Function parallel_query

test/api/api_test.cpp:35–39

The following two tests are disabled in single-threaded mode because they require multiple threads to run.

// The following two tests are disabled in single-threaded mode because they
// require multiple threads to run.
static void parallel_query(Connection* conn) {
    for (auto i = 0u; i < 100; ++i) {
        assertMatchPersonCountStar(conn);
    }
}

TEST_F(ApiTest, ParallelQuerySingleConnect) {
    const auto numThreads = 20u;