[jira] [Commented] (ARROW-12312) [Rust][DataFusion] COUNT DISTINCT does not support for `Float64`

["Andrew Lamb (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-12312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332406#comment-17332406 ] 

Andrew Lamb commented on ARROW-12312:
-------------------------------------

Migrated to github: https://github.com/apache/arrow-datafusion/issues/199

> [Rust][DataFusion] COUNT DISTINCT does not support for `Float64`
> ----------------------------------------------------------------
>
>                 Key: ARROW-12312
>                 URL: https://issues.apache.org/jira/browse/ARROW-12312
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust - DataFusion
>            Reporter: Andrew Lamb
>            Priority: Major
>
> If you try to run a `COUNT (DISTINCT ..)` query on a float column you get the following error:
> thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list', datafusion/src/scalar.rs:342:22
> Reproducer:
> {code}
>  echo "foo,1.23" > /tmp/foo.csv
>  ./target/debug/datafusion-cli
> > CREATE EXTERNAL TABLE t (a varchar, b float) STORED AS CSV LOCATION '/tmp/foo.csv';
> 0 rows in set. Query took 0 seconds.
> > select count(distinct a) from t;
> +-------------------+
> | COUNT(DISTINCT a) |
> +-------------------+
> | 1                 |
> +-------------------+
> 1 rows in set. Query took 0 seconds.
> > select count(distinct b) from t;
> thread 'tokio-runtime-worker' panicked at 'Unexpected DataType for list', datafusion/src/scalar.rs:342:22
> note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
> ArrowError(ExternalError(Canceled))
> {code}



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