alamb commented on a change in pull request #1209:
URL: https://github.com/apache/arrow-rs/pull/1209#discussion_r788025191
##########
File path: arrow/src/array/equal/mod.rs
##########
@@ -1297,4 +1297,38 @@ mod tests {
);
test_equal(&a, &b, false);
}
+
+ #[test]
+ fn test_non_null_empty_strings() {
+ let s = StringArray::from(vec![Some(""), Some(""), Some("")]);
+
+ let string1 = s.data();
+
+ let string2 = ArrayData::builder(DataType::Utf8)
+ .len(string1.len())
+ .buffers(string1.buffers().to_vec())
+ .build()
+ .unwrap();
+
+ // string2 is identical to string1 except that it has no validity
buffer but since there
+ // are no nulls, string1 and string2 are equal
+ test_equal(string1, &string2, true);
Review comment:
I verified that this test fails without the code change in this PR
```
---- array::equal::tests::test_non_null_empty_strings stdout ----
thread 'array::equal::tests::test_non_null_empty_strings' panicked at
'assertion failed: `(left == right)`
left: `false`,
right: `true`:
ArrayData { data_type: Utf8, len: 3, null_count: 0, offset: 0, buffers:
[Buffer { data: Bytes { ptr: 0x7fccacb04080, len: 16, data: [0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0] }, offset: 0 }, Buffer { data: Bytes { ptr: 0x80,
len: 0, data: [] }, offset: 0 }], child_data: [], null_bitmap: Some(Bitmap {
bits: Buffer { data: Bytes { ptr: 0x7fccacb04100, len: 1, data: [7] }, offset:
0 } }) }
ArrayData { data_type: Utf8, len: 3, null_count: 0, offset: 0, buffers:
[Buffer { data: Bytes { ptr: 0x7fccacb04080, len: 16, data: [0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0] }, offset: 0 }, Buffer { data: Bytes { ptr: 0x80,
len: 0, data: [] }, offset: 0 }], child_data: [], null_bitmap: None }',
arrow/src/array/equal/mod.rs:506:9
```
##########
File path: arrow/src/array/equal/variable_size.rs
##########
@@ -86,13 +86,13 @@ pub(super) fn variable_sized_equal<T: OffsetSizeTrait>(
let lhs_pos = lhs_start + i;
let rhs_pos = rhs_start + i;
- // the null bits can still be `None`, so we don't unwrap
+ // the null bits can still be `None`, indicating that the value is
valid.
Review comment:
this is so tricky. I had to read it several times to convince myself it
was correct (even with the great test case above @helgikrs ) 👍 thank you
##########
File path: arrow/src/array/equal/mod.rs
##########
@@ -1297,4 +1297,38 @@ mod tests {
);
test_equal(&a, &b, false);
}
+
+ #[test]
+ fn test_non_null_empty_strings() {
+ let s = StringArray::from(vec![Some(""), Some(""), Some("")]);
+
+ let string1 = s.data();
+
+ let string2 = ArrayData::builder(DataType::Utf8)
+ .len(string1.len())
+ .buffers(string1.buffers().to_vec())
+ .build()
+ .unwrap();
+
+ // string2 is identical to string1 except that it has no validity
buffer but since there
Review comment:
👍
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