diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index a9fcd07c..7b6cc310 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -1,3 +1,3 @@
 docker:
-  image: gcr.io/repo-automation-bots/owlbot-python:latest
-  digest: sha256:9743664022bd63a8084be67f144898314c7ca12f0a03e422ac17c733c129d803
+  image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
+  digest: sha256:a3a85c2e0b3293068e47b1635b178f7e3d3845f2cfb8722de6713d4bbafdcd1d
diff --git a/.github/.OwlBot.yaml b/.github/.OwlBot.yaml
index 243bb8bf..3cbe64b8 100644
--- a/.github/.OwlBot.yaml
+++ b/.github/.OwlBot.yaml
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 docker:
-  image: gcr.io/repo-automation-bots/owlbot-python:latest
+  image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
 
 begin-after-commit-hash: be22498ce258bf2d5fe12fd696d3ad9a2b6c430e
 
diff --git a/.kokoro/build.sh b/.kokoro/build.sh
index b625604b..2a2874e5 100755
--- a/.kokoro/build.sh
+++ b/.kokoro/build.sh
@@ -41,7 +41,7 @@ python3 -m pip install --upgrade --quiet nox
 python3 -m nox --version
 
 # If this is a continuous build, send the test log to the FlakyBot.
-# See https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot.
+# See https://github.com/googleapis/repo-automation-bots/tree/main/packages/flakybot.
 if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"continuous"* ]]; then
   cleanup() {
     chmod +x $KOKORO_GFILE_DIR/linux_amd64/flakybot
diff --git a/.kokoro/test-samples-impl.sh b/.kokoro/test-samples-impl.sh
index 311a8d54..8a324c9c 100755
--- a/.kokoro/test-samples-impl.sh
+++ b/.kokoro/test-samples-impl.sh
@@ -80,7 +80,7 @@ for file in samples/**/requirements.txt; do
     EXIT=$?
 
     # If this is a periodic build, send the test log to the FlakyBot.
-    # See https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot.
+    # See https://github.com/googleapis/repo-automation-bots/tree/main/packages/flakybot.
     if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"periodic"* ]]; then
       chmod +x $KOKORO_GFILE_DIR/linux_amd64/flakybot
       $KOKORO_GFILE_DIR/linux_amd64/flakybot
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c4d72a6..74b032b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,18 @@ Older versions of this project were distributed as [pybigquery][0].
 [2]: https://pypi.org/project/pybigquery/#history
 
 
+## [1.2.0](https://www.github.com/googleapis/python-bigquery-sqlalchemy/compare/v1.1.0...v1.2.0) (2021-09-09)
+
+
+### Features
+
+* STRUCT and ARRAY support ([#318](https://www.github.com/googleapis/python-bigquery-sqlalchemy/issues/318)) ([6624b10](https://www.github.com/googleapis/python-bigquery-sqlalchemy/commit/6624b10ded73bbca6f40af73aaeaceb95c381b63))
+
+
+### Bug Fixes
+
+* the unnest function lost needed type information ([#298](https://www.github.com/googleapis/python-bigquery-sqlalchemy/issues/298)) ([1233182](https://www.github.com/googleapis/python-bigquery-sqlalchemy/commit/123318269876e7f76c7f0f2daa5f5b365026cd3f))
+
 ## [1.1.0](https://www.github.com/googleapis/python-bigquery-sqlalchemy/compare/v1.0.0...v1.1.0) (2021-08-25)
 
 
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index b6278e10..779aa5a1 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -50,9 +50,9 @@ You'll have to create a development environment using a Git checkout:
    # Configure remotes such that you can pull changes from the googleapis/python-bigquery-sqlalchemy
    # repository into your local repository.
    $ git remote add upstream git@github.com:googleapis/python-bigquery-sqlalchemy.git
-   # fetch and merge changes from upstream into master
+   # fetch and merge changes from upstream into main
    $ git fetch upstream
-   $ git merge upstream/master
+   $ git merge upstream/main
 
 Now your local repo is set up such that you will push changes to your GitHub
 repo, from which you can submit a pull request.
@@ -110,12 +110,12 @@ Coding Style
   variables::
 
    export GOOGLE_CLOUD_TESTING_REMOTE="upstream"
-   export GOOGLE_CLOUD_TESTING_BRANCH="master"
+   export GOOGLE_CLOUD_TESTING_BRANCH="main"
 
   By doing this, you are specifying the location of the most up-to-date
-  version of ``python-bigquery-sqlalchemy``. The the suggested remote name ``upstream``
-  should point to the official ``googleapis`` checkout and the
-  the branch should be the main branch on that remote (``master``).
+  version of ``python-bigquery-sqlalchemy``. The
+  remote name ``upstream`` should point to the official ``googleapis``
+  checkout and the branch should be the default branch on that remote (``main``).
 
 - This repository contains configuration for the
   `pre-commit <https://pre-commit.com/>`__ tool, which automates checking
@@ -209,7 +209,7 @@ The `description on PyPI`_ for the project comes directly from the
 ``README``. Due to the reStructuredText (``rst``) parser used by
 PyPI, relative links which will work on GitHub (e.g. ``CONTRIBUTING.rst``
 instead of
-``https://github.com/googleapis/python-bigquery-sqlalchemy/blob/master/CONTRIBUTING.rst``)
+``https://github.com/googleapis/python-bigquery-sqlalchemy/blob/main/CONTRIBUTING.rst``)
 may cause problems creating links or rendering the description.
 
 .. _description on PyPI: https://pypi.org/project/sqlalchemy-bigquery
@@ -234,7 +234,7 @@ We support:
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
 
-.. _config: https://github.com/googleapis/python-bigquery-sqlalchemy/blob/master/noxfile.py
+.. _config: https://github.com/googleapis/python-bigquery-sqlalchemy/blob/main/noxfile.py
 
 
 We also explicitly decided to support Python 3 beginning with version 3.6.
diff --git a/README.rst b/README.rst
index 56e64921..9b76eab6 100644
--- a/README.rst
+++ b/README.rst
@@ -9,7 +9,7 @@ SQLAlchemy Dialect for BigQuery
 - `Product Documentation`_
 
 .. |GA| image:: https://img.shields.io/badge/support-GA-gold.svg
-   :target: https://github.com/googleapis/google-cloud-python/blob/master/README.rst#general-availability
+   :target: https://github.com/googleapis/google-cloud-python/blob/main/README.rst#general-availability
 .. |pypi| image:: https://img.shields.io/pypi/v/sqlalchemy-bigquery.svg
    :target: https://pypi.org/project/sqlalchemy-bigquery/
 .. |versions| image:: https://img.shields.io/pypi/pyversions/sqlalchemy-bigquery.svg
diff --git a/dev_requirements.txt b/dev_requirements.txt
index 036eedd7..a092f5b0 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -2,6 +2,6 @@ sqlalchemy>=1.1.9
 google-cloud-bigquery>=1.6.0
 future==0.18.2
 
-pytest==6.2.4
+pytest==6.2.5
 pytest-flake8==1.0.7
 pytz==2021.1
\ No newline at end of file
diff --git a/docs/alembic.rst b/docs/alembic.rst
index e83953a0..8b5df741 100644
--- a/docs/alembic.rst
+++ b/docs/alembic.rst
@@ -43,7 +43,7 @@ Supported operations:
 <https://alembic.sqlalchemy.org/en/latest/ops.html#alembic.operations.Operations.rename_table>`_
 
 Note that some of the operations above have limited capability, again
-do to `BigQuery limitations
+due to `BigQuery limitations
 <https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language>`_.
 
