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Re: SQL/JSON: functions

Andrew Dunstan <andrew@dunslane.net>

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From: Andrew Dunstan <andrew@dunslane.net>
To: Himanshu Upadhyaya <upadhyaya.himanshu@gmail.com>
Cc: Nikita Glukhov <n.gluhov@postgrespro.ru>, PostgreSQL-development <pgsql-hackers@postgresql.org>, Dmitry Dolgov <9erthalion6@gmail.com>, Oleg Bartunov <obartunov@postgrespro.ru>, Erik Rijkers <er@xs4all.nl>
Date: 2021-12-15T21:48:09Z
Lists: pgsql-hackers 
On 12/9/21 09:04, Himanshu Upadhyaya wrote:
>
>
>
> 2)
> I am not sure if below is required as per SQL standard, ORACLE is
> allowing to construct JSON_OBJECT bases on the records in the table as
> below, but postgres parser is not allowing:
> create table test (id varchar(10), value int);
> insert into test values ('a',1);
> insert into test values ('b',2);
> insert into test values ('c',3);
> select json_object(*) from test; --postgres does not support
> postgres=# select json_object(*) from test;
> ERROR:  syntax error at or near "*"
> LINE 1: select json_object(*) from test;
>
>

You can spell that a bit differently today, e.g.

    select to_json(r) from test r;

I don't know either if it's in the spec, but building in support for *
in this context seems likely to be fairly complex and have very little
added utility.


cheers


andrew

--
Andrew Dunstan
EDB: https://www.enterprisedb.com

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. JSON_TABLE: Add support for NESTED paths and columns

  2. Add basic JSON_TABLE() functionality

  3. Add SQL/JSON query functions

  4. Add soft error handling to some expression nodes

  5. Adjust populate_record_field() to handle errors softly

  6. Refactor code used by jsonpath executor to fetch variables

  7. Add more SQL/JSON constructor functions

  8. SQL/JSON: support the IS JSON predicate

  9. SQL/JSON: add standard JSON constructor functions

  10. Improve readability of SQL/JSON documentation.

  11. Documentation for SQL/JSON features

  12. RETURNING clause for JSON() and JSON_SCALAR()

  13. SQL JSON functions

  14. SQL/JSON query functions

  15. IS JSON predicate

  16. SQL/JSON constructors

  17. Common SQL/JSON clauses

  18. Doc: remove obsolete entries in table of BRIN strategy numbers.

  19. Doc: standardize markup a bit more.

  20. Make pg_regress.c unset PGDATABASE during make installcheck.

  21. Fix handling of GENERATED columns in CREATE TABLE LIKE INCLUDING DEFAULTS.