alamb commented on code in PR #5875:
URL: https://github.com/apache/arrow-rs/pull/5875#discussion_r1641314456
##########
parquet/src/arrow/arrow_writer/mod.rs:
##########
@@ -107,6 +107,20 @@ mod levels;
/// }
/// ```
///
+/// ## Type Support
+///
+/// The writer supports writing all Arrow [`DataType`]s that have a direct
mapping to
+/// Parquet types including [`StructArray`] and [`ListArray`].
+///
+/// The following are not supported:
+///
+/// * [`IntervalMonthDayNanoArray`]: Parquet does not [support nanosecond
intervals].
+///
Review Comment:
I double checked and it seems like Date64 can be written:
```sql
andrewlamb@Andrews-MacBook-Pro-2:~/Software/arrow-rs$ datafusion-cli -c
'select c1, arrow_typeof(c1) from "/tmp/test.parquet"'
DataFusion CLI v39.0.0
+---------------------+------------------------------------+
| c1 | arrow_typeof(/tmp/test.parquet.c1) |
+---------------------+------------------------------------+
| 1970-01-01T00:00:00 | Date64 |
| 1970-01-01T00:00:00 | Date64 |
+---------------------+------------------------------------+
2 row(s) fetched.
Elapsed 0.005 seconds.
```
```rust
fn main() {
let input_array = Date64Array::from(vec![123, 456]);
let batch = RecordBatch::try_from_iter(
vec![("c1", Arc::new(input_array) as _)]
).unwrap();
println!("Input array: {}",
pretty_format_batches(&[batch.clone()]).unwrap());
if let Err(e) = std::fs::remove_file("/tmp/test.parquet") {
println!("can't remove file: {e:?}");
}
// round trip to parquet
let f = File::create_new("/tmp/test.parquet").unwrap();
let schema = batch.schema();
let props = None;
let mut writer = ArrowWriter::try_new(f, schema, props).unwrap();
writer.write(&batch).unwrap();
writer.flush().unwrap();
writer.close();
}
```
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