 The `execute` operation allows access to BigQuery-specific
diff --git a/docs/conf.py b/docs/conf.py
index 6e45e97c..620d2a06 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -76,8 +76,8 @@
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'
 
-# The master toctree document.
-master_doc = "index"
+# The root toctree document.
+root_doc = "index"
 
 # General information about the project.
 project = "sqlalchemy-bigquery"
@@ -280,7 +280,7 @@
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
     (
-        master_doc,
+        root_doc,
         "sqlalchemy-bigquery.tex",
         "sqlalchemy-bigquery Documentation",
         author,
@@ -314,13 +314,7 @@
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    (
-        master_doc,
-        "sqlalchemy-bigquery",
-        "sqlalchemy-bigquery Documentation",
-        [author],
-        1,
-    )
+    (root_doc, "sqlalchemy-bigquery", "sqlalchemy-bigquery Documentation", [author], 1,)
 ]
 
 # If true, show URL addresses after external links.
@@ -334,7 +328,7 @@
 #  dir menu entry, description, category)
 texinfo_documents = [
     (
-        master_doc,
+        root_doc,
         "sqlalchemy-bigquery",
         "sqlalchemy-bigquery Documentation",
         author,
diff --git a/docs/index.rst b/docs/index.rst
index 4fe42891..c70b2d2f 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -3,6 +3,7 @@
    :maxdepth: 2
 
    README
+   struct
    geography
    alembic
    reference
diff --git a/docs/struct.rst b/docs/struct.rst
new file mode 100644
index 00000000..9b2d5724
--- /dev/null
+++ b/docs/struct.rst
@@ -0,0 +1,69 @@
+Working with BigQuery STRUCT data
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The BigQuery `STRUCT data type
+<https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#struct_type>`_
+provided data that are collections of named fields.
+
+`sqlalchemy-bigquery` provided a STRUCT type that can be used to
+define tables with STRUCT columns:
+
+.. literalinclude:: samples/snippets/STRUCT.py
+   :language: python
+   :dedent: 4
+   :start-after: [START bigquery_sqlalchemy_create_table_with_struct]
+   :end-before: [END bigquery_sqlalchemy_create_table_with_struct]
+
+`STRUCT` types can be nested, as in this example.  Struct fields can
+be defined in two ways:
+
+- Fields can be provided as keyword arguments, as in the `cylinder`
+  and `horsepower` fields in this example.
+
+- Fields can be provided as name-type tuples provided as positional
+  arguments, as with the `count` and `compression` fields in this example.
+
+STRUCT columns are automatically created when existing database tables
+containing STRUCT columns are introspected.
+
+Struct data are represented in Python as Python dictionaries:
+
+.. literalinclude:: samples/snippets/STRUCT.py
+   :language: python
+   :dedent: 4
+   :start-after: [START bigquery_sqlalchemy_insert_struct]
+   :end-before: [END bigquery_sqlalchemy_insert_struct]
+
+When querying struct fields, you can use attribute access syntax:
+
+.. literalinclude:: samples/snippets/STRUCT.py
+   :language: python
+   :dedent: 4
+   :start-after: [START bigquery_sqlalchemy_query_struct]
+   :end-before: [END bigquery_sqlalchemy_query_struct]
+
+or mapping access:
+
+.. literalinclude:: samples/snippets/STRUCT.py
+   :language: python
+   :dedent: 4
+   :start-after: [START bigquery_sqlalchemy_query_getitem]
+   :end-before: [END bigquery_sqlalchemy_query_getitem]
+
+and field names are case insensitive:
+
+.. literalinclude:: samples/snippets/STRUCT.py
+   :language: python
+   :dedent: 4
+   :start-after: [START bigquery_sqlalchemy_query_STRUCT]
+   :end-before: [END bigquery_sqlalchemy_query_STRUCT]
+
+When using attribute-access syntax, field names may conflict with
+column attribute names.  For example SQLAlchemy columns have `name`
+and `type` attributes, among others.  When accessing a field whose name
+conflicts with a column attribute name, either use mapping access, or
+spell the field name with upper-case letters.
+
+
+
+
diff --git a/owlbot.py b/owlbot.py
index b6cfe7ff..dcec1b04 100644
--- a/owlbot.py
+++ b/owlbot.py
@@ -172,7 +172,6 @@ def compliance(session):
 
 
 # Add DB config for SQLAlchemy dialect test suite.
-# https://github.com/sqlalchemy/sqlalchemy/blob/master/README.dialects.rst
 # https://github.com/googleapis/python-bigquery-sqlalchemy/issues/89
 s.replace(
     ["setup.cfg"],
diff --git a/release-procedure.md b/release-procedure.md
index ba5291dd..c3d68f31 100644
--- a/release-procedure.md
+++ b/release-procedure.md
@@ -1,10 +1,10 @@
 # sqlalchemy-bigquery release procedure
 
-*   Checkout master branch
+*   Checkout main branch
 
-        git fetch upstream master
-        git checkout master
-        git rebase -i upstream/master
+        git fetch upstream main
+        git checkout main
+        git rebase -i upstream/main
 
 *   Update version number in `setup.py`
 
@@ -13,7 +13,7 @@
 *   Commit and push
 
         git commit -m "Release x.x.x"
-        git push upstream master
+        git push upstream main
 
