我是 Apache Drill 的新手。我尝试将两个工作区中的文件放在一个视图中以查看便捷查询,但出现错误。
我尝试使用SQL语句构建视图,将两个工作区的数据整合到一个视图中,语句如下:
CREATE VIEW data_access.all_channels_view AS (
SELECT
columns[0] as channel_number,
columns[1] as stimestamp,
columns[2] as svalue,
'channel_0' as channel
FROM
data_access.channel_0.`*.txt`
UNION ALL
SELECT
columns[0] as channel_number,
columns[1] as stimestamp,
columns[2] as svalue,
'channel_1' as channel
FROM
data_access.channel_1.`*.txt`);
错误是:
Error: VALIDATION ERROR: Unable to create or drop objects. Schema [data_access] is immutable.
我保证我的所有工作区都设置为可写,如下:
{
"type": "file",
"connection": "file:///",
"workspaces": {
"channel_0": {
"location": "C:\\Users\\Admin\\Desktop\\DataFiles\\Channel_0",
"writable": true,
"defaultInputFormat": null,
"allowAccessOutsideWorkspace": true
},
"channel_1": {
"location": "C:\\Users\\Admin\\Desktop\\DataFiles\\Channel_1",
"writable": true,
"defaultInputFormat": null,
"allowAccessOutsideWorkspace": true
}
},
"formats": {
"json": {
"type": "json",
"extensions": [
"json"
]
},
"csv": {
"type": "text",
"extensions": [
"txt"
],
"lineDelimiter": "\n",
"fieldDelimiter": ",",
"quote": "\"",
"escape": "\"",
"comment": "#"
},
"parquet": {
"type": "parquet"
}
},
"authMode": "SHARED_USER",
"enabled": true
}
查了很多资料,但没有什么帮助。如果有人可以提供帮助,我将不胜感激。
试试这个 -
错误消息表明模式
是不可变的,这意味着您无法在此模式中创建或删除对象(如视图)。 查看您的工作区配置,我注意到您定义了工作区data_access
和channel_0
,但没有定义名为channel_1
的工作区或模式。 要解决此问题,您需要创建一个名为data_access
的可写工作区或架构。您可以通过向配置文件添加新工作区来完成此操作:data_access
在channel_1之后,将其添加到配置文件中
"data_access": {
"location": "C:\\Users\\Admin\\Desktop\\DataFiles\\DataAccess",
"writable": true,
"defaultInputFormat": null,
"allowAccessOutsideWorkspace": true
}