ensureSchemaMatches
Ensures the destination table schema matches the expected stream schema through introspection and reconciliation.
This method performs a comprehensive schema synchronization process:
Introspects the current table schema if it exists
Compares it against the expected stream schema
Identifies required schema modifications (new columns, type changes, constraint updates)
Applies safe schema evolution strategies specific to the database implementation
Handles edge cases like incompatible type changes or constraint violations
The implementation must handle various complexities:
Column name normalization and mapping between source and destination naming conventions
Type system differences between the source platform and destination database
Nullable vs non-nullable column conversions
Primary key and unique constraint management during deduplication mode changes
Database-specific limitations (e.g., maximum column count, type restrictions)
Backward compatibility when schema evolution would break existing data
Parameters
The source stream containing schema definition and sync mode configuration
The destination table to be synchronized
Mapping between logical column names and physical database column names
Throws
if the table exists but is incompatible with Airbyte's requirements
if schema evolution cannot be safely performed