Contains Spiral patches:
- Spiral Patch 021: 021_mariadb-10.2.0.merge_table.diff MDEV-7719
  - Changes for identifying MyISAM Merge child tables that can be merged.
  - This patch has the following differences compared to the original patch:
    - Changed bit positions for handlerton flags to eliminate conflicts
      with flags merged from MySQL.
- Spiral Patch 048: 048_mariadb-10.2.0.vp_partition.diff MDEV-7744
  - Check and set the partition bitmap.
- Spiral Patch 054: 054_mariadb-10.2.0.for_vp_pruning.diff MDEV-7750
  - Support for vertical partition pruning.
- Spiral Patch 055: 055_mariadb-10.2.0.for_vp_same_columns.diff MDEV-13000
  - Support for MERGE tables in the vertical partition engine.
- Spiral Patch 056: 056_mariadb-10.2.0.partition_top_table_fields.diff
                    MDEV-12970
  - Push down to each partition the table and fields of a vertical partition
    that are mapped to local table fields.
- Spiral Patch 060: 060_mariadb-10.2.0.partition_reset_top_table_fields.diff
                    MDEV-12971
  - Completion of functionality to push down to each partition the table and
    fields of a vertical partition that are mapped to local table fields.