Method createStep

src/Processors/QueryPlan/QueryPlanStepRegistry.cpp:26–38

}

QueryPlanStepPtr QueryPlanStepRegistry::createStep(
    const std::string & name,
    IQueryPlanStep::Deserialization & ctx) const
{
    StepCreateFunction create_function;
    {
        auto it = steps.find(name);
        if (it == steps.end())
            throw Exception(ErrorCodes::UNKNOWN_IDENTIFIER, "Unknown query plan step: {}", name);
        create_function = it->second;
    }
    return create_function(ctx);
}

void registerExpressionStep(QueryPlanStepRegistry & registry);
void registerUnionStep(QueryPlanStepRegistry & registry);