Backup and Restore support view and external table

[EmmyMiao87]

Background

Existing function

Only olap table backup is supported, and the name of the table to be backed up must be manually declared, which is inconvenient for full database backup.

Requirement

1. backup full database, data or metadata, partial table
2. backup an restore view, external table, related resources etc.
3. When restoring, overwrite all data in the existing table, if it does not exist, create a new table directly
4. backup the entire database but only restores individual tables during restore.
5. The backup support excludes some tables that are too large, and backs up the others.

API design

BACKUP SNAPSHOT [db_name].{snapshot_name}

TO 'repo_name'

[on clause]

[EXCLUDE (

    'table_name' [partition (p1,...)]

)]

[properties (

    "content" = "metadata_only|data_only"

)]



RESTORE SNAPSHOT [db_name].{snapshot_name}

TO 'repo_name'

[on clause]

[EXCLUDE (

    'table_name' [partition (p1,...)]

)]

[properties (

    "content" = "metadata_only|data_only"

)]