wankunde opened a new pull request, #39780:
URL: https://github.com/apache/spark/pull/39780
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### What changes were proposed in this pull request?
Optimize CASE_WHEN and COALESCE SQL function, remove duplicate branches.
For example, we can remove the `id = 200` branch in CASE_WHEN function and
remove `id + 1` expression in COALESCE function:
```sql
SELECT
CASE WHEN id = 200 THEN 1
WHEN id = 200 THEN 2 -- same condition, can remove
WHEN id = 200 THEN 3 -- same condition, can remove
ELSE 0 END as c1,
coalesce(
id + 1,
id + 1, -- same expression, can remove
id) as c2
FROM t1
```
### Why are the changes needed?
Optimize CASE_WHEN and COALESCE SQL function
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Add UT
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