jiangzhx commented on code in PR #5468:
URL: https://github.com/apache/arrow-datafusion/pull/5468#discussion_r1125596047
##########
datafusion/core/src/dataframe.rs:
##########
@@ -344,24 +344,42 @@ impl DataFrame {
.collect::<Vec<_>>();
describe_schemas.insert(0, Field::new("describe", DataType::Utf8,
false));
+ //count aggregation
+ let cnt = self.clone().aggregate(
+ vec![],
+ original_schema_fields
+ .clone()
+ .map(|f| count(col(f.name())))
Review Comment:
**.map(|f| count(col(f.name())).alias(f.name())) not work, missing select
projection.**
```
ProjectionExec: expr=[7300 as COUNT(id), 7300 as COUNT(bool_col), 7300 as
COUNT(tinyint_col), 7300 as COUNT(smallint_col), 7300 as COUNT(int_col), 7300
as COUNT(bigint_col), 7300 as COUNT(float_col), 7300 as COUNT(double_col), 7300
as COUNT(date_string_col), 7300 as COUNT(string_col), 7300 as
COUNT(timestamp_col), 7300 as COUNT(year), 7300 as COUNT(month)]
EmptyExec: produce_one_row=true
```
| COUNT(id) | COUNT(bool_col) | COUNT(tinyint_col) | COUNT(smallint_col) |
COUNT(int_col) | COUNT(bigint_col) | COUNT(float_col) | COUNT(double_col) |
COUNT(date_string_col) | COUNT(string_col) | COUNT(timestamp_col) | COUNT(year)
| COUNT(month) |
|-----------|-----------------|--------------------|---------------------|----------------|-------------------|------------------|-------------------|------------------------|-------------------|----------------------|-------------|--------------|
| 7300 | 7300 | 7300 | 7300 |
7300 | 7300 | 7300 | 7300 |
7300 | 7300 | 7300 | 7300
| 7300 |
**.map(|f| count(col(f.name()))) work,aggregation with projection**
```
ProjectionExec: expr=[COUNT(?table?.id)@0 as id, COUNT(?table?.bool_col)@1
as bool_col, COUNT(?table?.tinyint_col)@2 as tinyint_col,
COUNT(?table?.smallint_col)@3 as smallint_col, COUNT(?table?.int_col)@4 as
int_col, COUNT(?table?.bigint_col)@5 as bigint_col, COUNT(?table?.float_col)@6
as float_col, COUNT(?table?.double_col)@7 as double_col,
COUNT(?table?.date_string_col)@8 as date_string_col,
COUNT(?table?.string_col)@9 as string_col, COUNT(?table?.timestamp_col)@10 as
timestamp_col, COUNT(?table?.year)@11 as year, COUNT(?table?.month)@12 as
month]
ProjectionExec: expr=[7300 as COUNT(id), 7300 as COUNT(bool_col),
7300 as COUNT(tinyint_col), 7300 as COUNT(smallint_col), 7300 as
COUNT(int_col), 7300 as COUNT(bigint_col), 7300 as COUNT(float_col), 7300 as
COUNT(double_col), 7300 as COUNT(date_string_col), 7300 as COUNT(string_col),
7300 as COUNT(timestamp_col), 7300 as COUNT(year), 7300 as COUNT(month)]
EmptyExec: produce_one_row=true
```
| id | bool_col | tinyint_col | smallint_col | int_col | bigint_col |
float_col | double_col | date_string_col | string_col | timestamp_col | year |
month |
|------|----------|-------------|--------------|---------|------------|-----------|------------|-----------------|------------|---------------|------|-------|
| 7300 | 7300 | 7300 | 7300 | 7300 | 7300 | 7300
| 7300 | 7300 | 7300 | 7300 | 7300 | 7300
|
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