wankunde opened a new pull request, #50871:
URL: https://github.com/apache/spark/pull/50871
### What changes were proposed in this pull request?
Add a config to determines whether fallback the complex expressions codegen.
### Why are the changes needed?
If the expression contains more than this of non-leaf expressions, the
generated method may too long to be JIT compiled.
For the test query, the filter operator contains 193 non-leaf expressions
and will generate about 3000 lines code, the code can not be JIT compiled and
will be very slow.
```sql
SELECT vv
FROM
(
SELECT vv, case vv
when '1' then '1'
when '2' then '2'
when '3' then '3'
when '4' then '4'
when '5' then '5'
when '6' then '6'
when '7' then '7'
when '8' then '8'
when '9' then '9'
when '10' then '10'
when '11' then '11'
when '12' then '12'
when '13' then '13'
when '14' then '14'
when '15' then '15'
when '16' then '16'
when '17' then '17'
when '18' then '18'
when '19' then '19'
when '20' then '20'
when '21' then '21'
when '22' then '22'
when '23' then '23'
when '24' then '24'
when '25' then '25'
when '26' then '26'
when '27' then '27'
when '28' then '28'
when '29' then '29'
when '30' then '30'
when '31' then '31'
when '32' then '32'
else ''
end as cv
FROM (
SELECT regexp_replace(trim(lower(
get_json_object(concat(v,'}'),'$$.s'))),'\\n','') AS vv
FROM values('a') as t(v)
) tmp
) t2
WHERE length(cv) > 0
AND cv not LIKE '%xxx%'
```
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Added UT
### Was this patch authored or co-authored using generative AI tooling?
No
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