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https://issues.apache.org/jira/browse/CALCITE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16771575#comment-16771575
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Hongze Zhang edited comment on CALCITE-2791 at 2/19/19 5:15 AM:
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[~x1q1j1], Did you intent to use values('\{"a": [10, true]}')? The picture you
put above shows what you tested is values('\{"a": "[10, true]"}').
You can use strict syntax of JSON_VALUE to see the error message. E.g.
{code:java}
SELECT JSON_VALUE(v, 'strict $.a[0]' ERROR ON ERROR)
FROM (VALUES ('{"a": "[10, true]"}')) AS t(v);
{code}
It will give you something like
{code:java}
Filter: [0] can only be applied to arrays. Current context is: [10, true]
{code}
was (Author: zhztheplayer):
[~x1q1j1], Did you intent to use values('{"a": [10, true]}')? The picture you
put above shows what you tested is values('{"a": "[10, true]"}').
You can use strict syntax of JSON_VALUE to see the error message. E.g.
{code:java}
SELECT JSON_VALUE(v, 'strict $.a[0]' ERROR ON ERROR)
FROM (VALUES ('{"a": "[10, true]"}')) AS t(v);
{code}
It will give you something like
{code:java}
Filter: [0] can only be applied to arrays. Current context is: [10, true]
{code}
> 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
> Attachments: image-2019-02-19-12-24-10-200.png
>
> Time Spent: 0.5h
> 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(a) AS c2,
> JSON_TYPE(b) AS c3,
> JSON_TYPE(c) AS c4 FROM (VALUES ('\{"a": [10, true]}','[10, true]', '10',
> 'true')) AS t(v, a, b, c)
> limit 10;
> c1 c2 c3 c4
> ======= ======= ======= =======
> OBJECT ARRAY INTEGER BOOLEAN
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