tustvold commented on code in PR #3954:
URL: https://github.com/apache/arrow-rs/pull/3954#discussion_r1148590705
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arrow-array/src/builder/generic_list_builder.rs:
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@@ -125,11 +125,97 @@ where
/// Panics if the length of [`Self::values`] exceeds `OffsetSize::MAX`
#[inline]
pub fn append(&mut self, is_valid: bool) {
- self.offsets_builder
-
.append(OffsetSize::from_usize(self.values_builder.len()).unwrap());
+ self.offsets_builder.append(self.next_offset());
self.null_buffer_builder.append(is_valid);
}
+ /// Returns the next offset
+ ///
+ /// # Panics
+ ///
+ /// Panics if the length of [`Self::values`] exceeds `OffsetSize::MAX`
+ #[inline]
+ fn next_offset(&self) -> OffsetSize {
+ OffsetSize::from_usize(self.values_builder.len()).unwrap()
+ }
+
+ /// Append a value to this [`GenericListBuilder`]
+ ///
+ /// ```
+ /// # use arrow_array::builder::{Int32Builder, ListBuilder};
+ /// # use arrow_array::cast::AsArray;
+ /// # use arrow_array::{Array, Int32Array};
+ /// # use arrow_array::types::Int32Type;
+ /// let mut builder = ListBuilder::new(Int32Builder::new());
+ ///
+ /// builder.append_value([Some(1), Some(2), Some(3)]);
Review Comment:
I think this is much easier to read than the current API
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