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Posted to jira@arrow.apache.org by "Ziru Niu (Jira)" <ji...@apache.org> on 2020/12/28 19:05:00 UTC
[jira] [Updated] (ARROW-11051) [Rust] Array sum result is wrong
with remainder fields
[ https://issues.apache.org/jira/browse/ARROW-11051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ziru Niu updated ARROW-11051:
-----------------------------
Priority: Blocker (was: Critical)
> [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
> ```
> 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;
> }
> });
> ```
>
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