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Jack Ye
5f00e7ddee
A view is a named query a database stores and plans on every read. It
holds no rows, which is the whole difference from a materialized view.
Adds `create_view`, `describe_view`, `drop_view` and `list_views` on
`Connection` and the `Database` trait, the remote client that speaks
`/v1/view/{id}/*` and `/v1/namespace/{id}/view/list`, and the Python and
Node bindings. Local databases return `NotSupported`; the server side
lives in Sophon.
`ViewDescription` carries the defining query, the database unqualified
names in it resolve against, and the schema the query resolved to.
`create_view` returns one, so a caller has the schema without a second
call. There is no replace: changing a view is a drop and a create.
Querying a view stays SQL's job -- there are no rows behind it, so there
is no `open_view` returning a `Table`.