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Posted to issues@calcite.apache.org by "Forward Xu (JIRA)" <ji...@apache.org> on 2019/03/01 03:42:00 UTC
[jira] [Reopened] (CALCITE-2791) Add the JSON_TYPE function
[ https://issues.apache.org/jira/browse/CALCITE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Forward Xu reopened CALCITE-2791:
---------------------------------
> Add the JSON_TYPE function
> --------------------------
>
> Key: CALCITE-2791
> URL: https://issues.apache.org/jira/browse/CALCITE-2791
> Project: Calcite
> Issue Type: Sub-task
> Components: core
> Reporter: Forward Xu
> Assignee: Forward Xu
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2019-02-19-12-24-10-200.png
>
> Time Spent: 3h 20m
> 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 Sql::
> {"a":[10,true]}
> SELECT JSON_TYPE(v) AS c1
> ,JSON_TYPE(JSON_VALUE(v, 'lax $.b' ERROR ON ERROR)) AS c2
> ,JSON_TYPE(JSON_VALUE(v, 'strict $.a[0]' ERROR ON ERROR)) AS c3
> ,JSON_TYPE(JSON_VALUE(v, 'strict $.a[1]' ERROR ON ERROR)) AS c4
> FROM (VALUES ('{"a": [10, true],"b": "[10, true]"}')) AS t(v)
> limit 10;
> Result:
> c1 c2 c3 c4
> ======= ======= ======= =======
> OBJECT ARRAY INTEGER BOOLEAN
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