silathdiir commented on a change in pull request #537:
URL: https://github.com/apache/arrow-rs/pull/537#discussion_r667422194
##########
File path: arrow/src/record_batch.rs
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@@ -353,6 +354,35 @@ impl RecordBatch {
let schema = Arc::new(Schema::new(fields));
RecordBatch::try_new(schema, columns)
}
+
+ /// Concatenates `batches` together into a single record batch.
+ pub fn concat(schema: &SchemaRef, batches: &[Self]) -> Result<Self> {
+ if batches.is_empty() {
+ return Ok(RecordBatch::new_empty(schema.clone()));
+ }
+ let field_num = schema.fields().len();
+ if let Some((i, _)) = batches
+ .iter()
+ .enumerate()
+ .find(|&(_, batch)| batch.num_columns() < field_num)
Review comment:
I could not confirm if a batch of more columns than schema could be
allowed to be concatenated, as below test case
[concat_record_batches_of_similar_schemas](https://github.com/apache/arrow-rs/pull/537/files#diff-9841f61221a67c626eb60a49f2aeb7de6c1a16ab478bc7cb2675f5807b32b8e6R700).
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