add aggThrow function to docs

docs/en/sql-reference/aggregate-functions/reference/aggthrow.md

@@ -0,0 +1,37 @@
+---
+slug: /en/sql-reference/aggregate-functions/reference/aggthrow
+sidebar_position: 101
+---
+
+# aggThrow
+
+This function can be used for the purpose of testing exception safety. It will throw an exception on creation with the specified probability.
+
+**Syntax**
+
+```sql
+aggThrow(throw_prob)
+```
+
+**Arguments**
+
+- `throw_prob` — Probability to throw on creation. [Float64](../../data-types/float.md).
+
+**Returned value**
+
+- An exception: `Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully`.
+
+**Example**
+
+Query:
+
+```sql
+SELECT number % 2 AS even, aggThrow(number) FROM numbers(10) GROUP BY even;
+```
+
+Result:
+
+```response
+Received exception:
+Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully: While executing AggregatingTransform. (AGGREGATE_FUNCTION_THROW)
+```

docs/en/sql-reference/aggregate-functions/reference/index.md

@@ -43,6 +43,7 @@ Standard aggregate functions:
 
 ClickHouse-specific aggregate functions:
 
+- [aggThrow](../reference/aggthrow.md)
 - [analysisOfVariance](../reference/analysis_of_variance.md)
 - [any](../reference/any_respect_nulls.md)
 - [anyHeavy](../reference/anyheavy.md)