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Two pages said list_materialized_views reads every table's schema and that SHOW MATERIALIZED VIEWS is cheaper. That is the local implementation; on a db:// connection the SDK asks the deployment for its views, as SHOW MATERIALIZED VIEWS does. The computed-column page now says that a literal must fit the column it meets, and that a deployment's refresh can fail on an expression reading a struct field, which the embedded library computes, so an expression for a deployment should use top-level columns.