Schema Diff: complete the SERIAL/integer column conversion script - #10318
Schema Diff: complete the SERIAL/integer column conversion script#10318dpage wants to merge 2 commits into
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…admin-org#10292) Schema Diff compares a SERIAL column by reprojecting it onto the SERIAL pseudo-type, which implies its nextval() default rather than stating it, so the reprojection empties the default before comparison. Once a column genuinely differs in "serialness" from its counterpart, that emptied default was all update.sql had to work from, so converting a plain column to SERIAL produced a script that changed the type and created the owned sequence but never set the column's DEFAULT, leaving the column unusable as a SERIAL. BaseTableView._normalise_serial_column() now distinguishes three cases instead of one: both sides SERIAL (unchanged, drop the emptied default only), becoming SERIAL (recreate the sequence from the default preserved under the new 'serial_defval' key and restore the default once the sequence exists), and leaving SERIAL (drop the default before dropping the now-unused sequence, since PostgreSQL refuses to drop a sequence a column's default still references). update.sql renders the new CREATE/DROP SEQUENCE statements around the existing DEFAULT handling in the right order for both directions, self-contained within the column's own diff so it doesn't depend on Schema Diff's separate, unordered sequence-object comparison. The "leaving SERIAL" case is guarded to require an explicit 'cltype' in the payload, since the same normalisation runs for the ordinary column PUT, where a partial update that only changes a comment or a privilege on an already-SERIAL column carries no 'cltype' at all and must be left alone.
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WalkthroughSchema Diff now preserves reprojected SERIAL defaults, creates and owns sequences during integer-to-SERIAL conversions, and drops sequences after removing SERIAL defaults. Unit and integration tests cover both conversion directions and partial updates. ChangesSERIAL conversion handling
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to Serial-column conversions can fail for valid sequence names and may reassign ownership of an unrelated existing sequence, causing incorrect or destructive schema changes. The PR is not merge-ready until both cases are addressed. Possibly related PRs
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In
`@web/pgadmin/browser/server_groups/servers/databases/schemas/tables/columns/utils.py`:
- Around line 312-313: Update parse_nextval_sequence to decode PostgreSQL
string-literal escaping in the matched regclass value before returning the
sequence identifier, preserving identifiers containing escaped single quotes
such as public."id'seq". Add a regression test covering this escaped-quote case
and verify the returned identifier matches the sequence name used by the DDL.
In
`@web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/columns/sql/16_plus/update.sql`:
- Around line 24-40: Remove IF NOT EXISTS from the CREATE SEQUENCE statements in
web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/columns/sql/16_plus/update.sql
lines 24-40 and
web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/columns/sql/default/update.sql
lines 24-40. Keep the subsequent ALTER SEQUENCE ownership logic unchanged so
conflicting sequence names cause the script to stop before reassigning
ownership.
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web/pgadmin/browser/server_groups/servers/databases/schemas/tables/columns/utils.pyweb/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/columns/sql/16_plus/update.sqlweb/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/columns/sql/default/update.sqlweb/pgadmin/browser/server_groups/servers/databases/schemas/tables/tests/test_normalise_serial_column_unit.pyweb/pgadmin/browser/server_groups/servers/databases/schemas/tables/utils.pyweb/pgadmin/tools/schema_diff/tests/test_schema_diff_serial_conversion.py
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…icts in SERIAL conversion (pgadmin-org#10292) parse_nextval_sequence() left doubled single quotes undecoded when a sequence name itself contained a quote (e.g. "id'seq"), producing a wrong identifier when spliced verbatim into CREATE/ALTER/DROP SEQUENCE DDL rather than back into a string literal. CREATE SEQUENCE IF NOT EXISTS in the generated conversion script could also silently skip an existing, unrelated relation of the same name (without checking it is even a sequence), after which the unconditional ALTER SEQUENCE ... OWNED BY would reassign ownership of that unrelated object. Dropping IF NOT EXISTS makes a name collision fail loudly instead.
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What this is
Schema Diff compares a SERIAL column by reprojecting it onto the SERIAL pseudo-type, which implies its
nextval()default rather than stating it, so the reprojection empties the default before comparison. Once a column genuinely differs in "serialness" from its counterpart, that emptied default was allupdate.sqlhad to work from, so converting a plain column to SERIAL produced a script that changed the type and created the owned sequence but never set the column'sDEFAULT, leaving the column unusable as a SERIAL (inserts omitting it failed on the target but succeeded on the source).The fix
BaseTableView._normalise_serial_column()now distinguishes three cases instead of one:serial_defvalkey, and restore the default once the sequence exists.update.sqlrenders the newCREATE/DROP SEQUENCEstatements around the existingDEFAULThandling in the right order for both directions, self-contained within the column's own diff so it doesn't depend on Schema Diff's separate, unordered sequence-object comparison.The "leaving SERIAL" case is guarded to require an explicit
cltypein the payload, since the same normalisation runs for the ordinary column PUT, where a partial update that only changes a comment or a privilege on an already-SERIAL column carries nocltypeat all and must be left alone.Testing
Added unit tests for
_normalise_serial_column()covering all four cases (including the partial-update regression guard), and an end-to-end Schema Diff test converting a column both directions, asserting correct statement ordering and that applying the script round-trips both tables to Identical.tools.schema_diffandbrowser.server_groups.servers.databases.schemas.tables(473 tests) pass against PostgreSQL 18;pycodestyleis clean.Fixes #10292.
Summary by CodeRabbit
Bug Fixes
SERIAL,BIGSERIAL, andSMALLSERIALtypes.nextvaldefaults during serial-column updates.Tests