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

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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

aggThrow(throw_prob)

Arguments

• throw_prob — Probability to throw on creation. Float64.

Returned value

• An exception: Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully.

Example

Query:

SELECT number % 2 AS even, aggThrow(number) FROM numbers(10) GROUP BY even;

Result:

Received exception:
Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully: While executing AggregatingTransform. (AGGREGATE_FUNCTION_THROW)