Arvamer opened a new issue, #2176:
URL: https://github.com/apache/arrow-datafusion/issues/2176
**Describe the bug**
For parquet files, when `collect_stat` is set to `true`, alias for columns
with aggregate function is ignored and for some data types null is returned.
Current master (f0200b0a963bb817a6dad96a0b1fe0d06576004b).
**To Reproduce**
```rust
use std::{sync::Arc, thread};
use anyhow::Result;
use datafusion::{
datasource::{
file_format::parquet::{ParquetFormat, DEFAULT_PARQUET_EXTENSION},
listing::ListingOptions,
},
logical_plan::{col, max},
prelude::SessionContext,
};
#[tokio::main]
async fn main() -> Result<()> {
tracing_subscriber::fmt::init();
let threads = thread::available_parallelism()?.get();
let options = ListingOptions {
file_extension: DEFAULT_PARQUET_EXTENSION.to_owned(),
format: Arc::new(ParquetFormat::default()),
table_partition_cols: vec![],
collect_stat: false,
target_partitions: threads,
};
let path = "data.parquet";
let ctx = SessionContext::new();
ctx.register_listing_table("data", path, options, None)
.await?;
let data = ctx.table("data")?;
data.show().await?;
data.aggregate(vec![], vec![max(col("day")).alias("max_day")])?
.show()
.await?;
data.aggregate(vec![], vec![max(col("txt")).alias("max_txt")])?
.show()
.await?;
data.aggregate(vec![], vec![max(col("int")).alias("max_int")])?
.show()
.await?;
Ok(())
}
```
```
+------------+-----+-----+
| day | txt | int |
+------------+-----+-----+
| 2022-01-02 | abc | 11 |
| 2022-01-03 | abb | 10 |
| 2022-01-01 | bbb | 12 |
+------------+-----+-----+
+----------+
| MAX(day) |
+----------+
| |
+----------+
+----------+
| MAX(txt) |
+----------+
| |
+----------+
+----------+
| MAX(int) |
+----------+
| 12 |
+----------+
```
**Expected behavior**
Queries should return:
```
+------------+
| max_day |
+------------+
| 2022-01-03 |
+------------+
+---------+
| max_txt |
+---------+
| bbb |
+---------+
+---------+
| max_int |
+---------+
| 12 |
+---------+
```
[reproduction.zip](https://github.com/apache/arrow-datafusion/files/8441367/reproduction.zip)
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