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Description
Environment:
- eKuiper version : 2.1.0
What happened and what you expected to happen:
EdgeX event tags metadata can not be accessed by -> operator. meta(tags)->tagName
should work as tags is an object (map[string]any)
How to reproduce it (as minimally and precisely as possible):
select meta(tags)->tagName from demo
Anything else we need to know?:
The work around that i found is: parse_json(to_json(meta(tags)))->tagName
but it impacts processing time
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