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Included review availability: Your plan provides up to 8 included reviews per hour; 4 remain after this review. WalkthroughPartitioned-table schema diffs now skip generic partition handling during rebuilds. Rebuild SQL avoids mutating comparison data and conditionally creates a temporary default partition, which it drops after copying rows only if it is empty. Regression tests cover partition counts, row preservation, and follow-up comparisons. ChangesPartition rebuild behavior
Priority: ⚪ Not assessed Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant SchemaDiff
participant PartitionDiffSQL
participant ReplacementTable
SchemaDiff->>PartitionDiffSQL: pass scaffolding flag and temporary names
PartitionDiffSQL->>ReplacementTable: create default partition when scaffolding is enabled
PartitionDiffSQL->>ReplacementTable: copy source rows
PartitionDiffSQL->>ReplacementTable: drop default partition if empty
Merge Risk: ⚪ Minimal · up to The partition rebuild now preserves unmatched rows and removes only empty temporary partitions. No actionable merge-blocking risk remains in the reviewed change. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🧪 Generate unit tests (beta)
🛠️ Fix failing CI checks 💡
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Inline comments:
In
`@web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/partitions/sql/pg/default/partition_diff.sql`:
- Around line 4-16: Update the scaffold default-partition name in both
web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/partitions/sql/pg/default/partition_diff.sql
lines 4-16 and
web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/partitions/sql/ppas/default/partition_diff.sql
lines 4-16 to derive it from the randomized temporary table name, and use that
same unique name for creation and DROP TABLE cleanup; no other changes are
needed.
- Around line 12-16: Before dropping the scaffolding default partition, validate
that it is empty and abort if it contains rows; update the conditional block in
partition_diff.sql for both
web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/partitions/sql/pg/default/partition_diff.sql
lines 12-16 and
web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/partitions/sql/ppas/default/partition_diff.sql
lines 12-16. Preserve the existing DROP TABLE behavior only for an empty
scaffold.
In `@web/pgadmin/tools/schema_diff/tests/test_schema_diff_partition_default.py`:
- Around line 37-81: Extend the schema-diff fixture test around DDL_SOURCE and
DDL_TARGET to insert rows into both the regular and DEFAULT partitions of each
target table before rebuilding. After each rebuild, assert the expected row
counts in the corresponding partitions, covering INSERT ... SELECT data copying
and routing for both partition configurations.
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web/pgadmin/browser/server_groups/servers/databases/schemas/tables/partitions/__init__.pyweb/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/partitions/sql/pg/default/partition_diff.sqlweb/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/partitions/sql/ppas/default/partition_diff.sqlweb/pgadmin/tools/schema_diff/tests/test_schema_diff_partition_default.py
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scaffold default partitions, and skip redundant partition ALTER diff Address CodeRabbit review findings on the partitioned-table rebuild added in pgadmin-org#10301: - The scaffolding default partition's name was derived from the original table's name (<table>_default), a deterministic name that can collide with an existing relation. Derive it from the already string.randomised temporary table name instead, matching the collision-avoidance convention already used for the temp partitioned table and its temp partitions. - The scaffolding default partition was unconditionally dropped once the row copy finished. Any row from the source table that fell outside every real partition's bounds landed in that scaffold and was silently destroyed. The generated SQL now only drops the scaffold if it is still empty; otherwise it is kept, so the rows it caught survive as the default partition of the rebuilt table. - Separately, found and fixed a data-loss bug this exposed: whenever a table's partitions differ on both source and target, the generic table-diff also ran its own ALTER-based partition add/remove/detach logic (get_sql_from_table_diff/_check_for_partitions_in_sql) alongside the full-table rebuild path in schema_diff_table_utils.py. Because that generic path detaches a bound-changed partition using its real name before the rebuild's row-copy INSERT ... SELECT runs against the original table, the detached partition's rows were invisible to that copy and got dropped when the rebuild's own cleanup step removed the now-standalone table - causing the run-python-tests-pg/run-feature-tests-pg CI failures on PR pgadmin-org#10316. The generic partition diffing is now skipped whenever both sides are partitioned, since the rebuild path already handles every partition difference itself. - Strengthened the regression test: both fixtures now carry real rows (including rows that only fit a DEFAULT partition, and a row outside every rebuilt partition's bounds) so the row-copy and row-routing paths are actually exercised, not just the DDL shape.
scaffold default partitions, and skip redundant partition ALTER diff Address CodeRabbit review findings on the partitioned-table rebuild added in pgadmin-org#10301: - The scaffolding default partition's name was derived from the original table's name (<table>_default), a deterministic name that can collide with an existing relation. Derive it from the already string.randomised temporary table name instead, matching the collision-avoidance convention already used for the temp partitioned table and its temp partitions. - The scaffolding default partition was unconditionally dropped once the row copy finished. Any row from the source table that fell outside every real partition's bounds landed in that scaffold and was silently destroyed. The generated SQL now only drops the scaffold if it is still empty; otherwise it is kept, so the rows it caught survive as the default partition of the rebuilt table. - Separately, found and fixed a data-loss bug this exposed: whenever a table's partitions differ on both source and target, the generic table-diff also ran its own ALTER-based partition add/remove/detach logic (get_sql_from_table_diff/_check_for_partitions_in_sql) alongside the full-table rebuild path in schema_diff_table_utils.py. Because that generic path detaches a bound-changed partition using its real name before the rebuild's row-copy INSERT ... SELECT runs against the original table, the detached partition's rows were invisible to that copy and got dropped when the rebuild's own cleanup step removed the now-standalone table - causing the run-python-tests-pg/run-feature-tests-pg CI failures on PR pgadmin-org#10316. The generic partition diffing is now skipped whenever both sides are partitioned, since the rebuild path already handles every partition difference itself. - Strengthened the regression test: both fixtures now carry real rows (including rows that only fit a DEFAULT partition, and a row outside every rebuilt partition's bounds) so the row-copy and row-routing paths are actually exercised, not just the DDL shape.
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Pushed a fix for the failing
The repeat was only fatal because Both levels are fixed: Note that the same fix is on #10305, which was failing for the same reason; whichever of the two lands second will carry an identical change. |
scaffold default partitions, and skip redundant partition ALTER diff Address CodeRabbit review findings on the partitioned-table rebuild added in pgadmin-org#10301: - The scaffolding default partition's name was derived from the original table's name (<table>_default), a deterministic name that can collide with an existing relation. Derive it from the already string.randomised temporary table name instead, matching the collision-avoidance convention already used for the temp partitioned table and its temp partitions. - The scaffolding default partition was unconditionally dropped once the row copy finished. Any row from the source table that fell outside every real partition's bounds landed in that scaffold and was silently destroyed. The generated SQL now only drops the scaffold if it is still empty; otherwise it is kept, so the rows it caught survive as the default partition of the rebuilt table. - Separately, found and fixed a data-loss bug this exposed: whenever a table's partitions differ on both source and target, the generic table-diff also ran its own ALTER-based partition add/remove/detach logic (get_sql_from_table_diff/_check_for_partitions_in_sql) alongside the full-table rebuild path in schema_diff_table_utils.py. Because that generic path detaches a bound-changed partition using its real name before the rebuild's row-copy INSERT ... SELECT runs against the original table, the detached partition's rows were invisible to that copy and got dropped when the rebuild's own cleanup step removed the now-standalone table - causing the run-python-tests-pg/run-feature-tests-pg CI failures on PR pgadmin-org#10316. The generic partition diffing is now skipped whenever both sides are partitioned, since the rebuild path already handles every partition difference itself. - Strengthened the regression test: both fixtures now carry real rows (including rows that only fit a DEFAULT partition, and a row outside every rebuilt partition's bounds) so the row-copy and row-routing paths are actually exercised, not just the DDL shape.
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…a partitioned table (pgadmin-org#10301) Rebuilding a partitioned table (e.g. because its partition key changed) generates a script that creates a temporary partitioned table, adds a DEFAULT partition to it purely so the row-copy INSERT doesn't fail on rows that match none of the real partitions, copies the rows across and renames everything into place. The scaffolding DEFAULT partition was never removed, so a source table with no default partition of its own ended up with an extra one in the rebuilt target, and Schema Diff would report the table as different forever after. Worse, if the source table did have a genuine default partition, the generated script tried to create it as well as the scaffolding one, and Postgres only allows a single DEFAULT partition per parent, so applying the script failed outright. get_sql_from_diff() now checks whether the source table already has a default partition and only asks the template to scaffold one when it doesn't; partition_diff.sql only creates that scaffolding partition (and drops it again once the row copy is done) in that case, leaving a genuine source default partition to be carried across, renamed into place, by the normal per-partition rename loop. Added test_schema_diff_partition_default.py, covering both a source table without a default partition (the scaffolding one must be dropped) and one with a genuine default partition (it must survive and the script must not attempt to create two).
scaffold default partitions, and skip redundant partition ALTER diff Address CodeRabbit review findings on the partitioned-table rebuild added in pgadmin-org#10301: - The scaffolding default partition's name was derived from the original table's name (<table>_default), a deterministic name that can collide with an existing relation. Derive it from the already string.randomised temporary table name instead, matching the collision-avoidance convention already used for the temp partitioned table and its temp partitions. - The scaffolding default partition was unconditionally dropped once the row copy finished. Any row from the source table that fell outside every real partition's bounds landed in that scaffold and was silently destroyed. The generated SQL now only drops the scaffold if it is still empty; otherwise it is kept, so the rows it caught survive as the default partition of the rebuilt table. - Separately, found and fixed a data-loss bug this exposed: whenever a table's partitions differ on both source and target, the generic table-diff also ran its own ALTER-based partition add/remove/detach logic (get_sql_from_table_diff/_check_for_partitions_in_sql) alongside the full-table rebuild path in schema_diff_table_utils.py. Because that generic path detaches a bound-changed partition using its real name before the rebuild's row-copy INSERT ... SELECT runs against the original table, the detached partition's rows were invisible to that copy and got dropped when the rebuild's own cleanup step removed the now-standalone table - causing the run-python-tests-pg/run-feature-tests-pg CI failures on PR pgadmin-org#10316. The generic partition diffing is now skipped whenever both sides are partitioned, since the rebuild path already handles every partition difference itself. - Strengthened the regression test: both fixtures now carry real rows (including rows that only fit a DEFAULT partition, and a row outside every rebuilt partition's bounds) so the row-copy and row-routing paths are actually exercised, not just the DDL shape.
…ES list The rebuilt partitioned table no longer keeps its scaffolding default partition, so table_for_partition_1 now settles once the generated script has been applied and the comparison test fails on the stale entry, as it is designed to. Take the entry off, leaving the list empty.
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What this is
Rebuilding a partitioned table (e.g. because its partition key changed) generates a script that creates a temporary partitioned table, adds a
DEFAULTpartition to it purely so the row-copyINSERTdoesn't fail on rows that match none of the real partitions, copies the rows across, and renames everything into place. The scaffoldingDEFAULTpartition was never removed, so a source table with no default partition of its own ended up with an extra one in the rebuilt target, and Schema Diff reported the table as different forever after.Worse, if the source table did have a genuine default partition, the generated script tried to create it as well as the scaffolding one, and PostgreSQL only allows a single
DEFAULTpartition per parent, so applying the script failed outright.The fix
get_sql_from_diff()now checks whether the source table already has a default partition and only asks the template to scaffold one when it doesn't;partition_diff.sqlonly creates that scaffolding partition (and drops it again once the row copy is done, provided it is still empty, so rows that fit none of the real partitions are kept rather than destroyed) in that case, leaving a genuine source default partition to be carried across, renamed into place, by the normal per-partition rename loop.The scaffolding partition's name is now derived from the randomised temporary table name, so it cannot collide with an existing relation. When both sides are partitioned, the generic ALTER-based partition diff is also skipped, because it detached bound-changed partitions ahead of the rebuild's row copy and so lost their rows.
Testing
Added
test_schema_diff_partition_default.py, covering both a source table without a default partition (the scaffolding one must be dropped) and one with a genuine default partition (it must survive and the script must not attempt to create two).table_for_partition_1now settles in the Schema Diff comparison test, so it comes offKNOWN_DIFFERENCES.tools.schema_diffandbrowser.server_groups.servers.databases.schemas.tables(473 tests) pass against PostgreSQL 18;pycodestyleis clean.Fixes #10301.
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