 *   Build the package
 
diff --git a/renovate.json b/renovate.json
index c0489556..c21036d3 100644
--- a/renovate.json
+++ b/renovate.json
@@ -1,6 +1,9 @@
 {
   "extends": [
-    "config:base",  ":preserveSemverRanges"
+    "config:base",
+    "group:all",
+    ":preserveSemverRanges",
+    ":disableDependencyDashboard"
   ],
   "ignorePaths": [".pre-commit-config.yaml"],
   "pip_requirements": {
diff --git a/samples/snippets/STRUCT.py b/samples/snippets/STRUCT.py
new file mode 100644
index 00000000..ce59f90b
--- /dev/null
+++ b/samples/snippets/STRUCT.py
@@ -0,0 +1,90 @@
+# Copyright (c) 2021 The sqlalchemy-bigquery Authors
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+def example(engine):
+    # fmt: off
+    # [START bigquery_sqlalchemy_create_table_with_struct]
+    from sqlalchemy.ext.declarative import declarative_base
+    from sqlalchemy import Column, String, Integer, Float
+    from sqlalchemy_bigquery import STRUCT
+
+    Base = declarative_base()
+
+    class Car(Base):
+        __tablename__ = "Cars"
+
+        model = Column(String, primary_key=True)
+        engine = Column(
+            STRUCT(
+                cylinder=STRUCT(("count", Integer),
+                                ("compression", Float)),
+                horsepower=Integer)
+            )
+
+    # [END bigquery_sqlalchemy_create_table_with_struct]
+    Car.__table__.create(engine)
+
+    # [START bigquery_sqlalchemy_insert_struct]
+    from sqlalchemy.orm import sessionmaker
+
+    Session = sessionmaker(bind=engine)
+    session = Session()
+
+    sebring = Car(model="Sebring",
+                  engine=dict(
+                      cylinder=dict(
+                          count=6,
+                          compression=18.0),
+                      horsepower=235))
+    townc = Car(model="Town and Counttry",
+                engine=dict(
+                    cylinder=dict(
+                        count=6,
+                        compression=16.0),
+                    horsepower=251))
+    xj8 = Car(model="XJ8",
+              engine=dict(
+                  cylinder=dict(
+                      count=8,
+                      compression=10.75),
+                  horsepower=575))
+
+    session.add_all((sebring, townc, xj8))
+    session.commit()
+
+    # [END bigquery_sqlalchemy_insert_struct]
+
+    # [START bigquery_sqlalchemy_query_struct]
+    sixes = session.query(Car).filter(Car.engine.cylinder.count == 6)
+    # [END bigquery_sqlalchemy_query_struct]
+    sixes1 = list(sixes)
+
+    # [START bigquery_sqlalchemy_query_STRUCT]
+    sixes = session.query(Car).filter(Car.engine.CYLINDER.COUNT == 6)
+    # [END bigquery_sqlalchemy_query_STRUCT]
+    sixes2 = list(sixes)
+
+    # [START bigquery_sqlalchemy_query_getitem]
+    sixes = session.query(Car).filter(Car.engine["cylinder"]["count"] == 6)
+    # [END bigquery_sqlalchemy_query_getitem]
+    # fmt: on
+    sixes3 = list(sixes)
+
+    return sixes1, sixes2, sixes3
diff --git a/samples/snippets/STRUCT_test.py b/samples/snippets/STRUCT_test.py
new file mode 100644
index 00000000..5a5c6515
--- /dev/null
+++ b/samples/snippets/STRUCT_test.py
@@ -0,0 +1,27 @@
+# Copyright (c) 2021 The sqlalchemy-bigquery Authors
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+def test_struct(engine):
+    from . import STRUCT
+
+    sixeses = STRUCT.example(engine)
+
+    for sixes in sixeses:
+        assert sorted(car.model for car in sixes) == ["Sebring", "Town and Counttry"]
diff --git a/samples/snippets/test_geography.py b/samples/snippets/geography_test.py
similarity index 100%
rename from samples/snippets/test_geography.py
rename to samples/snippets/geography_test.py
diff --git a/samples/snippets/requirements-test.txt b/samples/snippets/requirements-test.txt
index d51249fe..1d27f79b 100644
--- a/samples/snippets/requirements-test.txt
+++ b/samples/snippets/requirements-test.txt
@@ -1,12 +1,12 @@
 attrs==21.2.0
-google-cloud-testutils==1.0.0
-importlib-metadata==4.6.4
+google-cloud-testutils==1.1.0
+importlib-metadata==4.8.1
 iniconfig==1.1.1
 packaging==21.0
-pluggy==0.13.1
+pluggy==1.0.0
 py==1.10.0
 pyparsing==2.4.7
-pytest==6.2.4
+pytest==6.2.5
 toml==0.10.2
-typing-extensions==3.10.0.0
+typing-extensions==3.10.0.2
 zipp==3.5.0
diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index 50a070fb..78b9ee50 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -9,33 +9,33 @@ click-plugins==1.1.1
 cligj==0.7.2
 contextvars==2.4
 dataclasses==0.6; python_version < '3.7'
-Deprecated==1.2.12
+Deprecated==1.2.13
 Fiona==1.8.20
 future==0.18.2
-GeoAlchemy2==0.9.3
+GeoAlchemy2==0.9.4
 geopandas==0.9.0
-google-api-core==2.0.0
-google-auth==2.0.1
-google-cloud-bigquery==2.24.1
-google-cloud-bigquery-storage==2.6.3
+google-api-core==2.0.1
+google-auth==2.0.2
+google-cloud-bigquery==2.26.0
+google-cloud-bigquery-storage==2.7.0
 google-cloud-core==2.0.0
 google-crc32c==1.1.2
-google-resumable-media==2.0.0
+google-resumable-media==2.0.2
 googleapis-common-protos==1.53.0
 greenlet==1.1.1
-grpcio==1.39.0
+grpcio==1.40.0
 idna==3.2
 immutables==0.16
-importlib-metadata==4.6.4
+importlib-metadata==4.8.1
 libcst==0.3.20
 munch==2.5.0
 mypy-extensions==0.4.3
 numpy==1.19.5; python_version < '3.7'
 numpy==1.21.2; python_version >= '3.7'
-opentelemetry-api==1.4.1
-opentelemetry-instrumentation==0.23b2
-opentelemetry-sdk==1.4.1
-opentelemetry-semantic-conventions==0.23b2
+opentelemetry-api==1.5.0
+opentelemetry-instrumentation==0.24b0
+opentelemetry-sdk==1.5.0
+opentelemetry-semantic-conventions==0.24b0
 packaging==21.0
 pandas==1.1.5; python_version < '3.7'
 pandas==1.3.2; python_version >= '3.7'
@@ -56,9 +56,9 @@ rsa==4.7.2
 Shapely==1.7.1
 six==1.16.0
 SQLAlchemy==1.4.23
-sqlalchemy-bigquery==1.0.0
+sqlalchemy-bigquery==1.1.0
 tqdm==4.62.2
-typing-extensions==3.10.0.0
+typing-extensions==3.10.0.2
 typing-inspect==0.7.1
 urllib3==1.26.6
 wrapt==1.12.1
diff --git a/setup.py b/setup.py
index f70c3a0d..7efe0f9b 100644
--- a/setup.py
+++ b/setup.py
@@ -83,7 +83,7 @@ def readme():
         # Until this issue is closed
         # https://github.com/googleapis/google-cloud-python/issues/10566
         "google-auth>=1.25.0,<3.0.0dev",  # Work around pip wack.
-        "google-cloud-bigquery>=2.24.1",
+        "google-cloud-bigquery>=2.25.2,<3.0.0dev",
         "sqlalchemy>=1.2.0,<1.5.0dev",
         "future",
     ],
diff --git a/sqlalchemy_bigquery/__init__.py b/sqlalchemy_bigquery/__init__.py
index f0defda1..f0d8a6c6 100644
--- a/sqlalchemy_bigquery/__init__.py
+++ b/sqlalchemy_bigquery/__init__.py
@@ -23,7 +23,7 @@
 from .version import __version__  # noqa
 
