
FROM
my_table t
LATERAL VIEW EXPLODE(con) e AS api
GROUP BY t.yyyy_mm_dd, t.h_id, t.p_id