Jefffrey commented on code in PR #5573:
URL: https://github.com/apache/arrow-rs/pull/5573#discussion_r1547251589
##########
arrow-select/src/filter.rs:
##########
@@ -368,6 +378,86 @@ fn filter_array(values: &dyn Array, predicate:
&FilterPredicate) -> Result<Array
}
}
+fn filter_run_end_array<R: RunEndIndexType>(
+ ree_arr: &RunArray<R>,
+ pred: &FilterPredicate,
+) -> Result<ArrayRef, ArrowError> {
+ fn downcast_safe<A: RunEndIndexType, T: RunEndIndexType>(
+ re_arr: &RunArray<A>,
+ ) -> Option<&RunArray<T>> {
+ re_arr.as_any().downcast_ref::<RunArray<T>>()
+ }
+
+ if let Some(ree_array) = downcast_safe::<R, Int64Type>(ree_arr) {
+ let (run_ends, values) = filter_run_end_array_generic(ree_array,
pred)?;
+ let ree_arr: RunArray<Int64Type> =
+ RunArray::try_new(&PrimitiveArray::from(run_ends), &values)?;
+ Ok(Arc::new(ree_arr))
+ } else if let Some(ree_array) = downcast_safe::<R, Int32Type>(ree_arr) {
+ let (run_ends, values) = filter_run_end_array_generic(ree_array,
pred)?;
+ let ree_arr: RunArray<Int32Type> =
+ RunArray::try_new(&PrimitiveArray::from(run_ends), &values)?;
+ Ok(Arc::new(ree_arr))
+ } else if let Some(ree_array) = downcast_safe::<R, Int16Type>(ree_arr) {
+ let (run_ends, values) = filter_run_end_array_generic(ree_array,
pred)?;
+ let ree_arr: RunArray<Int16Type> =
+ RunArray::try_new(&PrimitiveArray::from(run_ends), &values)?;
+ Ok(Arc::new(ree_arr))
+ } else {
+ Err(ArrowError::CastError(
+ "Run ends for RunArray must be i16 or i32 or i64".to_string(),
+ ))
+ }
Review Comment:
```rust
let run_ends = PrimitiveArray::<R>::new(new_run_ends.into(), None);
let ree_arr = RunArray::try_new(&run_ends, &new_values)?;
let arr = Arc::new(ree_arr);
```
Something like this should work, since `PrimitiveArray::new` uses
`ScalarBuffer<<T as ArrowPrimitiveType>::Native>` which is exactly what you need
-
https://docs.rs/arrow/latest/arrow/array/struct.PrimitiveArray.html#method.new
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