If they are defined, they can override table-level settings.
{
        return DB::extractKeyExpressionList(node);
    }
    /** Create local backup (snapshot) for parts with specified prefix.
      * Backup is created in directory clickhouse_dir/shadow/i/, where i - incremental number,
      *  or if 'with_name' is specified - backup is created in directory with specified name.
      */
    PartitionCommandsResultInfo freezePartition(
        const ASTPtr & partition,
        const StorageMetadataPtr & metadata_snapshot,
        const String & with_name,
        ContextPtr context,
        TableLockHolder & table_lock_holder);
    
    PartitionCommandsResultInfo freezeAll(
        const String & with_name,
        const StorageMetadataPtr & metadata_snapshot,
        ContextPtr context,
        TableLockHolder & table_lock_holder);
    
    PartitionCommandsResultInfo unfreezePartition(
        const ASTPtr & partition,
        const String & backup_name,
        ContextPtr context,
        TableLockHolder & table_lock_holder);