Horton

Re: remaining sql/json patches

amit <amitlangote09@gmail.com>

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From: Amit Langote <amitlangote09@gmail.com>
To: jian he <jian.universality@gmail.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Erik Rijkers <er@xs4all.nl>, Andres Freund <andres@anarazel.de>, Andrew Dunstan <andrew@dunslane.net>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2023-12-14T08:10:38Z
Lists: pgsql-hackers

Commits

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

  1. SQL/JSON: Various improvements to SQL/JSON query function docs

  2. SQL/JSON: Fix some obsolete comments.

  3. SQL/JSON: Fix issues with DEFAULT .. ON ERROR / EMPTY

  4. JSON_TABLE: Add support for NESTED paths and columns

  5. Fix JsonExpr deparsing to emit QUOTES and WRAPPER correctly

  6. Fix typo introduced in 6185c9737

  7. Add basic JSON_TABLE() functionality

  8. Avoid splitting errmsg string to span multiple lines

  9. Add SQL/JSON query functions

  10. Implement various jsonpath methods

  11. Add soft error handling to some expression nodes

  12. Adjust populate_record_field() to handle errors softly

  13. Refactor code used by jsonpath executor to fetch variables

  14. Test EXPLAIN (FORMAT JSON) ... XMLTABLE

  15. Simplify productions for FORMAT JSON [ ENCODING name ]

  16. Add trailing commas to enum definitions

  17. doc: add missing <returnvalue> and whitespace

  18. Add more SQL/JSON constructor functions

  19. Rename a nonterminal used in SQL/JSON grammar

  20. Some refactoring to export json(b) conversion functions

  21. Don't include CaseTestExpr in JsonValueExpr.formatted_expr

  22. Code review for commit b6e1157e7d

  23. Pass constructName to transformJsonValueExpr()

  24. Unify JSON categorize type API and export for external use

  25. Make some indentation in gram.y consistent

  26. Allow most keywords to be used as column labels without requiring AS.

  27. Reduce size of backend scanner's tables.

  28. Use perfect hashing, instead of binary search, for keyword lookup.

On Sat, Dec 9, 2023 at 2:05 PM jian he <jian.universality@gmail.com> wrote:
> Hi.

Thanks for the review.

> function JsonPathExecResult comment needs to be refactored? since it
> changed a lot.

I suppose you meant executeJsonPath()'s comment.  I've added a
description of the new callback function arguments.

On Wed, Dec 13, 2023 at 6:59 PM jian he <jian.universality@gmail.com> wrote:
> Hi. small issues I found...
>
> typo:
> +-- Test mutabilily od query functions

Fixed.

>
> + default:
> + ereport(ERROR,
> + (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
> + errmsg("only datetime, bool, numeric, and text types can be casted
> to jsonpath types")));
>
> transformJsonPassingArgs's function: transformJsonValueExpr will make
> the above code unreached.

It's good to have the ereport to catch errors caused by any future changes.

> also based on the `switch (typid)` cases,
> I guess best message would be
> errmsg("only datetime, bool, numeric, text, json, jsonb types can be
> casted to jsonpath types")));

I've rewritten the message to mention the unsupported type.  Maybe the
supported types can go in a DETAIL message.  I might do that later.

> + case JSON_QUERY_OP:
> + jsexpr->wrapper = func->wrapper;
> + jsexpr->omit_quotes = (func->quotes == JS_QUOTES_OMIT);
> +
> + if (!OidIsValid(jsexpr->returning->typid))
> + {
> + JsonReturning *ret = jsexpr->returning;
> +
> + ret->typid = JsonFuncExprDefaultReturnType(jsexpr);
> + ret->typmod = -1;
> + }
> + jsexpr->result_coercion = coerceJsonFuncExprOutput(pstate, jsexpr);
>
> I noticed, if (!OidIsValid(jsexpr->returning->typid)) is the true
> function JsonFuncExprDefaultReturnType may be called twice, not sure
> if it's good or not..

If avoiding the double-calling means that we've to add more conditions
in the code, I'm fine with leaving this as-is.

-- 
Thanks, Amit Langote
EDB: http://www.enterprisedb.com