pg_ivm 1.3 released

IVM Development Group is pleased to announce the release of [pg_ivm 1.3]( https://github.com/sraoss/pg_ivm/releases/tag/v1.3 ).

Changes since the v1.2 release include:

### New feature

* Add get_immv_def function (Takuma Hoshiai)

This function reconstructs the underlying SELECT command for an IMMV.

### Bug fixes

* Fix a maintenance failure of MIN/MAX aggregate views whose columns had alias names (Yugo Nagata)

Views that have a min/max aggregate with an alias name (e.g. `min(j) as min_j`) were not correctly handled and an error could be raised when a tuple was deleted from a base table.

* Fix possible incorrect maintenance due to XID wraparound or using sub-transactions (Yugo Nagata)

* Fix a bug that any table cannot be dropped by non-superuser (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)