BIGQUERY An internal error occurred and the request could not be completed Error: 80038528 - sql

Question

I am trying to install a function. I don't understand what the problem is. I can install correctly when:
I delete the pivot
I use the Table and not the unnest only (so from the table, unnest(a))
CREATE OR REPLACE FUNCTION `dataset.function_naming` (a ARRAY<STRUCT<ROW_ID STRING, KEY STRING, VALUE STRING>>, id_one STRING, id_two STRING, start_date DATE, end_date DATE) RETURNS INT64
AS (
with tmp1 as (
select ROW_ID,X,Y,Z,W
from
(
select prop.ROW_ID,prop.KEY, prop.VALUE
from unnest(a) prop
where prop.KEY in ('X','Y','Z','W')
)
PIVOT
(
MAX(VALUE)
FOR UPPER(KEY) in('X','Y','Z','W')
) as PIVOT
)
select case when X is not null then 1,
when Y is not null then 2,
when Z is not null then 2,
when W is not null then 2
else 0
from tmp1
);
Thanks all.

Answer 1

There are few minor issues I see in your code.
missing extra (...) around function body
extra commas (,) within case statement
So, try below
CREATE OR REPLACE FUNCTION `dataset.function_naming` (
a ARRAY<STRUCT<ROW_ID STRING, KEY STRING, VALUE STRING>>,
id_one STRING,
id_two STRING,
start_date DATE,
end_date DATE
) RETURNS INT64
AS ((
with tmp1 as (
select ROW_ID,X,Y,Z,W
from
(
select prop.ROW_ID,prop.KEY, prop.VALUE
from unnest(a) prop
where prop.KEY in ('X','Y','Z','W')
)
PIVOT
(
MAX(VALUE)
FOR UPPER(KEY) in('X','Y','Z','W')
) as PIVOT
)
select case when X is not null then 1
when Y is not null then 2
when Z is not null then 2
when W is not null then 2
else 0
end
from tmp1
));

Answer 2

Seams there is an internal issue when using pivots and the unnest on the array. You can use the following, that executes the same logic, and also, create an case on issue tracker, as a BigQuery issue with Google cloud Support.
CREATE OR REPLACE FUNCTION `<dataset>.function_naming` (
a ARRAY<STRUCT<ROW_ID STRING, KEY STRING, VALUE STRING>>,
id_one STRING,
id_two STRING,
start_date DATE,
end_date DATE
) RETURNS INT64
AS (( WITH tmp AS (
SELECT
CASE
WHEN KEY="X" THEN 1
WHEN KEY="Y" THEN 2
WHEN KEY="Z" THEN 2
WHEN KEY="W" THEN 2
ELSE
0
END
teste_column
#-- FROM ( SELECT UPPER(prop.KEY) KEY, MAX(prop.VALUE) VALUE FROM -- following your query patern, but not really necessary
FROM ( SELECT UPPER(prop.KEY) KEY FROM
UNNEST(a) prop
WHERE
UPPER(key) IN ('X', 'Y', 'Z', 'W')
GROUP BY key )
ORDER BY teste_column DESC LIMIT 1 )
SELECT * FROM tmp
UNION ALL
SELECT 0 teste_column
FROM (SELECT 1)
LEFT JOIN tmp
ON FALSE
WHERE NOT EXISTS ( SELECT 1 FROM tmp)
));
#--- Testing the function:
select `<project>.<dataset>.function_naming`([STRUCT("1" AS ROW_ID, "x" AS KEY, "10"AS VALUE), STRUCT("1" AS ROW_ID, "x" AS KEY, "20"AS VALUE), STRUCT("1" AS ROW_ID, "w" AS KEY, "20"AS VALUE), STRUCT("1" AS ROW_ID, "y" AS KEY, "20"AS VALUE)], "1", "2", "2022-12-10", "2022-12-10")