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https://issues.apache.org/jira/browse/CALCITE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773591#comment-16773591
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Forward Xu commented on CALCITE-2791:
-------------------------------------
hi [~zhztheplayer] Thank you very much.I hope to get your help from the test
example I wrote.
{code:java}
// code placeholder
CalciteAssert.that()
.query("SELECT JSON_TYPE(v) AS c1\n"
+ ",JSON_TYPE(JSON_VALUE(v, 'lax $.b' ERROR ON ERROR)) AS c2\n"
+ ",JSON_TYPE(JSON_VALUE(v, 'strict $.a[0]' ERROR ON ERROR)) AS c3\n"
+ ",JSON_TYPE(JSON_VALUE(v, 'strict $.a[1]' ERROR ON ERROR)) AS c4\n"
+ "FROM (VALUES ('{\"a\": [10, true],\"b\": \"[10, true]\"}')) AS
t(v)\n"
+ "limit 10")
.returns("C1=OBJECT; C2=ARRAY; C3=INTEGER; C4=BOOLEAN\n");{code}
best
qianjin
> 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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