alamb commented on a change in pull request #9211:
URL: https://github.com/apache/arrow/pull/9211#discussion_r558844335
##########
File path: rust/arrow/src/array/equal/mod.rs
##########
@@ -541,6 +541,15 @@ mod tests {
test_generic_binary_equal::<i64>()
}
+ #[test]
+ fn test_string_offset() {
+ let a = StringArray::from(vec![Some("a"), None, Some("b")]).data();
+ let a = a.slice(2, 1);
+ let b = StringArray::from(vec![Some("b")]).data();
+
+ test_equal(&a, b.as_ref(), true);
+ }
+
Review comment:
I may be missing something, but I tried a few more test cases and there
still seems to be something wrong.
Namely I would expect this test to pass:
```
#[test]
fn test_string_offset_larger() {
let a = StringArray::from(vec![Some("a"), None, Some("b"), None,
Some("c")]).data();
let b = StringArray::from(vec![None, Some("b"), None,
Some("c")]).data();
test_equal(&a.slice(2,2), &b.slice(0,2), false);
test_equal(&a.slice(2,2), &b.slice(1,2), true);
test_equal(&a.slice(2,2), &b.slice(2,2), false);
}
```
But instead if fails
```
---- array::equal::tests::test_string_offset_larger stdout ----
thread 'array::equal::tests::test_string_offset_larger' panicked at
'assertion failed: `(left == right)`
left: `false`,
right: `true`:
ArrayData { data_type: Utf8, len: 2, null_count: 1, offset: 2, buffers:
[Buffer { data: Bytes { ptr: 0x7fbc90504480, len: 24, data: [0, 0, 0, 0, 1, 0,
0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0] }, offset: 0 }, Buffer {
data: Bytes { ptr: 0x7fbc90504500, len: 3, data: [97, 98, 99] }, offset: 0 }],
child_data: [], null_bitmap: Some(Bitmap { bits: Buffer { data: Bytes { ptr:
0x7fbc90504580, len: 1, data: [21] }, offset: 0 } }) }
ArrayData { data_type: Utf8, len: 2, null_count: 1, offset: 1, buffers:
[Buffer { data: Bytes { ptr: 0x7fbc90604700, len: 20, data: [0, 0, 0, 0, 0, 0,
0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0] }, offset: 0 }, Buffer { data: Bytes
{ ptr: 0x7fbc90604880, len: 2, data: [98, 99] }, offset: 0 }], child_data: [],
null_bitmap: Some(Bitmap { bits: Buffer { data: Bytes { ptr: 0x7fbc90604780,
len: 1, data: [10] }, offset: 0 } }) }', arrow/src/array/equal/mod.rs:457:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
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