chingren-ooi commented on issue #10231:
URL: https://github.com/apache/datafusion/issues/10231#issuecomment-2078600222
Hey, I've successfully obtained the correct output following your advice.
Can we expect any update or fix to the current `describe()` functionality?
```
use datafusion::logical_expr::aggregate_function;
use datafusion::logical_expr::expr::AggregateFunction;
```
```
fn count_null(expr: Expr) -> Expr {
Expr::AggregateFunction(AggregateFunction::new(
aggregate_function::AggregateFunction::Count,
vec![expr.clone()],
false,
Some(Box::new(expr.is_null())),
None,
None,
))
}
```
```
// null_count aggregation
df.clone().aggregate(
vec![],
original_schema_fields
.clone()
.filter(|f| f.data_type().is_numeric())
.map(|f| count_null(is_null(col(f.name()))).alias(f.name()))
.collect::<Vec<_>>(),
),
```
```
+----------------+------+-------------------+------+
| describe | car | speed | time |
+----------------+------+-------------------+------+
| count | null | 25.0 | null |
| null_count | null | 0.0 | null |
| mean | null | 11.84 | null |
| std | null | 6.456456716600317 | null |
| min | null | 0.0 | null |
| max | null | 21.5 | null |
| median | null | 11.0 | null |
+----------------+------+-------------------+------+
```
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