nevi-me commented on a change in pull request #7365:
URL: https://github.com/apache/arrow/pull/7365#discussion_r436257140
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File path: rust/arrow/src/array/builder.rs
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@@ -1018,6 +1271,50 @@ impl ArrayBuilder for StructBuilder {
self.len
}
+ /// Appends data from other arrays into the builder
+ ///
+ /// This is most useful when concatenating arrays of the same type into a
builder.
+ fn append_data(&mut self, data: &[ArrayDataRef]) -> Result<()> {
+ for array in data {
+ if let DataType::Struct(fields) = array.data_type() {
+ if &self.fields != fields {
+ return Err(ArrowError::InvalidArgumentError(
+ "Struct arrays are not the same".to_string(),
+ ));
+ }
+ let len = array.len();
+ if len == 0 {
+ continue;
+ }
+ let offset = array.offset();
+ let results: Result<Vec<()>> = self
+ .field_builders
+ .iter_mut()
+ .zip(array.child_data())
+ .map(|(builder, child_data)| {
+ // slice child_data to account for offsets
+ let child_array = make_array(child_data.clone());
+ let sliced = child_array.slice(offset, len);
+ builder.append_data(&[sliced.data()])
+ })
+ .collect();
+ results?;
Review comment:
Thanks, I've changed it
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