from_unixtime 认为数据是字符串，其中数据在 hadoop 配置单元中是 int/bigint

Question

我的代码如下..

SELECT
        to_date(from_unixtime(time_first_touch)) AS sDate
    FROM (
SELECT
            MIN(GET_JSON_OBJECT(swanviraw.textcol,'$.ev_time')) as time_first_touch,
            COUNT(*) as number_of_events
        FROM swanviraw
    ) v

它抛出错误 - 编译语句时出错：失败：SemanticException [错误 10014]：行 2:10 错误参数 'time_first_touch'：class [=35= 没有匹配方法] 与（字符串）。可能的选择：FUNC(bigint) FUNC(bigint, string) FUNC(int) FUNC(int, string) [ERROR_STATUS]

现在，重点是以下查询工作正常。ev_time 具有 int/bigint 值，因为 MIN 在以下查询中完美运行..

 SELECT
                    MIN(GET_JSON_OBJECT(swanviraw.textcol,'$.ev_time')) as time_first_touch,
                    COUNT(*) as number_of_events
                FROM swanviraw

真诚感谢任何帮助..

谢谢

Answer 1

作为GET_JSON_OBJECT returns json string，并且由于错误指示from_unixtime期望int或bigint，您需要将time_first_touch转换为bigint:

SELECT
        to_date(from_unixtime(time_first_touch)) AS sDate
    FROM (
SELECT
            MIN(cast(GET_JSON_OBJECT(swanviraw.textcol,'$.ev_time') as bigint)) as time_first_touch,
            COUNT(*) as number_of_events
        FROM swanviraw
    ) as v

或

SELECT
        to_date(from_unixtime(time_first_touch)) AS sDate
    FROM (
SELECT
            MIN(unix_timestamp(GET_JSON_OBJECT(swanviraw.textcol,'$.ev_time'))) as time_first_touch,
            COUNT(*) as number_of_events
        FROM swanviraw
    ) as v

from_unixtime 认为数据是字符串，其中数据在 hadoop 配置单元中是 int/bigint

from_unixtime thinks data is string where data is int/bigint in hadoop hive

hadoop

hive

hiveql