[teiid-issues] [JBoss JIRA] (TEIID-5481) Evaluate JSONPATH as expression language for Json payload to table

[Steven Hawkins (Jira)]

    [ https://issues.jboss.org/browse/TEIID-5481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737250#comment-13737250 ] 

Steven Hawkins edited comment on TEIID-5481 at 5/22/19 8:24 AM:
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There will be two functions:

jsonquery(json|clob, jsonPath [, null_for_missing]) returns json - roughly the same functionality as xmlquery.  

jsonpathvalue(json|clob, jsonPath [, null_for_missing]) returns string - roughly the same functionality as xpathvalue (returns a string value of a single item)

Neither quite match the semantics of the pg logic, but will be familiar to those who know jsonpath.  The jayway implementation uses 0-based indexing - which does not seem to be consistent across implementations.


was (Author: shawkins):
There will be two functions:

jsonquery(json, jsonPath) returns json - roughly the same functionality as xmlquery.  

jsonpathvalue(json, jsonPath) returns string - roughly the same functionality as xpathvalue (returns a string value of a single item)

Neither quite match the semantics of the pg logic, but will be familiar to those who know jsonpath.  The jayway implementation uses 0-based indexing - which does not seem to be consistent across implementations.

> Evaluate JSONPATH as expression language for Json payload to table
> ------------------------------------------------------------------
>
>                 Key: TEIID-5481
>                 URL: https://issues.jboss.org/browse/TEIID-5481
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>            Reporter: Ramesh Reddy
>            Assignee: Steven Hawkins
>            Priority: Major
>             Fix For: 12.3
>
>
> Currently in Teiid in order to turn a JSON document to a relational structure, JSONTOXML function is used then XPATH used on it to retrieve data using XMLTABLE.
> Investigate the feasibility of using JSONPATH [1]  directly on JSON document to build a JSONTABLE construct.
> [1] https://code.google.com/archive/p/json-path/



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