Boulea7 commented on code in PR #10611:
URL: https://github.com/apache/arrow-rs/pull/10611#discussion_r3755386511
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arrow-csv/src/reader/mod.rs:
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@@ -520,6 +520,18 @@ where
}
impl<R> BufReader<R> {
+ fn projected_schema(&self) -> SchemaRef {
+ match &self.decoder.projection {
+ Some(projection) => Arc::new(
+ self.decoder
+ .schema
+ .project(projection)
+ .expect("invalid CSV projection"),
Review Comment:
Good question — there was no earlier validation. Previously, an out-of-range
index could panic either in `Reader::schema()` or while parsing the first
batch; now `ReaderBuilder::build` returns a `SchemaError`, while the push
decoder returns the same error from `flush` once input is buffered. Regression
tests cover both paths.
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