AIP-157 Partial Response view for Database Entity.
Values:
DATABASE_ENTITY_VIEW_UNSPECIFIED (0):
Unspecified view. Defaults to basic view.
DATABASE_ENTITY_VIEW_BASIC (1):
Default view. Does not return DDLs or Issues.
DATABASE_ENTITY_VIEW_FULL (2):
Return full entity details including
mappings, ddl and issues.
DATABASE_ENTITY_VIEW_ROOT_SUMMARY (3):
Top-most (Database, Schema) nodes which are returned
contains summary details for their decendents such as the
number of entities per type and issues rollups. When this
view is used, only a single page of result is returned and
the page_size property of the request is ignored. The
returned page will only include the top-most node types.
