Fixed #28126 -- Added GistIndex to contrib.postgres.

Thanks to Marc Tamlyn for the initial patch.

3 files changed, 47 insertions, 0 deletions

diff --git a/docs/ref/contrib/postgres/indexes.txt b/docs/ref/contrib/postgres/indexes.txt
index d055a381c5..6e2a01210f 100644
--- a/docs/ref/contrib/postgres/indexes.txt
+++ b/docs/ref/contrib/postgres/indexes.txt
@@ -48,3 +48,35 @@ available from the ``django.contrib.postgres.indexes`` module.
     .. versionchanged:: 2.0
 
         The ``fastupdate`` and ``gin_pending_list_limit`` parameters were added.
+
+``GistIndex``
+=============
+
+.. class:: GistIndex(buffering=None, fillfactor=None, **options)
+
+    .. versionadded:: 2.0
+
+    Creates a `GiST index
+    <https://www.postgresql.org/docs/current/static/gist.html>`_. These indexes
+    are automatically created on spatial fields with :attr:`spatial_index=True
+    <django.contrib.gis.db.models.BaseSpatialField.spatial_index>`. They're
+    also useful on other types, such as
+    :class:`~django.contrib.postgres.fields.HStoreField` or the :ref:`range
+    fields <range-fields>`.
+
+    To use this index on data types not in the built-in `gist operator classes
+    <https://www.postgresql.org/docs/current/static/gist-builtin-opclasses.html>`_,
+    you need to activate the `btree_gist extension
+    <https://www.postgresql.org/docs/current/static/btree-gist.html>`_ on
+    PostgreSQL. You can install it using the
+    :class:`~django.contrib.postgres.operations.BtreeGistExtension` migration
+    operation.
+
+    Set the ``buffering`` parameter to ``True`` or ``False`` to manually enable
+    or disable `buffering build`_ of the index.
+
+    Provide an integer value from 10 to 100 to the fillfactor_ parameter to
+    tune how packed the index pages will be. PostgreSQL's default is 90.
+
+    .. _buffering build: https://www.postgresql.org/docs/current/static/gist-implementation.html#GIST-BUFFERING-BUILD
+    .. _fillfactor: https://www.postgresql.org/docs/current/static/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS
diff --git a/docs/ref/contrib/postgres/operations.txt b/docs/ref/contrib/postgres/operations.txt
index d984d9a3f7..c04704eeb5 100644
--- a/docs/ref/contrib/postgres/operations.txt
+++ b/docs/ref/contrib/postgres/operations.txt
@@ -58,6 +58,15 @@ run the query ``CREATE EXTENSION IF NOT EXISTS hstore;``.
 
     Install the ``btree_gin`` extension.
 
+``BtreeGistExtension``
+======================
+
+.. class:: BtreeGistExtension()
+
+    .. versionadded:: 2.0
+
+    Install the ``btree_gist`` extension.
+
 ``CITextExtension``
 ===================
 
diff --git a/docs/releases/2.0.txt b/docs/releases/2.0.txt
index 423f390433..4f92927c1e 100644
--- a/docs/releases/2.0.txt
+++ b/docs/releases/2.0.txt
@@ -117,6 +117,12 @@ Minor features
 * :class:`django.contrib.postgres.indexes.GinIndex` now supports the
   ``fastupdate`` and ``gin_pending_list_limit`` parameters.
 
+* The new :class:`~django.contrib.postgres.indexes.GistIndex` class allows
+  creating ``GiST`` indexes in the database. The new
+  :class:`~django.contrib.postgres.operations.BtreeGistExtension` migration
+  operation installs the ``btree_gist`` extension to add support for operator
+  classes that aren't built-in.
+
 :mod:`django.contrib.redirects`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~