CuteChuanChuan commented on issue #3165:
URL:
https://github.com/apache/datafusion-comet/issues/3165#issuecomment-3906750613
I have a question about implementing map_filter.
Spark's `map_filter` requires lambda syntax:
```sql
SELECT map_filter(map(1, 0, 2, 2), (k, v) -> k > v)
After some rough browsing, I found that lambda support doesn't exist yet.
Questions:
1. Is there an existing plan or design for lambda/higher-order function
support?
2. What's the recommended approach for map_filter?
- Option A: Full lambda infrastructure (benefits transform, array_filter,
aggregate too)
- Option B: Special-case map_filter without general lambda support
- Option C: Different approach?
I'm happy to contribute to this. Just want to align on the approach first.
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