[GitHub] [arrow-datafusion] Arvamer opened a new issue, #2176: Ignored alias for columns with aggregate function and incorrect results when collecting statistics is enabled

[GitBox <gi...@apache.org>]

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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[GitHub] [arrow-datafusion] tustvold closed issue #2176: Ignored alias for columns with aggregate function and incorrect results when collecting statistics is enabled

[GitBox <gi...@apache.org>]

tustvold closed issue #2176: Ignored alias for columns with aggregate function and incorrect results when collecting statistics is enabled
URL: https://github.com/apache/arrow-datafusion/issues/2176


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