Joseph-Rance commented on code in PR #4773:
URL: https://github.com/apache/arrow-rs/pull/4773#discussion_r1342585425
##########
parquet_derive/README.md:
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@@ -77,16 +77,55 @@ writer.close_row_group(row_group).unwrap();
writer.close().unwrap();
```
+Example usage of deriving a `RecordReader` for your struct:
+
+```rust
+use parquet::file::{serialized_reader::SerializedFileReader,
reader::FileReader};
+use parquet_derive::ParquetRecordReader;
+
+#[derive(ParquetRecordReader)]
+struct ACompleteRecord {
+ pub a_bool: bool,
+ pub a_string: String,
+ pub i16: i16,
+ pub i32: i32,
+ pub u64: u64,
+ pub isize: isize,
+ pub float: f32,
+ pub double: f64,
+ pub now: chrono::NaiveDateTime,
+ pub byte_vec: Vec<u8>,
+}
+
+// Initialize your parquet file
+let reader = SerializedFileReader::new(file).unwrap();
+let mut row_group = reader.get_row_group(0).unwrap();
+
+// create your records to read into
+let mut chunks = vec![ACompleteRecord{ ... }];
Review Comment:
Yes but we are immediately writing that into the struct so we aren't
necessarily holding all of these slices in memory at once. To be honest, such a
minor performance consideration isn't realistically going to be an issue, so
I'll try to make this change.
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