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https://issues.apache.org/jira/browse/CALCITE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16768688#comment-16768688
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Julian Hyde commented on CALCITE-2791:
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Does the SQL work? I didn't test it.
> 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: Forward Xu
> Assignee: Julian Hyde
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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,INTEGE,DOUBLE,NULL
> Example Data:
> {"a":[10,true]}
> SELECT JSON_TYPE(v) AS c1,
> JSON_TYPE(v.a) AS c2,
> JSON_TYPE(v.a[0]) AS c3,
> JSON_TYPE(v.a[1]) AS c4
> FROM VALUES ('
> {"a": [10, true]}
> ') AS t(v);
> c1 c2 c3 c4
> ======= ======= ======= =======
> OBJECT ARRAY INTEGER BOOLEAN
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