 from .base import BigQueryDialect, dialect  # noqa
-from .base import (
+from ._types import (
     ARRAY,
     BIGNUMERIC,
     BOOL,
@@ -38,6 +38,7 @@
     NUMERIC,
     RECORD,
     STRING,
+    STRUCT,
     TIME,
     TIMESTAMP,
 )
@@ -58,6 +59,7 @@
     "NUMERIC",
     "RECORD",
     "STRING",
+    "STRUCT",
     "TIME",
     "TIMESTAMP",
 ]
diff --git a/sqlalchemy_bigquery/_struct.py b/sqlalchemy_bigquery/_struct.py
new file mode 100644
index 00000000..a3d9aba4
--- /dev/null
+++ b/sqlalchemy_bigquery/_struct.py
@@ -0,0 +1,148 @@
+# Copyright (c) 2021 The sqlalchemy-bigquery Authors
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+from typing import Mapping, Tuple
+
+import packaging.version
+import sqlalchemy.sql.default_comparator
+import sqlalchemy.sql.sqltypes
+import sqlalchemy.types
+
+from . import base
+
+sqlalchemy_1_4_or_more = packaging.version.parse(
+    sqlalchemy.__version__
+) >= packaging.version.parse("1.4")
+
+if sqlalchemy_1_4_or_more:
+    import sqlalchemy.sql.coercions
+    import sqlalchemy.sql.roles
+
+
+def _get_subtype_col_spec(type_):
+    global _get_subtype_col_spec
+
+    type_compiler = base.dialect.type_compiler(base.dialect())
+    _get_subtype_col_spec = type_compiler.process
+    return _get_subtype_col_spec(type_)
+
+
+class STRUCT(sqlalchemy.sql.sqltypes.Indexable, sqlalchemy.types.UserDefinedType):
+    """
+    A type for BigQuery STRUCT/RECORD data
+
+    See https://googleapis.dev/python/sqlalchemy-bigquery/latest/struct.html
+    """
+
+    # See https://docs.sqlalchemy.org/en/14/core/custom_types.html#creating-new-types
+
+    def __init__(
+        self,
+        *fields: Tuple[str, sqlalchemy.types.TypeEngine],
+        **kwfields: Mapping[str, sqlalchemy.types.TypeEngine],
+    ):
+        # Note that because:
+        # https://docs.python.org/3/whatsnew/3.6.html#pep-468-preserving-keyword-argument-order
+        # We know that `kwfields` preserves order.
+        self._STRUCT_fields = tuple(
+            (
+                name,
+                type_ if isinstance(type_, sqlalchemy.types.TypeEngine) else type_(),
+            )
+            for (name, type_) in (fields + tuple(kwfields.items()))
+        )
+
+        self._STRUCT_byname = {
+            name.lower(): type_ for (name, type_) in self._STRUCT_fields
+        }
+
+    def __repr__(self):
+        fields = ", ".join(
+            f"{name}={repr(type_)}" for name, type_ in self._STRUCT_fields
+        )
+        return f"STRUCT({fields})"
+
+    def get_col_spec(self, **kw):
+        fields = ", ".join(
+            f"{name} {_get_subtype_col_spec(type_)}"
+            for name, type_ in self._STRUCT_fields
+        )
+        return f"STRUCT<{fields}>"
+
+    def bind_processor(self, dialect):
+        return dict
+
+    class Comparator(sqlalchemy.sql.sqltypes.Indexable.Comparator):
+        def _setup_getitem(self, name):
+            if not isinstance(name, str):
+                raise TypeError(
+                    f"STRUCT fields can only be accessed with strings field names,"
+                    f" not {repr(name)}."
+                )
+            subtype = self.expr.type._STRUCT_byname.get(name.lower())
+            if subtype is None:
+                raise KeyError(name)
+            operator = struct_getitem_op
+            index = _field_index(self, name, operator)
+            return operator, index, subtype
+
+        def __getattr__(self, name):
+            if name.lower() in self.expr.type._STRUCT_byname:
+                return self[name]
+
+    comparator_factory = Comparator
+
+
+# In the implementations of _field_index below, we're stealing from
+# the JSON type implementation, but the code to steal changed in
+# 1.4. :/
+
+if sqlalchemy_1_4_or_more:
+
+    def _field_index(self, name, operator):
+        return sqlalchemy.sql.coercions.expect(
+            sqlalchemy.sql.roles.BinaryElementRole,
+            name,
+            expr=self.expr,
+            operator=operator,
+            bindparam_type=sqlalchemy.types.String(),
+        )
+
+
+else:
+
+    def _field_index(self, name, operator):
+        return sqlalchemy.sql.default_comparator._check_literal(
+            self.expr, operator, name, bindparam_type=sqlalchemy.types.String(),
+        )
+
+
+def struct_getitem_op(a, b):
+    raise NotImplementedError()
+
+
+sqlalchemy.sql.default_comparator.operator_lookup[
+    struct_getitem_op.__name__
+] = sqlalchemy.sql.default_comparator.operator_lookup["json_getitem_op"]
+
+
+class SQLCompiler:
+    def visit_struct_getitem_op_binary(self, binary, operator_, **kw):
+        left = self.process(binary.left, **kw)
+        return f"{left}.{binary.right.value}"
diff --git a/sqlalchemy_bigquery/_types.py b/sqlalchemy_bigquery/_types.py
new file mode 100644
index 00000000..4e18dc2a
--- /dev/null
+++ b/sqlalchemy_bigquery/_types.py
@@ -0,0 +1,141 @@
+# Copyright (c) 2021 The sqlalchemy-bigquery Authors
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import sqlalchemy.types
+import sqlalchemy.util
+
+from google.cloud.bigquery.schema import SchemaField
+
+try:
+    from .geography import GEOGRAPHY
+except ImportError:
+    pass
+
+from ._struct import STRUCT
+
+_type_map = {
+    "ARRAY": sqlalchemy.types.ARRAY,
+    "BIGNUMERIC": sqlalchemy.types.Numeric,
+    "BOOLEAN": sqlalchemy.types.Boolean,
+    "BOOL": sqlalchemy.types.Boolean,
+    "BYTES": sqlalchemy.types.BINARY,
+    "DATETIME": sqlalchemy.types.DATETIME,
+    "DATE": sqlalchemy.types.DATE,
+    "FLOAT64": sqlalchemy.types.Float,
+    "FLOAT": sqlalchemy.types.Float,
+    "INT64": sqlalchemy.types.Integer,
+    "INTEGER": sqlalchemy.types.Integer,
+    "NUMERIC": sqlalchemy.types.Numeric,
+    "RECORD": STRUCT,
+    "STRING": sqlalchemy.types.String,
+    "STRUCT": STRUCT,
+    "TIMESTAMP": sqlalchemy.types.TIMESTAMP,
+    "TIME": sqlalchemy.types.TIME,
+}
+
+# By convention, dialect-provided types are spelled with all upper case.
+ARRAY = _type_map["ARRAY"]
+BIGNUMERIC = _type_map["NUMERIC"]
+BOOLEAN = _type_map["BOOLEAN"]
+BOOL = _type_map["BOOL"]
+BYTES = _type_map["BYTES"]
+DATETIME = _type_map["DATETIME"]
+DATE = _type_map["DATE"]
+FLOAT64 = _type_map["FLOAT64"]
+FLOAT = _type_map["FLOAT"]
+INT64 = _type_map["INT64"]
+INTEGER = _type_map["INTEGER"]
+NUMERIC = _type_map["NUMERIC"]
+RECORD = _type_map["RECORD"]
+STRING = _type_map["STRING"]
+TIMESTAMP = _type_map["TIMESTAMP"]
+TIME = _type_map["TIME"]
+
+try:
+    _type_map["GEOGRAPHY"] = GEOGRAPHY
+except NameError:
+    pass
+
+STRUCT_FIELD_TYPES = "RECORD", "STRUCT"
+
+
+def _get_transitive_schema_fields(fields):
+    """
+    Recurse into record type and return all the nested field names.
+    As contributed by @sumedhsakdeo on issue #17
+    """
+    results = []
+    for field in fields:
+        results += [field]
+        if field.field_type in STRUCT_FIELD_TYPES:
+            sub_fields = [
+                SchemaField.from_api_repr(
+                    dict(f.to_api_repr(), name=f"{field.name}.{f.name}")
+                )
+                for f in field.fields
+            ]
+            results += _get_transitive_schema_fields(sub_fields)
+    return results
+
+
+def _get_sqla_column_type(field):
+    try:
+        coltype = _type_map[field.field_type]
+    except KeyError:
+        sqlalchemy.util.warn(
+            "Did not recognize type '%s' of column '%s'"
+            % (field.field_type, field.name)
+        )
+        coltype = sqlalchemy.types.NullType
+    else:
+        if field.field_type.endswith("NUMERIC"):
+            coltype = coltype(precision=field.precision, scale=field.scale)
+        elif field.field_type == "STRING" or field.field_type == "BYTES":
+            coltype = coltype(field.max_length)
+        elif field.field_type == "RECORD" or field.field_type == "STRUCT":
+            coltype = STRUCT(
+                *(
+                    (subfield.name, _get_sqla_column_type(subfield))
+                    for subfield in field.fields
+                )
+            )
+        else:
+            coltype = coltype()
+
+    if field.mode == "REPEATED":
+        coltype = ARRAY(coltype)
+
+    return coltype
+
+
+def get_columns(bq_schema):
+    fields = _get_transitive_schema_fields(bq_schema)
+    return [
+        {
+            "name": field.name,
+            "type": _get_sqla_column_type(field),
+            "nullable": field.mode == "NULLABLE" or field.mode == "REPEATED",
+            "comment": field.description,
+            "default": None,
+            "precision": field.precision,
+            "scale": field.scale,
+            "max_length": field.max_length,
+        }
+        for field in fields
+    ]
diff --git a/sqlalchemy_bigquery/base.py b/sqlalchemy_bigquery/base.py
index e4f86e7b..f5b1d515 100644
--- a/sqlalchemy_bigquery/base.py
+++ b/sqlalchemy_bigquery/base.py
@@ -30,15 +30,16 @@
 from google import auth
 import google.api_core.exceptions
 from google.cloud.bigquery import dbapi
-from google.cloud.bigquery.schema import SchemaField
 from google.cloud.bigquery.table import TableReference
 from google.api_core.exceptions import NotFound
 
 import sqlalchemy
+import sqlalchemy.sql.expression
+import sqlalchemy.sql.functions
 import sqlalchemy.sql.sqltypes
 import sqlalchemy.sql.type_api
 from sqlalchemy.exc import NoSuchTableError
-from sqlalchemy import types, util
+from sqlalchemy import util
 from sqlalchemy.sql.compiler import (
     SQLCompiler,
     GenericTypeCompiler,
@@ -53,12 +54,7 @@
 import re
 
 from .parse_url import parse_url
-from sqlalchemy_bigquery import _helpers
-
-try:
-    from .geography import GEOGRAPHY
-except ImportError:
-    pass
+from . import _helpers, _struct, _types
 
 FIELD_ILLEGAL_CHARACTERS = re.compile(r"[^\w]+")
 
@@ -115,49 +111,6 @@ def format_label(self, label, name=None):
         return result
 
