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Forward Xu edited comment on CALCITE-2791 at 2/21/19 6:00 AM: -------------------------------------------------------------- hi [~zhztheplayer] Thank you for your advice.I have modified all commits. best qianjin was (Author: x1q1j1): hi [~zhztheplayer] Thank you for your advice. I have modified it. 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(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; > c1 c2 c3 c4 > ======= ======= ======= ======= > OBJECT ARRAY INTEGER BOOLEAN -- This message was sent by Atlassian JIRA (v7.6.3#76005)