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docs: qualify what deployments do with materialized views
The SDK now sends CREATE MATERIALIZED VIEW and REFRESH MATERIALIZED VIEW to a db:// deployment as SQL, and refuses source_version on a remote refresh. Current Sophon source accepts both statements, with CASCADE and WITH (full = true), but only on deployments that enable materialized views, and whether a refresh rebuilds the view or reconciles changes depends on configuration. The pages said there is no CREATE MATERIALIZED VIEW statement, that refreshes are incremental by default and that CASCADE is not implemented. The refresh, management and SQL reference pages now describe what the SDK sends, say that materialized views are experimental and must be enabled on a deployment, and leave refresh behaviour, CASCADE and the job type to the deployment's version and configuration. The SQL and management summaries list CREATE MATERIALIZED VIEW. No deployment was exercised.
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@@ -99,7 +99,7 @@ insert -- see [What SQL cannot do](#cannot).
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| [Namespace](/sql/ddl/namespace) | `CREATE SCHEMA`, `DROP SCHEMA` |
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| [Table](/sql/ddl/table) | `CREATE`, `DESCRIBE`, `ALTER`, `CLONE`, `DROP TABLE` |
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| [View](/sql/ddl/view) | `CREATE VIEW`, `DROP VIEW` |
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| [Materialized view](/sql/ddl/materialized-view) | `SHOW MATERIALIZED VIEWS` |
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| [Materialized view](/sql/ddl/materialized-view) | `CREATE MATERIALIZED VIEW`, `SHOW MATERIALIZED VIEWS` |
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| [Index](/sql/ddl/index) | `CREATE INDEX`, `DROP INDEX` |
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| [Function](/sql/ddl/function) | `CREATE FUNCTION`, `SHOW FUNCTIONS`, `DROP FUNCTION` |
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| [Job](/sql/ddl/job) | `SHOW JOBS`, `SHOW ERRORS`, `PAUSE`/`RESUME`/`CANCEL JOB` |
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