rawIndex method
Implementation
IndexDefinition rawIndex(String expression, {String? name}) {
final normalized = _normalizeIdentifierSegment(expression);
final definition = IndexDefinition(
name: name ?? '${table}_${normalized}_raw_index',
type: IndexType.regular,
columns: [expression],
raw: true,
driverOptions: const {},
);
_indexes.add(_IndexEntry(definition));
return definition;
}