 
-_type_map = {
-    "ARRAY": types.ARRAY,
-    "BIGNUMERIC": types.Numeric,
-    "BOOLEAN": types.Boolean,
-    "BOOL": types.Boolean,
-    "BYTES": types.BINARY,
-    "DATETIME": types.DATETIME,
-    "DATE": types.DATE,
-    "FLOAT64": types.Float,
-    "FLOAT": types.Float,
-    "INT64": types.Integer,
-    "INTEGER": types.Integer,
-    "NUMERIC": types.Numeric,
-    "RECORD": types.JSON,
-    "STRING": types.String,
-    "TIMESTAMP": types.TIMESTAMP,
-    "TIME": types.TIME,
-}
-
-# By convention, dialect-provided types are spelled with all upper case.
-ARRAY = _type_map["ARRAY"]
-BIGNUMERIC = _type_map["NUMERIC"]
-BOOLEAN = _type_map["BOOLEAN"]
-BOOL = _type_map["BOOL"]
-BYTES = _type_map["BYTES"]
-DATETIME = _type_map["DATETIME"]
-DATE = _type_map["DATE"]
-FLOAT64 = _type_map["FLOAT64"]
-FLOAT = _type_map["FLOAT"]
-INT64 = _type_map["INT64"]
-INTEGER = _type_map["INTEGER"]
-NUMERIC = _type_map["NUMERIC"]
-RECORD = _type_map["RECORD"]
-STRING = _type_map["STRING"]
-TIMESTAMP = _type_map["TIMESTAMP"]
-TIME = _type_map["TIME"]
-
-try:
-    _type_map["GEOGRAPHY"] = GEOGRAPHY
-except NameError:
-    pass
-
-
 class BigQueryExecutionContext(DefaultExecutionContext):
     def create_cursor(self):
         # Set arraysize
@@ -225,7 +178,7 @@ def pre_exec(self):
         )
 
 
-class BigQueryCompiler(SQLCompiler):
+class BigQueryCompiler(_struct.SQLCompiler, SQLCompiler):
 
     compound_keywords = SQLCompiler.compound_keywords.copy()
     compound_keywords[selectable.CompoundSelect.UNION] = "UNION DISTINCT"
@@ -541,9 +494,6 @@ def visit_bindparam(
                 type_.scale = -t.exponent
 
         bq_type = self.dialect.type_compiler.process(type_)
-        if bq_type[-1] == ">" and bq_type.startswith("ARRAY<"):
-            # Values get arrayified at a lower level.
-            bq_type = bq_type[6:-1]
         bq_type = self.__remove_type_parameter(bq_type)
 
         assert_(param != "%s", f"Unexpected param: {param}")
@@ -564,6 +514,11 @@ def visit_bindparam(
 
         return param
 
+    def visit_getitem_binary(self, binary, operator_, **kw):
+        left = self.process(binary.left, **kw)
+        right = self.process(binary.right, **kw)
+        return f"{left}[OFFSET({right})]"
+
 
 class BigQueryTypeCompiler(GenericTypeCompiler):
     def visit_INTEGER(self, type_, **kw):
@@ -834,14 +789,6 @@ def create_connect_args(self, url):
         )
         return ([client], {})
 
-    def _json_deserializer(self, row):
-        """JSON deserializer for RECORD types.
-
-        The DB-API layer already deserializes JSON to a dictionary, so this
-        just returns the input.
-        """
-        return row
-
     def _get_table_or_view_names(self, connection, table_type, schema=None):
         current_schema = schema or self.dataset_id
         get_table_name = (
@@ -966,59 +913,9 @@ def has_table(self, connection, table_name, schema=None):
         except NoSuchTableError:
             return False
 
-    def _get_columns_helper(self, columns, cur_columns):
-        """
-        Recurse into record type and return all the nested field names.
-        As contributed by @sumedhsakdeo on issue #17
-        """
-        results = []
-        for col in columns:
-            results += [col]
-            if col.field_type == "RECORD":
-                cur_columns.append(col)
-                fields = [
-                    SchemaField.from_api_repr(
-                        dict(f.to_api_repr(), name=f"{col.name}.{f.name}")
-                    )
-                    for f in col.fields
-                ]
-                results += self._get_columns_helper(fields, cur_columns)
-                cur_columns.pop()
-        return results
-
     def get_columns(self, connection, table_name, schema=None, **kw):
         table = self._get_table(connection, table_name, schema)
-        columns = self._get_columns_helper(table.schema, [])
-        result = []
-        for col in columns:
-            try:
-                coltype = _type_map[col.field_type]
-            except KeyError:
-                util.warn(
-                    "Did not recognize type '%s' of column '%s'"
-                    % (col.field_type, col.name)
-                )
-                coltype = types.NullType
-
-            if col.field_type.endswith("NUMERIC"):
-                coltype = coltype(precision=col.precision, scale=col.scale)
-            elif col.field_type == "STRING" or col.field_type == "BYTES":
-                coltype = coltype(col.max_length)
-
-            result.append(
-                {
-                    "name": col.name,
-                    "type": types.ARRAY(coltype) if col.mode == "REPEATED" else coltype,
-                    "nullable": col.mode == "NULLABLE" or col.mode == "REPEATED",
-                    "comment": col.description,
-                    "default": None,
-                    "precision": col.precision,
-                    "scale": col.scale,
-                    "max_length": col.max_length,
-                }
-            )
-
-        return result
+        return _types.get_columns(table.schema)
 
     def get_table_comment(self, connection, table_name, schema=None, **kw):
         table = self._get_table(connection, table_name, schema)
@@ -1092,6 +989,21 @@ def get_view_definition(self, connection, view_name, schema=None, **kw):
         return view.view_query
 
 
+class unnest(sqlalchemy.sql.functions.GenericFunction):
+    def __init__(self, *args, **kwargs):
+        expr = kwargs.pop("expr", None)
+        if expr is not None:
+            args = (expr,) + args
+        if len(args) != 1:
+            raise TypeError("The unnest function requires a single argument.")
+        arg = args[0]
+        if isinstance(arg, sqlalchemy.sql.expression.ColumnElement):
+            if not isinstance(arg.type, sqlalchemy.sql.sqltypes.ARRAY):
+                raise TypeError("The argument to unnest must have an ARRAY type.")
+            self.type = arg.type.item_type
+        super().__init__(*args, **kwargs)
+
+
 dialect = BigQueryDialect
 
 try:
diff --git a/sqlalchemy_bigquery/geography.py b/sqlalchemy_bigquery/geography.py
index 9a10c236..16384dd4 100644
--- a/sqlalchemy_bigquery/geography.py
+++ b/sqlalchemy_bigquery/geography.py
@@ -95,7 +95,7 @@ class Lake(Base):
             name = Column(String)
             geog = column(GEOGRAPHY)
 
-
+    See https://googleapis.dev/python/sqlalchemy-bigquery/latest/geography.html
     """
 
     def __init__(self):
diff --git a/sqlalchemy_bigquery/version.py b/sqlalchemy_bigquery/version.py
index ef8460f5..f7a8338b 100644
--- a/sqlalchemy_bigquery/version.py
+++ b/sqlalchemy_bigquery/version.py
@@ -17,4 +17,4 @@
 # IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-__version__ = "1.1.0"
+__version__ = "1.2.0"
diff --git a/testing/constraints-3.6.txt b/testing/constraints-3.6.txt
index e5ed0b2a..60421130 100644
--- a/testing/constraints-3.6.txt
+++ b/testing/constraints-3.6.txt
@@ -6,5 +6,5 @@
 # e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
 sqlalchemy==1.2.0
 google-auth==1.25.0
-google-cloud-bigquery==2.24.1
+google-cloud-bigquery==2.25.2
 google-api-core==1.30.0
diff --git a/tests/system/conftest.py b/tests/system/conftest.py
index d9db14ab..7bf76a2d 100644
--- a/tests/system/conftest.py
+++ b/tests/system/conftest.py
@@ -26,6 +26,8 @@
 from google.cloud import bigquery
 import test_utils.prefixer
 
+from sqlalchemy_bigquery import BigQueryDialect
+
 prefixer = test_utils.prefixer.Prefixer("python-bigquery-sqlalchemy", "tests/system")
 
 DATA_DIR = pathlib.Path(__file__).parent / "data"
@@ -140,6 +142,17 @@ def cleanup_datasets(bigquery_client: bigquery.Client):
             )
 
