Skip to main content
Edit this page

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)