Horton

Re: remaining sql/json patches

Alvaro Herrera <alvherre@alvh.no-ip.org>

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From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: Amit Langote <amitlangote09@gmail.com>
Cc: jian he <jian.universality@gmail.com>, Tomas Vondra <tomas.vondra@enterprisedb.com>, Himanshu Upadhyaya <upadhyaya.himanshu@gmail.com>, Erik Rijkers <er@xs4all.nl>, Andres Freund <andres@anarazel.de>, Andrew Dunstan <andrew@dunslane.net>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2024-03-28T17:04:51Z
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 2024-Mar-28, Amit Langote wrote:

> Here's patch 1 for the time being that implements barebones
> JSON_TABLE(), that is, without NESTED paths/columns and PLAN clause.
> I've tried to shape the interfaces so that those features can be added
> in future commits without significant rewrite of the code that
> implements barebones JSON_TABLE() functionality.  I'll know whether
> that's really the case when I rebase the full patch over it.

I think this barebones patch looks much closer to something that can be
committed for pg17, given the current commitfest timeline.  Maybe we
should just slip NESTED and PLAN to pg18 to focus current efforts into
getting the basic functionality in 17.  When I looked at the JSON_TABLE
patch last month, it appeared far too large to be reviewable in
reasonable time.  The fact that this split now exists gives me hope that
we can get at least the first part of it.

(A note that PLAN seems to correspond to separate features T824+T838, so
leaving that one out would still let us claim T821 "Basic SQL/JSON query
operators" ... however, the NESTED clause does not appear to be a
separate SQL feature; in particular it does not appear to correspond to
T827, though I may be reading the standard wrong.  So if we don't have
NESTED, apparently we could not claim to support T821.)

-- 
Álvaro Herrera         PostgreSQL Developer  —  https://www.EnterpriseDB.com/
"La fuerza no está en los medios físicos
sino que reside en una voluntad indomable" (Gandhi)