[jdatcmd]

Covers #1341 items 42, 57 and 83. Test-only: no source change.

What it adds

A new suite, test/settings_reference.sh, and its pytest twin, test_settings_reference.py. They hold docs/configuration.md to pg_settings in both directions:

• Item 42. Every setting the server defines is documented. The exceptions are settings the server marks NOT_IN_SAMPLE: the developer hooks and internal switches (rollup_pause, tier_fault_after, bulk_parallel_writer). Every documented setting exists. Each documented default equals boot_val. Each row's stated condition matches context:
  • "superuser" → superuser;
  • "only at server start" → postmaster;
  • "Reloadable" → sighup;
  • none of these → user.
• Item 57. A role that is not a superuser, on its own login, is refused SET pgcolumnar.enable_end_truncation with 42501. A superuser can set it.
• Item 83. compression_level reaches the zstd codec: the same text stores smaller at level 19 than at level 1. A build without zstd cannot run this check.

A premise check needs at least thirty parsed rows, so a format change that parses nothing cannot pass the comparisons vacuously.

Evidence

• Green: 8/8 on each of PG15–19, and the twin 4/4 on each.
• All 8 checks were seen red on PG17, one mutant at a time. Both twins went red on the first four:

mutant	checks that went red
enable_end_truncation defined PGC_USERSET	condition; 42501 refusal (got ok)
enable_end_truncation defined PGC_POSTMASTER	condition; refusal (got 55P02); superuser control
compression_level default 3 → 5	default
try_zstd passes level 1, not the setting	level (1073152 vs 1073152)
the compression_level row deleted from the reference	undocumented
the row renamed compression_levl	existence, undocumented, default, condition
the backticks removed from every name	the thirty-settings premise, undocumented

• Ledger: 2774 + 8 = 2782 rows, 2095 never (unchanged), 687 dated. The gate passes against origin/main. The ceiling stays 234.
• Registration: run_all_versions.sh, test_compare_to_bash.py COMPLETE, TESTS.md §115. cluster_tests goes 565 → 569 by collection. The guard set passes 433/433, including test_collation_pinned.py: every sort, comm and join sets LC_ALL=C itself.

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https://claude.ai/code/session_019VvWuX1zUwk6Y513waRd4N

[OffgridwithJD]

@jdatcmd Reviewed a9484e3.

• What it holds: the reference and pg_settings name the same settings (NOT_IN_SAMPLE aside), each documented default is boot_val, and each documented condition is context. A plain login is refused enable_end_truncation with 42501 and a superuser can set it. zstd level 19 stores less than level 1. The two parsers agree: over today's configuration.md both give the same 45 rows.
• Red (PG17): enable_end_truncation as PGC_USERSET reddens the condition arm and a role that is not a superuser cannot set enable_end_truncation (42501): got [ok] want [42501], in both twins. try_zstd passing level 1 gives got [1073152 vs 1073152] want [less] in both. The .so md5 changed for each mutant and came back on restore.
• Green: 8/8 and 4 passed on PG17 and PG18. The guard half gives 433 passed, cluster_tests is 569 by collection, the census (2782 / 2095 / 687) matches, and the gate passes at 234.
• Blocker: the shell's default and condition arms feed comm input it doesn't consider sorted, so a red arm names settings that are correct. doc_rows sorts on field 1 only (sort -t'|' -k1,1), but comm compares whole lines. In C order | sorts after _, so pgcolumnar.autovacuum|… belongs after pgcolumnar.autovacuum_compact_threshold|…. With "Reloadable" taken out of the pgcolumnar.autovacuum row only, pytest names one setting (pgcolumnar.autovacuum: doc user, server sighup). The shell names ten entries, five settings on each side, four of them unchanged: got [pgcolumnar.autovacuum|sighup pgcolumnar.autovacuum_compact_threshold|sighup pgcolumnar.autovacuum_expire|sighup pgcolumnar.autovacuum_naptime|sighup pgcolumnar.autovacuum_recluster_threshold|sighup pgcolumnar.autovacuum|user …]. Every run, green ones included, also logs comm: file 1 is not in sorted order … input is not in sorted order twice. The verdict is still right (I found no way for a difference to come out as none), but the failure text points at the wrong settings, and the stderr noise is constant. Sorting each side after the cut fixes it: comm -3 <(cut -d'|' -f1,3 <<<"$docd" | LC_ALL=C sort) <(cut -d'|' -f1,3 <<<"$srv_docd" | LC_ALL=C sort), and the same for -f1,2. With that change, the same mutation reports exactly got [pgcolumnar.autovacuum|sighup pgcolumnar.autovacuum|user] with no order warnings, and green stays 8/8.

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[jdatcmd]

@OffgridwithJD, fixed in b1006ec as you suggested: each side of the default and condition comparisons is sorted again after its cut.

• Your case, before the fix (PG17): with "Reloadable" taken out of the pgcolumnar.autovacuum row only, the condition arm named ten entries, and the run logged six comm sort-order warnings.
• After: the same mutation gives exactly got [pgcolumnar.autovacuum|sighup pgcolumnar.autovacuum|user], with 0 warnings.
• The default arm: with that row's documented default changed from off to on, it gives exactly got [pgcolumnar.autovacuum|off pgcolumnar.autovacuum|on], with 0 warnings.
• Green: 8/8 on PG17 and PG18, with 0 warnings.
• The other two comm calls (names only, lines 58 and 60) were already safe: each side is the name field alone, which sort -k1,1 and ORDER BY name COLLATE "C" both put in C order. I left them as they were.

No check names changed, so the ledger rows and the census don't move. The pytest twin is untouched.

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[OffgridwithJD]

Approved at b1006ec. The sort fix does what it says.

Measured on PG18, with "Reloadable" changed to "Restart-only" in the pgcolumnar.autovacuum row of docs/configuration.md:

tree	result	comm order warnings
b1006ec, docs clean	8 passed + 0 failed	0
b1006ec, docs mutated	7 + 1: each documented condition is the server's context for the setting: got [pgcolumnar.autovacuum|sighup pgcolumnar.autovacuum|user] want [none]	0
the sort reverted to a9484e3's, docs mutated	7 + 1: got [pgcolumnar.autovacuum|sighup pgcolumnar.autovacuum_compact_threshold|sighup pgcolumnar.autovacuum_expire|sighup ... (the ten-entry list again)	6
restored	8 passed + 0 failed	0

I agree the two name-only comm calls were already safe. No CI had reported on b1006ec at the time of review, probably because it conflicts with main; please rebase so it runs.

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[jdatcmd]

@OffgridwithJD, restated as 1e4898f, on top of #1418 (de6e61d) in my merge chain (#1412 → #1417 → #1418 → this). The changed lines are identical to b1006ec, the head you approved, except for re-derived bookkeeping:

• the budget paragraph, on test: ALTER TABLE forms that read every row see the live rows and only those (#1341) #1418's census: 2992 rows, 2278 never, 714 dated, as derived from the tsv;
• cluster_tests 574, matching collection;
• the TESTS.md section number, now 116 because test: ALTER TABLE forms that read every row see the live rows and only those (#1341) #1418 took 115.

The ledger rows are unchanged. The gate gives rc=0 and the guard set passes 435/435.

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[OffgridwithJD]

Re-approved at 1e4898f, stacked on #1418.

• Same patch: this PR's own commits match what I approved at b1006ec: the same code and the same ledger rows, with TESTS.md the same apart from section numbers.
• Census: 2992 / 2278 / 714 from the tsv, matching the paragraph. suites_not_covered is 231.
• CI at the time of review: 12 pass, 1 pending.

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