 
+@pytest.fixture(scope="session")
+def engine():
+    engine = sqlalchemy.create_engine("bigquery://", echo=True)
+    return engine
+
+
+@pytest.fixture(scope="session")
+def dialect():
+    return BigQueryDialect()
+
+
 @pytest.fixture
 def metadata():
     return sqlalchemy.MetaData()
diff --git a/tests/system/test__struct.py b/tests/system/test__struct.py
new file mode 100644
index 00000000..24863056
--- /dev/null
+++ b/tests/system/test__struct.py
@@ -0,0 +1,189 @@
+# Copyright (c) 2021 The sqlalchemy-bigquery Authors
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import datetime
+
+import packaging.version
+import pytest
+import sqlalchemy
+
+import sqlalchemy_bigquery
+
+
+def test_struct(engine, bigquery_dataset, metadata):
+    conn = engine.connect()
+    table = sqlalchemy.Table(
+        f"{bigquery_dataset}.test_struct",
+        metadata,
+        sqlalchemy.Column(
+            "person",
+            sqlalchemy_bigquery.STRUCT(
+                name=sqlalchemy.String,
+                children=sqlalchemy.ARRAY(
+                    sqlalchemy_bigquery.STRUCT(
+                        name=sqlalchemy.String, bdate=sqlalchemy.DATE
+                    )
+                ),
+            ),
+        ),
+    )
+    metadata.create_all(engine)
+
+    conn.execute(
+        table.insert().values(
+            person=dict(
+                name="bob",
+                children=[dict(name="billy", bdate=datetime.date(2020, 1, 1))],
+            )
+        )
+    )
+
+    assert list(conn.execute(sqlalchemy.select([table]))) == [
+        (
+            {
+                "name": "bob",
+                "children": [{"name": "billy", "bdate": datetime.date(2020, 1, 1)}],
+            },
+        )
+    ]
+    assert list(conn.execute(sqlalchemy.select([table.c.person.NAME]))) == [("bob",)]
+    assert list(conn.execute(sqlalchemy.select([table.c.person.children[0]]))) == [
+        ({"name": "billy", "bdate": datetime.date(2020, 1, 1)},)
+    ]
+    assert list(
+        conn.execute(sqlalchemy.select([table.c.person.children[0].bdate]))
+    ) == [(datetime.date(2020, 1, 1),)]
+    assert list(
+        conn.execute(
+            sqlalchemy.select([table]).where(table.c.person.children[0].NAME == "billy")
+        )
+    ) == [
+        (
+            {
+                "name": "bob",
+                "children": [{"name": "billy", "bdate": datetime.date(2020, 1, 1)}],
+            },
+        )
+    ]
+    assert (
+        list(
+            conn.execute(
+                sqlalchemy.select([table]).where(
+                    table.c.person.children[0].NAME == "sally"
+                )
+            )
+        )
+        == []
+    )
+
+
+def test_complex_literals_pr_67(engine, bigquery_dataset, metadata):
+    # https://github.com/googleapis/python-bigquery-sqlalchemy/pull/67
+
+    # Simple select example:
+
+    table_name = f"{bigquery_dataset}.test_comples_literals_pr_67"
+    engine.execute(
+        f"""
+        create table {table_name} as (
+            select 'a' as id,
+            struct(1 as x__count, 2 as y__count, 3 as z__count) as dimensions
+            )
+        """
+    )
+
+    table = sqlalchemy.Table(table_name, metadata, autoload_with=engine)
+
+    got = str(
+        sqlalchemy.select([(table.c.dimensions.x__count + 5).label("c")]).compile(
+            engine
+        )
+    )
+    want = (
+        f"SELECT (`{table_name}`.`dimensions`.x__count) + %(param_1:INT64)s AS `c` \n"
+        f"FROM `{table_name}`"
+    )
+
+    assert got == want
+
+    # Hopefully, "Example doing a pivot" is addressed by
+    # test_unnest_and_struct_access_233 below :)
+
+
+@pytest.mark.skipif(
+    packaging.version.parse(sqlalchemy.__version__) < packaging.version.parse("1.4"),
+    reason="unnest (and other table-valued-function) support required version 1.4",
+)
+def test_unnest_and_struct_access_233(engine, bigquery_dataset, metadata):
+    # https://github.com/googleapis/python-bigquery-sqlalchemy/issues/233
+
+    from sqlalchemy import Table, select, Column, ARRAY, String, func
+    from sqlalchemy.orm import sessionmaker
+    from sqlalchemy_bigquery import STRUCT
+
+    conn = engine.connect()
+
+    mock_table = Table(f"{bigquery_dataset}.Mock", metadata, Column("mock_id", String))
+    another_mock_table = Table(
+        f"{bigquery_dataset}.AnotherMock",
+        metadata,
+        Column("objects", ARRAY(STRUCT(object_id=String))),
+    )
+    metadata.create_all(engine)
+
+    conn.execute(
+        mock_table.insert(), dict(mock_id="x"), dict(mock_id="y"), dict(mock_id="z"),
+    )
+    conn.execute(
+        another_mock_table.insert(),
+        dict(objects=[dict(object_id="x"), dict(object_id="y"), dict(object_id="q")]),
+    )
+
+    subquery = select(
+        func.unnest(another_mock_table.c.objects).alias("another_mock_objects").column
+    ).subquery()
+
+    join = mock_table.join(
+        subquery, subquery.c.another_mock_objects["object_id"] == mock_table.c.mock_id,
+    )
+
+    query = select(mock_table).select_from(join)
+
+    got = str(query.compile(engine))
+    want = (
+        f"SELECT `{bigquery_dataset}.Mock`.`mock_id` \n"
+        f"FROM `{bigquery_dataset}.Mock` "
+        f"JOIN ("
+        f"SELECT `another_mock_objects` \n"
+        f"FROM "
+        f"`{bigquery_dataset}.AnotherMock` `{bigquery_dataset}.AnotherMock_1`, "
+        f"unnest(`{bigquery_dataset}.AnotherMock_1`.`objects`)"
+        f" AS `another_mock_objects`"
+        f") AS `anon_1` "
+        f"ON "
+        f"(`anon_1`.`another_mock_objects`.object_id) = "
+        f"`{bigquery_dataset}.Mock`.`mock_id`"
+    )
+    assert got == want
+
+    Session = sessionmaker(bind=engine)
+    session = Session()
+    results = sorted(session.execute(query))
+
+    assert results == [("x",), ("y",)]
diff --git a/tests/system/test_sqlalchemy_bigquery.py b/tests/system/test_sqlalchemy_bigquery.py
index d8622020..564c5e68 100644
--- a/tests/system/test_sqlalchemy_bigquery.py
+++ b/tests/system/test_sqlalchemy_bigquery.py
@@ -18,9 +18,10 @@
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
 
-from sqlalchemy_bigquery import BigQueryDialect
+import datetime
+import decimal
+
 from sqlalchemy.engine import create_engine
 from sqlalchemy.schema import Table, MetaData, Column
 from sqlalchemy.ext.declarative import declarative_base
@@ -32,8 +33,8 @@
 from pytz import timezone
 import pytest
 import sqlalchemy
-import datetime
-import decimal
+
+import sqlalchemy_bigquery
 
 ONE_ROW_CONTENTS_EXPANDED = [
     588,
@@ -98,17 +99,24 @@
     {"name": "bytes", "type": types.BINARY(), "nullable": True, "default": None},
     {
         "name": "record",
-        "type": types.JSON(),
+        "type": sqlalchemy_bigquery.STRUCT(name=types.String, age=types.Integer),
         "nullable": True,
         "default": None,
         "comment": "In Standard SQL this data type is a STRUCT<name STRING, age INT64>.",
     },
     {"name": "record.name", "type": types.String(), "nullable": True, "default": None},
     {"name": "record.age", "type": types.Integer(), "nullable": True, "default": None},
-    {"name": "nested_record", "type": types.JSON(), "nullable": True, "default": None},
+    {
+        "name": "nested_record",
+        "type": sqlalchemy_bigquery.STRUCT(
+            record=sqlalchemy_bigquery.STRUCT(name=types.String, age=types.Integer)
+        ),
+        "nullable": True,
+        "default": None,
+    },
     {
         "name": "nested_record.record",
-        "type": types.JSON(),
+        "type": sqlalchemy_bigquery.STRUCT(name=types.String, age=types.Integer),
         "nullable": True,
         "default": None,
     },
@@ -133,17 +141,6 @@
 ]
 
