Fixed #27899 -- Added support for phrase/raw searching in SearchQuery.

Thanks Tim Graham, Nick Pope, and Claude Paroz for contribution and review.

docs/ref/contrib/postgres/search.txt

@@ -70,13 +70,28 @@ and ``weight`` parameters.
 ``SearchQuery``
 ===============
 
-.. class:: SearchQuery(value, config=None)
+.. class:: SearchQuery(value, config=None, search_type='plain')
 
 ``SearchQuery`` translates the terms the user provides into a search query
 object that the database compares to a search vector. By default, all the words
 the user provides are passed through the stemming algorithms, and then it
 looks for matches for all of the resulting terms.
 
+If ``search_type`` is ``'plain'``, which is the default, the terms are treated
+as separate keywords. If ``search_type`` is ``'phrase'``, the terms are treated
+as a single phrase. If ``search_type`` is ``'raw'``, then you can provide a
+formatted search query with terms and operators. Read PostgreSQL's `Full Text
+Search docs`_ to learn about differences and syntax. Examples:
+
+.. _Full Text Search docs: https://www.postgresql.org/docs/current/static/textsearch-controls.html#TEXTSEARCH-PARSING-QUERIES
+
+    >>> from django.contrib.postgres.search import SearchQuery
+    >>> SearchQuery('red tomato')  # two keywords
+    >>> SearchQuery('tomato red')  # same results as above
+    >>> SearchQuery('red tomato', search_type='phrase')  # a phrase
+    >>> SearchQuery('tomato red', search_type='phrase')  # a different phrase
+    >>> SearchQuery("'tomato' & ('red' | 'green')", search_type='raw')  # boolean operators
+
 ``SearchQuery`` terms can be combined logically to provide more flexibility::
 
     >>> from django.contrib.postgres.search import SearchQuery
@@ -87,6 +102,10 @@ looks for matches for all of the resulting terms.
 See :ref:`postgresql-fts-search-configuration` for an explanation of the
 ``config`` parameter.
 
+.. versionadded:: 2.2
+
+    The `search_type` parameter was added.
+
 ``SearchRank``
 ==============
 

docs/releases/2.2.txt

@@ -90,6 +90,10 @@ Minor features
 * :class:`~django.contrib.postgres.indexes.BrinIndex` now has the
   ``autosummarize`` parameter.
 
+* The new ``search_type`` parameter of
+  :class:`~django.contrib.postgres.search.SearchQuery` allows searching for
+  a phrase or raw expression.
+
 :mod:`django.contrib.redirects`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~