rluvaton commented on PR #18152:
URL: https://github.com/apache/datafusion/pull/18152#issuecomment-3448597124
Couple of questions:
1. Your solution **assume** that case expression evaluation are cheaper than
copy record batch, right?.
I think this assumption should be documented in the code.
2. Given this example:
```
CASE WHEN a IS NULL THEN "null"
WHEN a > 1 THEN "yes"
END
```
in case `a IS NULL` filtered 10% for example, do you **evaluate** `a > 1`
for the remaining 90% or 100%?
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