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https://issues.apache.org/jira/browse/CALCITE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16753270#comment-16753270
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Hongze Zhang edited comment on CALCITE-2791 at 1/27/19 4:15 AM:
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bq. I refer to the json function of mysql to add a set of available json 
functions to calcite.

Thanks for the explanition [~x1q1j1], I personally think the MySQL's JSON 
functions like JSON_TYPE can be very useful, they can do a lot more on JSON 
than standard's implementation. And if you are writing the MySQL's 
implementation, I can see maybe the multiple parameter syntax in PR ( 
[https://github.com/apache/calcite/pull/1013/files#diff-3969d844f7ecd2b3d324bf8b0e5a1e9aR5259])
 is more like a mistake, If so it is a detailed problem and not a big deal.


was (Author: zhztheplayer):
Thanks for the explanition [~x1q1j1], I personally think the MySQL's JSON 
functions like JSON_TYPE can be very useful, they can do a lot more on JSON 
than standard's implementation. And if you are writing the MySQL's 
implementation, I can see maybe the multiple parameter syntax in PR ( 
[https://github.com/apache/calcite/pull/1013/files#diff-3969d844f7ecd2b3d324bf8b0e5a1e9aR5259])
 is more like a mistake, If so it is a detailed problem and not a big deal.

> Add the JSON_TYPE function
> --------------------------
>
>                 Key: CALCITE-2791
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2791
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: xuqianjin
>            Assignee: Julian Hyde
>            Priority: Major
>              Labels: https://github.com/apache/calcite/pull/1013
>
> The data in json can be =, <, <=, >, >=, <>,! =, and <=>. But the data types 
> in json can be diverse, so when you compare different types, you have a 
> priority, and the high priority is greater than the low priority (you can 
> view the types with the JSON_TYPE() function). The priorities are as follows:
>  BOOLEAN
>  ARRAY
>  OBJECT
>  STRING
>  INTEGER
> LONG
> DOUBLE
>  NULL



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