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We change the syntax for defining continuous aggregates to use `CREATE MATERIALIZED VIEW` rather than `CREATE VIEW`. The command still creates a view, while `CREATE MATERIALIZED VIEW` creates a table. Raise an error if `CREATE VIEW` is used to create a continuous aggregate and redirect to `CREATE MATERIALIZED VIEW`. In a similar vein, `DROP MATERIALIZED VIEW` is used for continuous aggregates and continuous aggregates cannot be dropped with `DROP VIEW`. Continuous aggregates are altered using `ALTER MATERIALIZED VIEW` rather than `ALTER VIEW`, so we ensure that it works for `ALTER MATERIALIZED VIEW` and gives an error if you try to use `ALTER VIEW` to change a continuous aggregate. Note that we allow `ALTER VIEW ... SET SCHEMA` to be used with the partial view as well as with the direct view, so this is handled as a special case. Fixes #2233 Co-authored-by: =?UTF-8?q?Erik=20Nordstr=C3=B6m?= <erik@timescale.com> Co-authored-by: Mats Kindahl <mats@timescale.com>