Hive中的嵌套案例声明

Question

有谁知道为什么此代码不起作用？

create table2 as
select
    *,
    1 as count,
    case
        when a=1 then
            case 
                when tx="A_L" then "L"
                when tx="B_A" then "A"
                when tx="C_E" then "E"
                when tx in ("E_V","D_M","H_O","I_D") then "Other"
                when tx="F_S" then "S"
                when tx="G_L" then "L"
            end 
        when b=1 then 
            case
                when tx="A_L" then "L"
                when tx="B_A" then "A"
                when tx="C_E" then "E"
            end
        else
            case
                when tx="A_L" then "L"
                when tx="B_A" then "A"
                when tx="C_E" then "E"
                when tx in ("D_M","E_V","F_S","H_O","I_D") then "Other"
                when tx="G_L" then "L"
            end
    end as tx1
from table1

还是有一个更简单的方法来做到这一点？我正在proc sql语句中编写此代码，并将其推送到Hadoop（因此它必须与HiveQL兼容）。

Answer 1

使用AND或OR子句将嵌套的Case语句合并为一个case语句。