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Posted to issues@arrow.apache.org by "Andrew Lamb (Jira)" <ji...@apache.org> on 2020/09/29 15:51:00 UTC
[jira] [Created] (ARROW-10136) [Rust][Arrow] Nulls are transformed
into "" after filtering for StringArray
Andrew Lamb created ARROW-10136:
-----------------------------------
Summary: [Rust][Arrow] Nulls are transformed into "" after filtering for StringArray
Key: ARROW-10136
URL: https://issues.apache.org/jira/browse/ARROW-10136
Project: Apache Arrow
Issue Type: Bug
Reporter: Andrew Lamb
Assignee: Andrew Lamb
When I use the filter kernel with Null strings, any input column that was Null turns into an empty string after filtering.
For example, this test (in filter.rs) should pass:
{code}
#[test]
fn test_filter_string_array_with_null() {
let a = StringArray::from(vec![Some("hello"), None, Some("world"), None]);
let b = BooleanArray::from(vec![true, false, false, true]);
let c = filter(&a, &b).unwrap();
let d = c.as_ref().as_any().downcast_ref::<StringArray>().unwrap();
assert_eq!(2, d.len());
assert_eq!("hello", d.value(0));
assert_eq!(true, d.is_null(1));
}
{code}
But instead it fails (the second element in the output array should be null )
{code}
---- compute::kernels::filter::tests::test_filter_string_array_with_null stdout ----
thread 'compute::kernels::filter::tests::test_filter_string_array_with_null' panicked at 'assertion failed: `(left == right)`
left: `true`,
right: `false`', arrow/src/compute/kernels/filter.rs:686:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
{code}
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