tustvold commented on a change in pull request #7076:
URL: https://github.com/apache/arrow/pull/7076#discussion_r418650048
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File path: rust/arrow/src/array/builder.rs
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@@ -527,11 +527,18 @@ pub struct ListBuilder<T: ArrayBuilder> {
impl<T: ArrayBuilder> ListBuilder<T> {
/// Creates a new `ListArrayBuilder` from a given values array builder
pub fn new(values_builder: T) -> Self {
- let mut offsets_builder = Int32BufferBuilder::new(values_builder.len()
+ 1);
+ let capacity = values_builder.len();
+ Self::with_capacity(values_builder, capacity)
+ }
+
+ /// Creates a new `ListArrayBuilder` from a given values array builder
+ /// `append` may be called up to `capacity` times without triggering
reallocation
Review comment:
I went with something I hope was in the spirit of what you wanted, as
technically it allocates for an extra offset and also pre-allocates the bitmap
builder. Let me know if you'd prefer I stuck with your exact wording
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