sqlalchemy-redshift

Amazon Redshift dialect for SQLAlchemy.

Installation

The package is available on PyPI::

pip install sqlalchemy-redshift

.. warning::

This dialect requires either ``redshift_connector`` or ``psycopg2``
to work properly. It does not provide
it as required, but relies on you to select the distribution you need:

* psycopg2 - standard distribution of psycopg2, requires compilation so few system dependencies are required for it
* psycopg2-binary - already compiled distribution (no system dependencies are required)
* psycopg2cffi - pypy compatible version

See `Psycopg2's binary install docs <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>`_
for more context on choosing a distribution.

Usage

The DSN format is similar to that of regular Postgres::

>>> import sqlalchemy as sa
>>> sa.create_engine('redshift+psycopg2://username@host.amazonaws.com:5439/database')
Engine(redshift+psycopg2://username@host.amazonaws.com:5439/database)

See the RedshiftDDLCompiler documentation <https://sqlalchemy-redshift.readthedocs.org/en/latest/ddl-compiler.html>_
for details on Redshift-specific features the dialect supports.

Running Tests

Tests are ran via tox and can be run with the following command::

$ tox

However, this will not run integration tests unless the following
environment variables are set:

REDSHIFT_HOST
REDSHIFT_PORT
REDSHIFT_USERNAME
PGPASSWORD (this is the redshift instance password)
REDSHIFT_DATABASE
REDSHIFT_IAM_ROLE_ARN

Note that the IAM role specified will need to be associated with
redshift cluster and have the correct permissions to create databases
and tables as well drop them. Exporting these environment variables in
your shell and running tox will run the integration tests against
a real redshift instance. Practice caution when running these tests
against a production instance.

Continuous Integration (CI)

Project CI is built using AWS CodePipeline and CloudFormation. Please see the ci/ folder and included README.txt
for details on how to spin up the project's CI.

Releasing

To perform a release, you will need to be an admin for the project on
GitHub and on PyPI. Contact the maintainers if you need that access.

You will need to have a ~/.pypirc with your PyPI credentials and
also the following settings::

[zest.releaser]
create-wheels = yes

To perform a release, run the following::

python -m venv ~/.virtualenvs/dist
workon dist
pip install -U pip setuptools wheel
pip install -U tox zest.releaser
fullrelease  # follow prompts, use semver ish with versions.

The releaser will handle updating version data on the package and in
CHANGES.rst along with tagging the repo and uploading to PyPI.

0.8.14 (2023-04-07)

Override new upstream postgres method that fails against redshift (Pull #266 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/266>_)
Fix table reflection broken for non-superusers
(Pull #276 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/276>_)
Fix Broken Reflection for 1.4 FutureEngine
(Pull #277 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/277>_)

0.8.13 (2023-03-28)

Add spectrum support
(Pull #263 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/263>_)
Drop support for Python 3.5

0.8.12 (2022-12-08)

Fix SQLAlchemy's "supports_statement_cache" (Pull #259 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/259>_)

0.8.11 (2022-07-27)

Disable redshift_connector dialect statement cache (Pull #257 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/257>_)

0.8.10 (2022-07-21)

Support HLLSKETCH Redshift datatypes
(Pull #246 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/246>_)
Disable supports_statement_cache
(Pull #249 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/249>_)
Fix doc, lint CI dependency issues
(Pull #250 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/250>_)
Fix redshift_connector dialect column encoding
(Pull #255 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/255>_)

0.8.9 (2021-12-15)

Support inspection of Redshift datatypes
(Pull #242 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/242>_)

0.8.8 (2021-11-03)

Remove support for Python 2.7; now requires python >=3.4
(Pull #234 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/234>_)
Support GEOMETRY, SUPER Redshift datatypes
(Pull #235 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/235>_)

0.8.7 (2021-10-27)

Initial SQLAlchemy 2.0.x support
(Pull #237 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/237>_)

0.8.6 (2021-09-22)

Add RedshiftDialect_redshift_connector
(Pull #232 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/232>_)
Create RedshiftDialectMixin class. Add RedshiftDialect_psycopg2cffi.
(Pull #231 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/231>_)

0.8.5 (2021-08-23)

Support TIMETZ datatype
(Pull #229 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/229>_)
Fix RelationKey unquoted issue
(Pull #228 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/228>_)

0.8.4 (2021-07-15)

Improve reflection performance by fetching/caching metadata per schema
rather than for the entire database
(Pull #223 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/223>_)

0.8.3 (2021-07-07)

SQLAlchemy 1.4.x support
(Pull #221 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/221>_)

0.8.2 (2021-01-08)

Allow supplying multiple role ARNs in COPY and UNLOAD commands. This allows
the first role to assume other roles as explained
here <https://docs.aws.amazon.com/redshift/latest/mgmt/authorizing-redshift-service.html#authorizing-redshift-service-chaining-roles>_.

