Question

我能够使用库（DBI）和库（RJDBC）从Hive成功连接和运行R中的查询

但是，我尝试设置以下配置

 Set hive.execution.engine=mr;

当我尝试使用以下命令时（我将查询它），我收到一个错误：

 dbGetQuery(conn_expp_team, "Set hive.execution.engine=mr")

这是错误：

 Error in .verify.JDBC.result(r, "Unable to retrieve JDBC result set for ",  : 
 Unable to retrieve JDBC result set for Set hive.execution.engine=mr (The query did not generate a result set!)

Answer 1

使用import numpy as np def calc_combination(N1, N2, n1, n2, theta, phi): N1 = N1[(N1 >= 0) & (N1 <= n1)] N2 = N2[(N2 >= 0) & (N2 <= n2)] a = N2 * theta + phi res = N1.reshape(N1.shape[0], 1) - a.reshape(1, a.shape[0]) indices = np.argwhere(res >= 0) pairs = zip(N1[indices[:,0]], N2[indices[:,1]]) return pairs def test_case(): n1 = 5 n2 = 1 theta = 2 phi = 2 N1 = np.arange(n1 + 1) N2 = np.arange(n2 + 1) assert (calc_combination(N1, N2, n1, n2, theta, phi) == [(2, 0), (3, 0), (4, 0), (4, 1), (5, 0), (5, 1)]) test_case()。资料来源：https://github.com/s-u/RJDBC/issues/25

使用Config在R中运行Hive查询

1 个答案: