pg_ivm 1.2 released

IVM Development Group is pleased to announce the release of [pg_ivm 1.2]( https://github.com/sraoss/pg_ivm/releases/tag/v1.2 ).

Changes since the v1.1 release include:

* Add support for PostgreSQL 15 (Takuma Hoshiai, Yugo Nagata)

* Add support for simple sub-queries in FROM clause (Takuma Hoshiai)

Simple sub-queries that do not contain DISTINCT or an aggregate function can be used in FROM clause. Sub-queries in a target-list or WHERE clause (including EXISTS sub-queries) are not allowed.

* Add support for built-in min and max aggregate functions (Yugo Nagata)

### About pg_ivm

pg_ivm is an extension module that provides Incremental View Maintenance (IVM) feature.

Incremental View Maintenance (IVM) is a way to make materialized views up-to-date in
which only incremental changes are computed and applied on views rather than recomputing.
pg_ivm provides a kind of immediate maintenance, in which materialized views are updated
immediately after a base table is modified.

Source repository: [https://github.com/sraoss/pg_ivm](https://github.com/sraoss/pg_ivm)