 
-@pytest.fixture(scope="session")
-def engine():
-    engine = create_engine("bigquery://", echo=True)
-    return engine
-
-
-@pytest.fixture(scope="session")
-def dialect():
-    return BigQueryDialect()
-
-
 @pytest.fixture(scope="session")
 def engine_using_test_dataset(bigquery_dataset):
     engine = create_engine(f"bigquery:///{bigquery_dataset}", echo=True)
diff --git a/tests/unit/conftest.py b/tests/unit/conftest.py
index 886e9aee..d311a134 100644
--- a/tests/unit/conftest.py
+++ b/tests/unit/conftest.py
@@ -42,6 +42,11 @@
 )
 
 
+@pytest.fixture()
+def engine():
+    return sqlalchemy.create_engine("bigquery://myproject/mydataset")
+
+
 @pytest.fixture()
 def faux_conn():
     test_data = dict(execute=[])
diff --git a/tests/unit/test__struct.py b/tests/unit/test__struct.py
new file mode 100644
index 00000000..ee096fb5
--- /dev/null
+++ b/tests/unit/test__struct.py
@@ -0,0 +1,152 @@
+# Copyright (c) 2017 The sqlalchemy-bigquery Authors
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+import datetime
+
+import pytest
+
+import sqlalchemy
+
+
+def _test_struct():
+    from sqlalchemy_bigquery import STRUCT
+
+    return STRUCT(
+        name=sqlalchemy.String,
+        children=sqlalchemy.ARRAY(
+            STRUCT(name=sqlalchemy.String, bdate=sqlalchemy.DATE)
+        ),
+    )
+
+
+def test_struct_colspec():
+    assert _test_struct().get_col_spec() == (
+        "STRUCT<name STRING, children ARRAY<STRUCT<name STRING, bdate DATE>>>"
+    )
+
+
+def test_struct_repr():
+    assert repr(_test_struct()) == (
+        "STRUCT(name=String(), children=ARRAY(STRUCT(name=String(), bdate=DATE())))"
+    )
+
+
+def test_bind_processor():
+    assert _test_struct().bind_processor(None) is dict
+
+
+def _col():
+    return sqlalchemy.Table(
+        "t", sqlalchemy.MetaData(), sqlalchemy.Column("person", _test_struct()),
+    ).c.person
+
+
+@pytest.mark.parametrize(
+    "expr,sql",
+    [
+        (_col()["name"], "`t`.`person`.name"),
+        (_col()["Name"], "`t`.`person`.Name"),
+        (_col().NAME, "`t`.`person`.NAME"),
+        (_col().children, "`t`.`person`.children"),
+        (
+            # SQLAlchemy doesn't add the label in this case for some reason.
+            # TODO: why?
+            # https://github.com/googleapis/python-bigquery-sqlalchemy/issues/336
+            _col().children[0].label("anon_1"),
+            "(`t`.`person`.children)[OFFSET(%(param_1:INT64)s)]",
+        ),
+        (
+            _col().children[0]["bdate"],
+            "((`t`.`person`.children)[OFFSET(%(param_1:INT64)s)]).bdate",
+        ),
+        (
+            _col().children[0].bdate,
+            "((`t`.`person`.children)[OFFSET(%(param_1:INT64)s)]).bdate",
+        ),
+    ],
+)
+def test_struct_traversal_project(engine, expr, sql):
+    sql = f"SELECT {sql} AS `anon_1` \nFROM `t`"
+    assert str(sqlalchemy.select([expr]).compile(engine)) == sql
+
+
+@pytest.mark.parametrize(
+    "expr,sql",
+    [
+        (_col()["name"] == "x", "(`t`.`person`.name) = %(param_1:STRING)s"),
+        (_col()["Name"] == "x", "(`t`.`person`.Name) = %(param_1:STRING)s"),
+        (_col().NAME == "x", "(`t`.`person`.NAME) = %(param_1:STRING)s"),
+        (
+            _col().children[0] == dict(name="foo", bdate=datetime.date(2020, 1, 1)),
+            "(`t`.`person`.children)[OFFSET(%(param_1:INT64)s)]"
+            " = %(param_2:STRUCT<name STRING, bdate DATE>)s",
+        ),
+        (
+            _col().children[0] == dict(name="foo", bdate=datetime.date(2020, 1, 1)),
+            "(`t`.`person`.children)[OFFSET(%(param_1:INT64)s)]"
+            " = %(param_2:STRUCT<name STRING, bdate DATE>)s",
+        ),
+        (
+            _col().children[0]["bdate"] == datetime.date(2021, 8, 30),
+            "(((`t`.`person`.children)[OFFSET(%(param_1:INT64)s)]).bdate)"
+            " = %(param_2:DATE)s",
+        ),
+        (
+            _col().children[0].bdate == datetime.date(2021, 8, 30),
+            "(((`t`.`person`.children)[OFFSET(%(param_1:INT64)s)]).bdate)"
+            " = %(param_2:DATE)s",
+        ),
+    ],
+)
+def test_struct_traversal_filter(engine, expr, sql, param=1):
+    want = f"SELECT `t`.`person` \nFROM `t`, `t` \nWHERE {sql}"
+    got = str(sqlalchemy.select([_col()]).where(expr).compile(engine))
+    assert got == want
+
+
+def test_struct_insert_type_info(engine, metadata):
+    t = sqlalchemy.Table("t", metadata, sqlalchemy.Column("person", _test_struct()))
+    got = str(
+        t.insert()
+        .values(
+            person=dict(
+                name="bob",
+                children=[dict(name="billy", bdate=datetime.date(2020, 1, 1))],
+            )
+        )
+        .compile(engine)
+    )
+
+    assert got == (
+        "INSERT INTO `t` (`person`) VALUES (%(person:"
+        "STRUCT<name STRING, children ARRAY<STRUCT<name STRING, bdate DATE>>>"
+        ")s)"
+    )
+
+
+def test_struct_non_string_field_access(engine):
+    with pytest.raises(
+        TypeError,
+        match="STRUCT fields can only be accessed with strings field names, not 42",
+    ):
+        _col()[42]
+
+
+def test_struct_bad_name(engine):
+    with pytest.raises(KeyError, match="42"):
+        _col()["42"]
diff --git a/tests/unit/test_catalog_functions.py b/tests/unit/test_catalog_functions.py
index 6613ae57..fd7d0d63 100644
--- a/tests/unit/test_catalog_functions.py
+++ b/tests/unit/test_catalog_functions.py
@@ -165,8 +165,8 @@ def test_get_table_comment(faux_conn):
         ("STRING(42)", sqlalchemy.types.String(42), dict(max_length=42)),
         ("BYTES", sqlalchemy.types.BINARY(), ()),
         ("BYTES(42)", sqlalchemy.types.BINARY(42), dict(max_length=42)),
-        ("INT64", sqlalchemy.types.Integer, ()),
-        ("FLOAT64", sqlalchemy.types.Float, ()),
+        ("INT64", sqlalchemy.types.Integer(), ()),
+        ("FLOAT64", sqlalchemy.types.Float(), ()),
         ("NUMERIC", sqlalchemy.types.NUMERIC(), ()),
         ("NUMERIC(4)", sqlalchemy.types.NUMERIC(4), dict(precision=4)),
         ("NUMERIC(4, 2)", sqlalchemy.types.NUMERIC(4, 2), dict(precision=4, scale=2)),
@@ -177,11 +177,11 @@ def test_get_table_comment(faux_conn):
             sqlalchemy.types.NUMERIC(42, 2),
             dict(precision=42, scale=2),
         ),
-        ("BOOL", sqlalchemy.types.Boolean, ()),
-        ("TIMESTAMP", sqlalchemy.types.TIMESTAMP, ()),
-        ("DATE", sqlalchemy.types.DATE, ()),
-        ("TIME", sqlalchemy.types.TIME, ()),
-        ("DATETIME", sqlalchemy.types.DATETIME, ()),
+        ("BOOL", sqlalchemy.types.Boolean(), ()),
+        ("TIMESTAMP", sqlalchemy.types.TIMESTAMP(), ()),
+        ("DATE", sqlalchemy.types.DATE(), ()),
+        ("TIME", sqlalchemy.types.TIME(), ()),
+        ("DATETIME", sqlalchemy.types.DATETIME(), ()),
         ("THURSDAY", sqlalchemy.types.NullType, ()),
     ],
 )
@@ -207,6 +207,8 @@ def test_get_table_columns(faux_conn, btype, atype, extra):
 
