[
https://issues.apache.org/jira/browse/ARROW-11051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ziru Niu updated ARROW-11051:
-----------------------------
Description:
Minimal example
{quote}use arrow::\{array::PrimitiveArray, datatypes::Int64Type};
fn main() {
let mut s = vec![];
for _ in 0..32
{ s.push(Some(1i64)); s.push(None); }
let v: PrimitiveArray<Int64Type> = s.into();
dbg!(arrow::compute::sum(&v));
}
{quote}
{quote}
// The following code in `compute::sum` is wrong. The bit mask is checked
reversed.
remainder.iter().enumerate().for_each(|(i, value)| {
if remainder_bits & (1 << i) != 0 {
remainder_sum = remainder_sum + *value;
}
});
{quote}
was:
Minimal example
```
use arrow::\{array::PrimitiveArray, datatypes::Int64Type};
fn main() {
let mut s = vec![];
for _ in 0..32 {
s.push(Some(1i64));
s.push(None);
}
let v: PrimitiveArray<Int64Type> = s.into();
dbg!(arrow::compute::sum(&v));
}
```
The following code in `compute::sum` is wrong. The bit mask is checked reversed.
```
remainder.iter().enumerate().for_each(|(i, value)| {
if remainder_bits & (1 << i) != 0 {
remainder_sum = remainder_sum + *value;
}
});
```
> [Rust] Array sum result is wrong with remainder fields
> ------------------------------------------------------
>
> Key: ARROW-11051
> URL: https://issues.apache.org/jira/browse/ARROW-11051
> Project: Apache Arrow
> Issue Type: Bug
> Components: Rust
> Affects Versions: 2.0.0
> Environment: Ubuntu 20.04. rustc nightly
> Reporter: Ziru Niu
> Priority: Blocker
>
> Minimal example
>
> {quote}use arrow::\{array::PrimitiveArray, datatypes::Int64Type};
> fn main() {
> let mut s = vec![];
> for _ in 0..32
> { s.push(Some(1i64)); s.push(None); }
> let v: PrimitiveArray<Int64Type> = s.into();
> dbg!(arrow::compute::sum(&v));
> }
>
> {quote}
>
> {quote}
> // The following code in `compute::sum` is wrong. The bit mask is checked
> reversed.
> remainder.iter().enumerate().for_each(|(i, value)| {
> if remainder_bits & (1 << i) != 0 {
> remainder_sum = remainder_sum + *value;
> }
> });
>
> {quote}
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