jorgecarleitao commented on a change in pull request #8546:
URL: https://github.com/apache/arrow/pull/8546#discussion_r513993661
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File path: rust/arrow/src/array/data.rs
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@@ -209,6 +209,61 @@ impl ArrayData {
}
}
+impl PartialEq for ArrayData {
+ fn eq(&self, other: &Self) -> bool {
+ assert_eq!(
+ self.data_type(),
+ other.data_type(),
+ "Data types not the same"
+ );
+ assert_eq!(self.len(), other.len(), "Lengths not the same");
+ // TODO: when adding tests for this, test that we can compare with
arrays that have offsets
+ assert_eq!(self.offset(), other.offset(), "Offsets not the same");
+ assert_eq!(self.null_count(), other.null_count());
+ // compare buffers excluding padding
+ let self_buffers = self.buffers();
+ let other_buffers = other.buffers();
+ assert_eq!(self_buffers.len(), other_buffers.len());
+ self_buffers.iter().zip(other_buffers).for_each(|(s, o)| {
+ compare_buffer_regions(
+ s,
+ self.offset(), // TODO mul by data length
+ o,
+ other.offset(), // TODO mul by data len
+ );
+ });
+ // assert_eq!(self.buffers(), other.buffers());
+
+ assert_eq!(self.child_data(), other.child_data());
+ // null arrays can skip the null bitmap, thus only compare if there
are no nulls
+ if self.null_count() != 0 || other.null_count() != 0 {
+ compare_buffer_regions(
+ self.null_buffer().unwrap(),
+ self.offset(),
+ other.null_buffer().unwrap(),
+ other.offset(),
+ )
+ }
Review comment:
I see. I would have written an utility function just for that, or use
`debug_assert_eq`, so that the in release we do not assert those.
My main concern is that `ArrayData` is public API, which means that users
can now use `array_data1 == array_data2`. That now panics when the two data is
not equal (under some definition of equal), which was my only concern.
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