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Fixed #12234 -- Create additional indexes that use the appropriate operation class for PostgreSQL varchar and text columns when db_index=True.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@11912 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Justin Bronn
2009-12-19 08:19:38 +00:00
parent ca2d64788d
commit f1ea26dd99
2 changed files with 54 additions and 0 deletions
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15
docs/ref/databases.txt
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@@ -80,6 +80,21 @@ You should also audit your existing code for any instances of this behavior
before enabling this feature. It's faster, but it provides less automatic
protection for multi-call operations.
Indexes for ``varchar`` and ``text`` columns
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. versionadded:: 1.1.2
When specifying ``db_index=True`` on your model fields, Django typically
outputs a single ``CREATE INDEX`` statement. However, if the database type
for the field is either ``varchar`` or ``text`` (e.g., used by ``CharField``,
``FileField``, and ``TextField``), then Django will create
an additional index that uses an appropriate `PostgreSQL operator class`_
for the column. The extra index is necessary to correctly perfrom
lookups that use the ``LIKE`` operator in their SQL, as is done with the
``contains`` and ``startswith`` lookup types.
.. _PostgreSQL operator class: http://www.postgresql.org/docs/8.4/static/indexes-opclass.html
.. _mysql-notes:
MySQL notes