 
 def test_get_table_columns_special_cases(faux_conn):
+    from sqlalchemy_bigquery import STRUCT
+
     cursor = faux_conn.connection.cursor()
     cursor.execute("create table foo (s STRING, n INT64 not null, r RECORD)")
     client = faux_conn.connection._client
@@ -218,10 +220,10 @@ def test_get_table_columns_special_cases(faux_conn):
     )
 
     actual = faux_conn.dialect.get_columns(faux_conn, "foo")
-    stype = actual[0].pop("type")
-    assert isinstance(stype, sqlalchemy.types.ARRAY)
-    assert isinstance(stype.item_type, sqlalchemy.types.String)
-    assert actual == [
+    for a in actual:
+        a["type"] = repr(a["type"])
+
+    expected = [
         {
             "comment": "a fine column",
             "default": None,
@@ -230,13 +232,14 @@ def test_get_table_columns_special_cases(faux_conn):
             "max_length": None,
             "precision": None,
             "scale": None,
+            "type": repr(sqlalchemy.types.ARRAY(sqlalchemy.types.String())),
         },
         {
             "comment": None,
             "default": None,
             "name": "n",
             "nullable": False,
-            "type": sqlalchemy.types.Integer,
+            "type": repr(sqlalchemy.types.Integer()),
             "max_length": None,
             "precision": None,
             "scale": None,
@@ -246,7 +249,9 @@ def test_get_table_columns_special_cases(faux_conn):
             "default": None,
             "name": "r",
             "nullable": True,
-            "type": sqlalchemy.types.JSON,
+            "type": repr(
+                STRUCT(i=sqlalchemy.types.Integer(), f=sqlalchemy.types.Float())
+            ),
             "max_length": None,
             "precision": None,
             "scale": None,
@@ -256,7 +261,7 @@ def test_get_table_columns_special_cases(faux_conn):
             "default": None,
             "name": "r.i",
             "nullable": True,
-            "type": sqlalchemy.types.Integer,
+            "type": repr(sqlalchemy.types.Integer()),
             "max_length": None,
             "precision": None,
             "scale": None,
@@ -266,12 +271,13 @@ def test_get_table_columns_special_cases(faux_conn):
             "default": None,
             "name": "r.f",
             "nullable": True,
-            "type": sqlalchemy.types.Float,
+            "type": repr(sqlalchemy.types.Float()),
             "max_length": None,
             "precision": None,
             "scale": None,
         },
     ]
+    assert actual == expected
 
 
 def test_has_table(faux_conn):
diff --git a/tests/unit/test_dialect_types.py b/tests/unit/test_dialect_types.py
index a1af7c47..47ffd94a 100644
--- a/tests/unit/test_dialect_types.py
+++ b/tests/unit/test_dialect_types.py
@@ -24,7 +24,7 @@
 def test_types_import():
     """Demonstrate behavior of importing types independent of any other import."""
     dialect_module = importlib.import_module("sqlalchemy_bigquery")
-    base_module = importlib.import_module("sqlalchemy_bigquery.base")
-    custom_types = getattr(base_module, "_type_map")
+    _types_module = importlib.import_module("sqlalchemy_bigquery._types")
+    custom_types = getattr(_types_module, "_type_map")
     for type_name, type_value in custom_types.items():
         assert getattr(dialect_module, type_name) == type_value
diff --git a/tests/unit/test_select.py b/tests/unit/test_select.py
index 474fc9d9..641677a4 100644
--- a/tests/unit/test_select.py
+++ b/tests/unit/test_select.py
@@ -129,9 +129,6 @@ def test_typed_parameters(faux_conn, type_, val, btype, vrep):
 
     faux_conn.execute(table.insert().values(**{col_name: val}))
 
-    if btype.startswith("ARRAY<"):
-        btype = btype[6:-1]
-
     ptype = btype[: btype.index("(")] if "(" in btype else btype
 
     assert faux_conn.test_data["execute"][-1] == (
@@ -173,8 +170,12 @@ def test_typed_parameters(faux_conn, type_, val, btype, vrep):
     )
 
 
-def test_select_json(faux_conn, metadata):
-    table = sqlalchemy.Table("t", metadata, sqlalchemy.Column("x", sqlalchemy.JSON))
+def test_select_struct(faux_conn, metadata):
+    from sqlalchemy_bigquery import STRUCT
+
+    table = sqlalchemy.Table(
+        "t", metadata, sqlalchemy.Column("x", STRUCT(y=sqlalchemy.Integer)),
+    )
 
     faux_conn.ex("create table t (x RECORD)")
     faux_conn.ex("""insert into t values ('{"y": 1}')""")
@@ -430,3 +431,11 @@ def test_unnest_w_no_table_references(faux_conn, alias):
     assert " ".join(compiled.strip().split()) == (
         "SELECT `anon_1` FROM unnest(%(unnest_1)s) AS `anon_1`"
     )
+
+
+def test_array_indexing(engine, metadata):
+    t = sqlalchemy.Table(
+        "t", metadata, sqlalchemy.Column("a", sqlalchemy.ARRAY(sqlalchemy.String)),
+    )
+    got = str(sqlalchemy.select([t.c.a[0]]).compile(engine))
+    assert got == "SELECT `t`.`a`[OFFSET(%(a_1:INT64)s)] AS `anon_1` \nFROM `t`"
diff --git a/tests/unit/test_sqlalchemy_bigquery.py b/tests/unit/test_sqlalchemy_bigquery.py
index a4c81367..75cbec42 100644
--- a/tests/unit/test_sqlalchemy_bigquery.py
+++ b/tests/unit/test_sqlalchemy_bigquery.py
@@ -10,6 +10,7 @@
 from google.cloud import bigquery
 from google.cloud.bigquery.dataset import DatasetListItem
 from google.cloud.bigquery.table import TableListItem
+import packaging.version
 import pytest
 import sqlalchemy
 
@@ -178,3 +179,53 @@ def test_follow_dialect_attribute_convention():
 
     assert sqlalchemy_bigquery.dialect is sqlalchemy_bigquery.BigQueryDialect
     assert sqlalchemy_bigquery.base.dialect is sqlalchemy_bigquery.BigQueryDialect
+
+
+@pytest.mark.parametrize(
+    "args,kw,error",
+    [
+        ((), {}, "The unnest function requires a single argument."),
+        ((1, 1), {}, "The unnest function requires a single argument."),
+        ((1,), {"expr": 1}, "The unnest function requires a single argument."),
+        ((1, 1), {"expr": 1}, "The unnest function requires a single argument."),
+        (
+            (),
+            {"expr": sqlalchemy.Column("x", sqlalchemy.String)},
+            "The argument to unnest must have an ARRAY type.",
+        ),
+        (
+            (sqlalchemy.Column("x", sqlalchemy.String),),
+            {},
+            "The argument to unnest must have an ARRAY type.",
+        ),
+    ],
+)
+def test_unnest_function_errors(args, kw, error):
+    # Make sure the unnest function is registered with SQLAlchemy, which
+    # happens when sqlalchemy_bigquery is imported.
+    import sqlalchemy_bigquery  # noqa
+
+    with pytest.raises(TypeError, match=error):
+        sqlalchemy.func.unnest(*args, **kw)
+
+
+@pytest.mark.parametrize(
+    "args,kw",
+    [
+        ((), {"expr": sqlalchemy.Column("x", sqlalchemy.ARRAY(sqlalchemy.String))}),
+        ((sqlalchemy.Column("x", sqlalchemy.ARRAY(sqlalchemy.String)),), {}),
+    ],
+)
+def test_unnest_function(args, kw):
+    # Make sure the unnest function is registered with SQLAlchemy, which
+    # happens when sqlalchemy_bigquery is imported.
+    import sqlalchemy_bigquery  # noqa
+
+    f = sqlalchemy.func.unnest(*args, **kw)
+    assert isinstance(f.type, sqlalchemy.String)
+    if packaging.version.parse(sqlalchemy.__version__) >= packaging.version.parse(
+        "1.4"
+    ):
+        assert isinstance(
+            sqlalchemy.select([f]).subquery().c.unnest.type, sqlalchemy.String
+        )