0.8.1 (2020-07-15)

Support AWS partitions for role-based access control in COPY and UNLOAD
commands. This allows these commands to be used, e.g. in GovCloud.

0.8.0 (2020-06-30)

Add option to drop materialized view with CASCADE
(Pull #204 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/204>_)
Fix invalid SQLAlchemy version comparison
(Pull #206 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/206>_)

0.7.9 (2020-05-29)

Fix for supporting SQLAlchemy 1.3.11+
(Issue #195 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/195>_)

0.7.8 (2020-05-27)

Added support for materialized views
(Issue #202 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/202>_)
Fix reflection of unique constraints
(Issue #199 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/199>_)
Support for altering column comments in Alembic migrations
(Issue #191 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/191>_)

0.7.7 (2020-02-02)

Import Iterable from collections.abc for Python 3.9 compatibility
(Issue #189 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/189>_)
Add support for Parquet format in UNLOAD command
(Issue #187 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/187>_)

0.7.6 (2020-01-17)

Fix unhashable type error for sortkey reflection in SQLAlchemy >= 1.3.11
(Issue #180 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/180>_)
Expose supported types for import from the dialect
(Issue #181 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/181>_)
Reflect column comments
(Issue #186 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/186>_)

0.7.5 (2019-10-09)

Extend psycopg2 package version check to also support psycopg2-binary and psycopg2cffi
(Issue #178 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/178>_)

0.7.4 (2019-10-08)

Drop hard dependency on psycopg2 but require package to be present on runtime
(Issue #165 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/165>_)
Switch from info to keyword arguments on columns for SQLAlchemy >= 1.3.0
(Issue #161 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/161>_)
Add support for column info on redshift late binding views
(Issue #159 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/159>_)
Add support for MAXFILESIZE argument to UNLOAD.
(Issue #123 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/123>_)
Add support for the CREATE LIBRARY_ command.
(Issue #124 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/124>_)
Add support for the ALTER TABLE APPEND_ command.
(Issue #162 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/162>_)
Add support for the CSV format to UnloadFromSelect.
(Issue #169 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/169>_)
Update the list of reserved words (adds "az64" and "language")
(Issue #176 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/176>_)

.. _CREATE LIBRARY: https://docs.aws.amazon.com/redshift/latest/dg/r_CREATE_LIBRARY.html
.. _ALTER TABLE APPEND: https://docs.aws.amazon.com/redshift/latest/dg/r_ALTER_TABLE_APPEND.html

0.7.3 (2019-01-16)

Add support for REGION argument to COPY and UNLOAD commands.
(Issue #90 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/90>_)

0.7.2 (2018-12-11)

Update tests to adapt to changes in Redshift and SQLAlchemy
(Issue #140 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/140>_)
Add header option to UnloadFromSelect command
(Issue #156 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/156>_)
Add support for Parquet and ORC file formats in the COPY command
(Issue #151 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/150>_)
Add official support for Python 3.7
(Issue #153 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/153>_)
Avoid manipulating search path in table metadata fetch by using system tables
directly (Issue #147 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/147>_)

0.7.1 (2018-01-17)

Fix incompatibility of reflection code with SQLAlchemy 1.2.0+
(Issue #138 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/138>_)

0.7.0 (2017-10-03)

Do not enumerate search_path with external schemas (Issue #120 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/120>_)
Return constraint name from get_pk_constraint and get_foreign_keys
Use Enums for Format, Compression and Encoding.
Deprecate string parameters for these parameter types
(Issue #133 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/133>_)
Update included certificate with the transitional ACM cert bundle <https://docs.aws.amazon.com/redshift/latest/mgmt/connecting-transitioning-to-acm-certs.html>_
(Issue #130 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/130>_)

