[GitHub] [arrow-datafusion] pjmore commented on a change in pull request #2000: Fixed parquet path partitioning when only selecting partitioned columns

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

pjmore commented on a change in pull request #2000:
URL: https://github.com/apache/arrow-datafusion/pull/2000#discussion_r841259199



##########
File path: datafusion/tests/path_partition.rs
##########
@@ -40,6 +40,63 @@ use datafusion::{
 };
 use futures::{stream, StreamExt};
 
+#[tokio::test]
+async fn parquet_distinct_partition_col() -> Result<()> {
+    let mut ctx = SessionContext::new();
+
+    register_partitioned_alltypes_parquet(
+        &mut ctx,
+        &[
+            "year=2021/month=09/day=09/file.parquet",
+            "year=2021/month=10/day=09/file.parquet",
+            "year=2021/month=10/day=28/file.parquet",
+        ],
+        &["year", "month", "day"],
+        "",
+        "alltypes_plain.parquet",
+    )
+    .await;
+
+    let result = ctx
+        .sql("SELECT distinct year,month,day FROM t")
+        .await?
+        .collect()
+        .await?;
+
+    let expected = vec![
+        "+------+-------+-----+",
+        "| year | month | day |",
+        "+------+-------+-----+",
+        "| 2021 | 09    | 09  |",
+        "| 2021 | 10    | 09  |",
+        "| 2021 | 10    | 28  |",
+        "+------+-------+-----+",
+    ];
+    assert_batches_sorted_eq!(expected, &result);
+
+    let actual_row_count: usize = ctx
+        .sql("SELECT id from t")
+        .await?
+        .collect()
+        .await?
+        .into_iter()
+        .map(|batch| batch.num_rows())
+        .sum();
+
+    let partition_row_count: usize = ctx

Review comment:
       I've added some tests for this in the most recent commit.




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