Horton

Re: WIP Incremental JSON Parser

Andrew Dunstan <andrew@dunslane.net>

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From: Andrew Dunstan <andrew@dunslane.net>
To: Nathan Bossart <nathandbossart@gmail.com>, Jelte Fennema-Nio <postgres@jeltef.nl>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Amit Langote <amitlangote09@gmail.com>, Jacob Champion <jacob.champion@enterprisedb.com>, Robert Haas <robertmhaas@gmail.com>, Peter Smith <smithpb2250@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2024-04-04T19:31:12Z
Lists: pgsql-hackers

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On 2024-04-04 Th 14:06, Nathan Bossart wrote:
> Apologies for piling on, but my compiler (gcc 9.4.0) is unhappy:
>
> ../postgresql/src/common/jsonapi.c: In function ‘IsValidJsonNumber’:
> ../postgresql/src/common/jsonapi.c:2016:30: error: ‘dummy_lex.inc_state’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
>   2016 |  if (lex->incremental && !lex->inc_state->is_last_chunk &&
>        |                           ~~~^~~~~~~~~~~
> ../postgresql/src/common/jsonapi.c:2020:36: error: ‘dummy_lex.token_start’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
>   2020 |           lex->token_start, s - lex->token_start);
>        |                                 ~~~^~~~~~~~~~~~~
> ../postgresql/src/common/jsonapi.c:302:26: error: ‘numeric_error’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
>    302 |  return (!numeric_error) && (total_len == dummy_lex.input_length);
>        |         ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>

Please pile on. I want to get this fixed.


It seems odd that my much later gcc didn't complain.


Does the attached patch fix it for you?


cheers


andrew







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

Commits

  1. Post review fixes for test_json_parser test module

  2. Shrink test file for test_json_parser module

  3. Add support for incrementally parsing backup manifests

  4. Introduce a non-recursive JSON parser

  5. Use incremental parsing of backup manifests.