0.6.0 (2017-05-04)

Support role-based access control in COPY and UNLOAD commands
(Issue #88 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/88>_)
Increase max_identifier_length to 127 characters
(Issue #96 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/96>_)
Fix a bug where table names containing a period caused an error on reflection
(Issue #97 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/97>_)
Performance improvement for reflection by caching table constraint info
(Issue #101 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/101>_)
Support BZIP2 compression in COPY command
(Issue #110 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/110>_)
Allow tests to tolerate new default column encodings in Redshift
(Issue #114 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/114>_)
Pull in set of reserved words from Redshift docs
(Issue #94 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/94> _)

0.5.0 (2016-04-21)

Support reflecting tables with foriegn keys to tables in non-public schemas
(Issue #70 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/70>_)
Fix a bug where DISTKEY and SORTKEY could not be used on column names containing
spaces or commas. This is a breaking behavioral change for a command like
__table_args__ = {'redshift_sortkey': ('foo, bar')}. Previously, this would sort
on the columns named foo and bar. Now, it sorts on the column named foo, bar.
(Issue #74 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/74>_)

0.4.0 (2015-11-17)

Change the name of the package to sqlalchemy_redshift to match the naming
convention for other dialects; the redshift_sqlalchemy package now emits
a DeprecationWarning and references sqlalchemy_redshift.
The redshift_sqlalchemy compatibility package will be removed
in a future release.
(Issue #58 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/58>_)
Fix a bug where reflected tables could have incorrect column order for some
CREATE TABLE statements, particularly for columns with an IDENTITY
constraint.
(Issue #60 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/60>_)
Fix a bug where reflecting a table could raise a NoSuchTableError
in cases where its schema is not on the current search_path
(Issue #64 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/64>_)
Add python 3.5 to the list of versions for integration tests.
(Issue #61 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/61>_)

0.3.1 (2015-10-08)

Fix breakages to CopyCommand introduced in 0.3.0:
Thanks solackerman <https://github.com/solackerman>.
(Issue #53 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/53>)
- When format is omitted, no FORMAT AS ... is appended to the query. This
  makes the default the same as a normal redshift query.
- fix STATUPDATE as a COPY parameter

0.3.0 (2015-09-29)

Fix view support to be more in line with SQLAlchemy standards.
get_view_definition output no longer includes a trailing semicolon and
views no longer raise an exception when reflected as Table objects.
(Issue #46 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/46>_)
Rename RedShiftDDLCompiler to RedshiftDDLCompiler.
(Issue #43 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/43>_)
Update commands
(Issue #52 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/52>_)
- Expose optional TRUNCATECOLUMNS in CopyCommand.
- Add all other COPY parameters to CopyCommand.
- Move commands to their own module.
- Support inserts into ordered columns in CopyCommand.

0.2.0 (2015-09-04)

Use SYSDATE instead of NOW().
Thanks bouk <https://github.com/bouk>.
(Issue #15 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/15>)
Default to SSL with hardcoded AWS Redshift CA.
(Issue #20 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/20>_)
Refactor of CopyCommand including support for specifying format and
compression type. (Issue #21 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/21>_)
Explicitly require SQLAlchemy >= 0.9.2 for 'dialect_options'.
(Issue #13 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/13>_)
Refactor of UnloadFromSelect including support for specifying all documented
redshift options.
(Issue #27 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/27>_)
Fix unicode issue with SORTKEY on python 2.
(Issue #34 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/34>_)
Add support for Redshift DELETE statements that refer other tables in
the WHERE clause.
Thanks haleemur <https://github.com/haleemur>.
(Issue #35 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/35>)
Raise NoSuchTableError when trying to reflect a table that doesn't exist.
(Issue #38 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/38>_)

0.1.2 (2015-08-11)

Register postgresql.visit_rename_table for redshift's
alembic RenameTable.
Thanks bouk <https://github.com/bouk>.
(Issue #7 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/7>)

0.1.1 (2015-05-20)

Register RedshiftImpl as an alembic 3rd party dialect.

0.1.0 (2015-05-11)

First version of sqlalchemy-redshift that can be installed from PyPI

Dependencies of sqlalchemy-redshift (2).
Dependency	Optional
packaging	false
SQLAlchemy	false

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sqlalchemy-redshift

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