Fix collation/ctype query error for non-default LC_COLLATE (#9798) - #10040
Fix collation/ctype query error for non-default LC_COLLATE (#9798)#10040dpage wants to merge 3 commits into
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WalkthroughThe ChangesDatabase Locale Provider Fix
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The database-query fix is localized, and the only noted issue affects how test encodings are filtered rather than runtime behavior. No actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Pull request overview
Fixes a PostgreSQL 16+ / 17+ SQL-template bug that could raise “more than one row returned by a subquery used as an expression” when a database has non-default LC_COLLATE/LC_CTYPE, preventing pgAdmin from populating/unlocking the collation/ctype fields in the database create/edit UI.
Changes:
- Rewrote
get_ctypes.sqlfor PG 16+ and 17+ to return rows via guardedUNIONselects (instead of a scalar subquery in aCASEexpression). - Added a 9.16 release note entry referencing Issue #9798.
Reviewed changes
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| File | Description |
|---|---|
| web/pgadmin/browser/server_groups/servers/databases/templates/databases/sql/16_plus/get_ctypes.sql | Avoids scalar-subquery multi-row errors by returning locale/ctype values as a simple row set. |
| web/pgadmin/browser/server_groups/servers/databases/templates/databases/sql/17_plus/get_ctypes.sql | Same fix as 16+, using the PG 17+ column layout. |
| docs/en_US/release_notes_9_16.rst | Documents the bug fix in the 9.16 release notes. |
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The 16_plus fix is correct (PG16 has no builtin provider, so <> 'i' ≡ = 'c' in practice). The 17_plus fix is wrong:
SELECT datlocale AS cname … WHERE datlocprovider = 'i'
UNION
SELECT datcollate AS cname … WHERE datlocprovider <> 'i'
UNION
SELECT datctype AS cname … WHERE datlocprovider <> 'i'PG17's datlocprovider has three values: 'c' (libc), 'i' (icu), 'b' (builtin). <> 'i' matches both libc AND builtin. For a builtin-provider database, the locale lives in datlocale — but the locale branch is guarded by = 'i', so datlocale is omitted entirely and datcollate / datctype get returned instead.
The existing properties.sql for 17_plus already treats ICU and builtin identically (reads datlocale for both); this fix should mirror that:
SELECT datlocale … WHERE datlocprovider IN ('i', 'b')
UNION
SELECT datcollate … WHERE datlocprovider = 'c'
UNION
SELECT datctype … WHERE datlocprovider = 'c'Also: no resql test was added for the bug case (libc DB where datcollate != datctype, e.g. en_US.UTF-8 / C) — the regression that prompted #6481 has no automated coverage.
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Inline comments:
In
`@web/pgadmin/browser/server_groups/servers/databases/tests/test_db_get_ctypes.py`:
- Around line 136-138: Update the test setup around _create_database so it skips
only when self.template_encoding is unsupported by ICU, rather than skipping all
non-UTF8 encodings. Preserve coverage for PostgreSQL-supported non-UTF8 ICU
encodings and continue creating the database for supported values.
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web/pgadmin/browser/server_groups/servers/databases/templates/databases/sql/16_plus/get_ctypes.sqlweb/pgadmin/browser/server_groups/servers/databases/templates/databases/sql/17_plus/get_ctypes.sqlweb/pgadmin/browser/server_groups/servers/databases/tests/test_db_get_ctypes.py
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…rg#9798 get_ctypes.sql for PG 16+/17+ wrapped a multi-row UNION inside a scalar subquery in a CASE ELSE branch. When the database is not ICU-based and datcollate != datctype (e.g. LC_COLLATE=C with a different ctype), the scalar subquery returned two rows -> "more than one row returned by a subquery used as an expression", which locked the collation input. Rewrite as a flat UNION of guarded SELECTs returning cname rows, matching how the handler already consumes the result (a list of rows). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
PostgreSQL 17 added a third value to datlocprovider, 'b' for the builtin provider, so testing for <> 'i' lumps builtin in with libc. A builtin database keeps its locale in datlocale exactly as an ICU one does, and the datcollate and datctype it carries are merely inherited from its template, so the dialog offered a locale the database does not collate with and omitted the one it does. Verified against PostgreSQL 18: a database created with BUILTIN_LOCALE 'C.UTF-8' from an en_GB.UTF-8 template reported en_GB.UTF-8 before this change and C.UTF-8 after it. This matches 17_plus/properties.sql, which already reads datlocale for both providers. The 16_plus template keeps <> 'i' because PostgreSQL 16 has only the two providers, so there is nothing else for it to match. Tests run the versioned template against a database created with each provider in turn, which also covers the bucket selection, and assert that a libc database reports both its collation and its character type even when they differ, the case that pgadmin-org#9798 came from.
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The ICU scenario ran unconditionally, but LOCALE_PROVIDER/ICU_LOCALE on CREATE DATABASE was only added in PostgreSQL 15, so it failed with "option \"locale_provider\" not recognized" against PG14 in CI. The builtin scenario probes with a fixed BUILTIN_LOCALE 'C.UTF-8', and skipped only when template0's own datcollate was exactly 'C' or 'POSIX'. Several CI runners have template0 already on 'C.UTF-8', which is the only UTF-8 locale a builtin database can use, so the created database's locale collided with the template's inherited one and assertNotIn(self.template_collate, reported) failed spuriously. Skip that scenario too when template0 is already 'C.UTF-8'.
Summary
Fixes #9798.
Creating/editing a database with a non-default
LC_COLLATE/LC_CTYPE(e.g.LC_COLLATE=C) failed withmore than one row returned by a subquery used as an expression, which locked the collation input.Root cause:
get_ctypes.sql(PG 16+ and 17+) wrapped a multi-rowUNIONinside a scalar subquery in aCASE ... ELSEbranch. For a non-ICU database wheredatcollate != datctype, that branch returns two rows → scalar-subquery error.Fix: rewrite as a flat
UNIONof guardedSELECTs returningcnamerows (keyed ondatlocprovider), which is exactly what theget_ctypeshandler already expects (it iteratesrset['rows']). This mirrors the pre-16defaulttemplate's flat shape.Changes
databases/sql/16_plus/get_ctypes.sql,databases/sql/17_plus/get_ctypes.sql🤖 Generated with Claude Code
Summary by CodeRabbit
Bug Fixes
Tests