Dandandan commented on a change in pull request #1339:
URL: https://github.com/apache/arrow-rs/pull/1339#discussion_r822867367
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File path: arrow/src/ipc/reader.rs
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@@ -845,11 +888,23 @@ impl<R: Read> StreamReader<R> {
// Create an array of optional dictionary value arrays, one per field.
let dictionaries_by_field = vec![None; schema.fields().len()];
+ let projection = projection.map(|projection| {
+ let fields = projection
+ .iter()
+ .map(|x| schema.fields[*x].clone())
+ .collect();
+ let schema = Schema {
+ fields,
+ metadata: schema.metadata.clone(),
+ };
+ (projection, schema)
+ });
Review comment:
Thanks, did it a bit different.
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