msalib commented on issue #1932:
URL: https://github.com/apache/arrow-rs/issues/1932#issuecomment-1165079359
This slightly simplified example shows different behavior when depending on
`arrow=14.0.0,parquet=14.0.0` versus `arrow=15.0.0,parquet=15.0.0`. The
difference is visible both from `pandas` and `pqrs schema`.
```rust
use std::sync::Arc;
use arrow::{
array::{StringArray, TimestampMillisecondArray},
datatypes::{DataType, Field, Schema, TimeUnit},
record_batch::RecordBatch,
};
use parquet::arrow::arrow_writer::ArrowWriter;
fn main() {
let tz = Some("UTC".to_owned());
let fields = vec![
Field::new(
"metric_date",
DataType::Timestamp(TimeUnit::Millisecond, tz.clone()),
false,
),
Field::new("my_id", DataType::Utf8, false),
];
let schema = Arc::new(Schema::new(fields));
let my_ids = Arc::new(StringArray::from(vec!["hi", "there"]));
let dates = Arc::new(TimestampMillisecondArray::from_vec(
vec![1234532523, 1234124],
tz,
));
let batch = RecordBatch::try_new(schema.clone(), vec![dates,
my_ids]).unwrap();
let f = std::fs::File::create("/tmp/q.parquet").unwrap();
let mut writer = ArrowWriter::try_new(f, schema, None).unwrap();
writer.write(&batch).unwrap();
writer.close().unwrap();
println!("Hello, world!");
}
```
Given the unfortunate state of the specification, I understand that the
changes in version 15 might be better in many ways and fix all manner of
issues, but in this regard, they constitute a regression.
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