Question

我正在使用HortonWorks Hadoop Sandbox并且我已经将jSON字符串导入到表中，但是this guide我遇到了麻烦，因为我的字符串包含一个数据处理不好的数组json_tuple（）。我尝试过expolode（）函数，但返回以下错误：

＆＃34;执行配置单元查询时出错：OK FAILED：UDFArgumentException explode（）将数组或地图作为参数＆＃34;

这究竟是什么意思，我该如何解决？问题是表格的格式吗？我按照上面的指南进行了跟踪，并创建了表格：

CREATE EXTERNAL TABLE games
(
    value STRING
)
LOCATION '/user/hue/games'

我试图爆炸的值是这样的数组：

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非常感谢任何帮助！

Answer 1

explode（）hive函数接受一个hive数组或映射，并给它一个String值。 json_tuple（）在指南中工作，因为它使你的字符串成为一个地图。

您需要将json数组转换为hive可以接受的格式，或者使用JSON SerDes之一或其他类似的内容来查询您想要的方式。

JSON SerDe for Hive that supports JSON arrays

将jSON数组导入Hive / Hadoop

1 个答案: