SQLite dialect now checks column existence via PRAGMA table_info, enabling
IfColumnNotExistsCondition to work correctly. Previously, BaseDialect returned
empty SQL, so AddColumn ran unconditionally and could fail with
“duplicate column name” under parallel CI runs.
- Prevents duplicate-column errors in SQLite migrations (e.g. unified storage
adding previous_resource_version) when migration locking/logging don’t serialize
execution.
- No change for other dialects.
Jean-Philippe Quéméner
e6e58c3a56