[
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}
dependency
{quote}arrow = \{version = "2", features = ["simd"]}
{quote}
The following code in `compute::sum` is wrong. The bit mask is checked reversed.
{quote} remainder.iter().enumerate().for_each(|(i, value)| \{
if remainder_bits & (1 << i) != 0 \{
remainder_sum = remainder_sum + *value;
}
});
{quote}
was:
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}
Summary: [Rust] Array sum result is wrong with remainder fields when
simd is on (was: [Rust] Array sum result is wrong with remainder fields)
> [Rust] Array sum result is wrong with remainder fields when simd is on
> ----------------------------------------------------------------------
>
> 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: Major
>
> 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}
> dependency
> {quote}arrow = \{version = "2", features = ["simd"]}
> {quote}
> The following code in `compute::sum` is wrong. The bit mask is checked
> reversed.
> {quote} remainder.iter().enumerate().for_each(|(i, value)| \{
> if remainder_bits & (1 << i) != 0 \{
> remainder_sum = remainder_sum + *value;
> }
> });
>
> {quote}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
