tustvold commented on code in PR #1560:
URL: https://github.com/apache/arrow-rs/pull/1560#discussion_r849553157
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parquet/src/arrow/array_reader/empty_array.rs:
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@@ -0,0 +1,58 @@
+use crate::arrow::array_reader::ArrayReader;
+use crate::errors::Result;
+use arrow::array::{ArrayDataBuilder, ArrayRef, StructArray};
+use arrow::datatypes::DataType as ArrowType;
+use std::any::Any;
+use std::sync::Arc;
+
+/// Returns an [`ArrayReader`] that yields [`StructArray`] with no columns
+/// but with row counts that correspond to the amount of data in the file
+///
+/// This is useful for when projection eliminates all columns within a
collection
+pub fn make_empty_array_reader(row_count: usize) -> Box<dyn ArrayReader> {
Review Comment:
I don't like this name, but it was the best I could come up with
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