Merge pull request #10708 from b41sh/feat-list-func

feat(function): Add `list` Aggregate function

Author: BohuTANG

docs/doc/15-sql-functions/10-aggregate-functions/aggregate-list.md

@@ -0,0 +1,34 @@
+---
+title: LIST
+---
+
+Aggregate function.
+
+The LIST() function converts all the values of a column to an Array.
+
+## Syntax
+
+```sql
+LIST(expression)
+```
+
+## Arguments
+
+| Arguments   | Description    |
+| ----------- | -------------- |
+| expression  | Any expression |
+
+## Return Type
+
+the Array type that use the type of the value as inner type.
+
+## Examples
+
+```sql
+SELECT LIST(number) FROM numbers(10);
++-----------------------+
+| list(number)          |
++-----------------------+
+| [0,1,2,3,4,5,6,7,8,9] |
++-----------------------+
+```

docs/doc/15-sql-functions/10-aggregate-functions/index.md

@@ -30,4 +30,5 @@ These functions help you extract and summarize data from databases to gain valua
 | [QUANTILE](aggregate-quantile.md)                           | Calculates the quantile for a specific column               | 
 | [RETENTION](aggregate-retention.md)                         | Calculates retention for a set of events                    | 
 | [WINDOW_FUNNEL](aggregate-windowfunnel.md)                  | Analyzes user behavior in a time-ordered sequence of events | 
+| [LIST](aggregate-list.md)                                   | Converts all the values of a column to an Array             |
 

src/query/functions/src/aggregates/aggregate_function_factory.rs

@@ -157,6 +157,12 @@ impl AggregateFunctionFactory {
     ) -> Result<AggregateFunctionRef> {
         let name = name.as_ref();
         let mut features = AggregateFunctionFeatures::default();
+        // The NULL value in the list function needs to be added to the returned array column,
+        // so handled separately.
+        if name == "list" {
+            let agg = self.get_impl(name, params, arguments, &mut features)?;
+            return Ok(agg);
+        }
 
         if !arguments.is_empty() && arguments.iter().any(|f| f.is_nullable_or_null()) {
             let new_params = AggregateFunctionCombinatorNull::transform_params(&params)?;