GitHub user tomsun28 added a comment to the discussion: Use ANTLR DSL to parse 
expression

hi, when switch sql query, the datasource maybe also gretimedb, beacuse it 
support sql query. If convert sql to promql, i think it's difficult and error 
prone.  In the future, the usage scenario may be that the query for metrics 
data may be promql, and the query for log data may be sql. Both of these are 
supported in greptimedb.
2. Are there any other products with similar functions(support multiple 
language query)? This is not clear, maybe not.

GitHub link: 
https://github.com/apache/hertzbeat/discussions/3205#discussioncomment-12868270

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