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EdgeX event tags metadata can not be accessed by -> operator #3750

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@younes199511

Description

@younes199511

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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