Method getFunctionEvaluator

src/processor/map/expression_mapper.cpp:145–162

}

std::unique_ptr<ExpressionEvaluator> ExpressionMapper::getFunctionEvaluator(
    std::shared_ptr<Expression> expression) {
    evaluator_vector_t childrenEvaluators;
    if (expression->getNumChildren() == 2 &&
        expression->getChild(1)->expressionType == ExpressionType::LAMBDA) {
        childrenEvaluators.push_back(getEvaluator(expression->getChild(0)));
        auto result =
            std::make_unique<ListLambdaEvaluator>(expression, std::move(childrenEvaluators));
        auto recursiveExprMapper = ExpressionMapper(schema, result.get());
        auto& lambdaExpr = expression->getChild(1)->constCast<LambdaExpression>();
        result->setLambdaRootEvaluator(
            recursiveExprMapper.getEvaluator(lambdaExpr.getFunctionExpr()));
        return result;
    }
    childrenEvaluators = getEvaluators(expression->getChildren());
    return std::make_unique<FunctionExpressionEvaluator>(std::move(expression),
        std::move(childrenEvaluators));
}

std::unique_ptr<ExpressionEvaluator> ExpressionMapper::getNodeEvaluator(
    std::shared_ptr<Expression> expression) {