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Add a note for create_immv in README.md

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With PostgreSQL 17 or later, while `refresh_immv` is running, 
the `search_path` is temporarily changed to `pg_catalog, pg_temp`.
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Yugo Nagata 2024-08-06 04:11:25 +09:00 committed by GitHub
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@ -92,6 +92,8 @@ create_immv(immv_name text, view_definition text) RETURNS bigint
When an IMMV is created, some triggers are automatically created so that the view's contents are immediately updated when its base tables are modified. In addition, a unique index is created on the IMMV automatically if possible. If the view definition query has a GROUP BY clause, a unique index is created on the columns of GROUP BY expressions. Also, if the view has DISTINCT clause, a unique index is created on all columns in the target list. Otherwise, if the IMMV contains all primary key attributes of its base tables in the target list, a unique index is created on these attributes. In other cases, no index is created.
Note that if you use PostgreSQL 17 or later, while `create_immv` is running, the `search_path` is temporarily changed to `pg_catalog, pg_temp`.
#### refresh_imm
Use `refresh_immv` function to refresh IMMV.