Method ArrayJoinStep

src/Interpreters/ExpressionActions.cpp:1048–1065

}

ExpressionActionsChain::ArrayJoinStep::ArrayJoinStep(ArrayJoinActionPtr array_join_, ColumnsWithTypeAndName required_columns_)
    : Step({})
    , array_join(std::move(array_join_))
    , result_columns(std::move(required_columns_))
{
    for (auto & column : result_columns)
    {
        required_columns.emplace_back(NameAndTypePair(column.name, column.type));

        if (array_join->columns.count(column.name) > 0)
        {
            const auto array_type = getArrayJoinDataType(column.type);
            column.type = array_type->getNestedType();
            /// Arrays are materialized
            column.column = nullptr;
        }
    }
}

void ExpressionActionsChain::ArrayJoinStep::finalize(const NameSet & required_output_)
{