Hive 配置单元中的布尔列加载为NULL

我有以下输入csv文件

10418872, fever, FALSE
10418872, shortness of breath, FALSE
10418872, shortness of breath, FALSE
10418872, shortness of breath, FALSE

我使用这些命令创建了一个配置单元表，并在其中加载了数据

create database bpo;
CREATE EXTERNAL TABLE bpo.adverse(patientId INT, symptom STRING, severe BOOLEAN) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' STORED AS TEXTFILE LOCATION '/landingzone/hive/adverse';
LOAD DATA INPATH '/landingzone/adverse-effects.csv' INTO TABLE bpo.adverse;

但是现在当我查询配置单元中的数据时

10418872         fever  NULL
10418872         shortness of breath    NULL
10418872         shortness of breath    NULL
10418872         shortness of breath    NULL

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为什么布尔列变为空？我也尝试过改变大小写。

请在FALSE之前修剪前导空格并重试

我对上述输入进行了如下测试，您可以看到输出中的差异：

10418872, fever,FALSE
10418872, shortness of breath,FALSE
10418872, shortness of breath, FALSE
10418872, shortness of breath, FALSE

我在hive中得到的结果如下：

adverse.patientid  adverse.symptom  adverse.severe
10418872         fever  false
10418872         shortness of breath    false
10418872         shortness of breath    NULL
10418872         shortness of breath    NULL