diff --git a/bi_sql_editor_aggregate/README.rst b/bi_sql_editor_aggregate/README.rst
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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+   :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+   :alt: License: AGPL-3
+
+==================
+BI Views aggregate
+==================
+
+This module extends the functionality of bi_sql_editor, to support creation
+custom aggregation for float and integer values.
+
+After the model is generated, before creating the UI, the option is given
+to define aggregation - either Sum (Default), Average, Minimum, or Maximum.
+
+Configuration
+=============
+
+No configuration is required after installation.
+
+Usage
+=====
+
+To use this module, you need to adjust the aggregation on the custom fields
+tab of the sql_view between validating the SQL
+
+#. Go to 'Reporting' / 'Custom Reports'
+
+Known issues / Roadmap
+======================
+
+* Can be integrated with bi_sql_editor, but breaks for existing sites.
+* Would be good to integrate and remove need for additional install.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues
+<https://github.com/OCA/reporting-engine/issues>`_. In case of trouble, please
+check there if your issue has already been reported. If you spotted it first,
+help us smash it by providing detailed and welcomed feedback.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Richard deMeester, Willdoo IT (http://www.willdooit.com/)
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit https://odoo-community.org.
diff --git a/bi_sql_editor_aggregate/__init__.py b/bi_sql_editor_aggregate/__init__.py
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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import models
diff --git a/bi_sql_editor_aggregate/__manifest__.py b/bi_sql_editor_aggregate/__manifest__.py
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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+{
+    'name': 'BI SQL Editor Aggregate',
+    'summary': 'BI SQL Editor Aggregation',
+    'version': '12.0.1.0.0',
+    'license': 'AGPL-3',
+    'category': 'Reporting',
+    'author': 'Richard deMeester,Odoo Community Association (OCA)',
+    'website': 'https://github.com/OCA/reporting-engine',
+    'depends': [
+        'bi_sql_editor',
+    ],
+    'data': [
+        'views/view_bi_sql_view.xml',
+    ],
+    'demo': [
+    ],
+    'installable': True,
+}
diff --git a/bi_sql_editor_aggregate/description/icon.png b/bi_sql_editor_aggregate/description/icon.png
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diff --git a/bi_sql_editor_aggregate/models/__init__.py b/bi_sql_editor_aggregate/models/__init__.py
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+++ b/bi_sql_editor_aggregate/models/__init__.py
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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import bi_sql_view
+from . import bi_sql_view_field
+from . import ir_model
diff --git a/bi_sql_editor_aggregate/models/bi_sql_view.py b/bi_sql_editor_aggregate/models/bi_sql_view.py
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+++ b/bi_sql_editor_aggregate/models/bi_sql_view.py
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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import models, tools
+
+
+class BiSQLView(models.Model):
+    _inherit = 'bi.sql.view'
+
+    def check_manual_fields(self, model):
+        # check the fields we need are defined on self, to stop it going
+        # early on install / startup - particularly problematic during upgrade
+        if 'group_operator' in tools.table_columns(
+                self.env.cr, 'bi_sql_view_field') and\
+                model._name.startswith(self._model_prefix):
+            # Use SQL instead of ORM, as ORM might not be fully initialised -
+            # we have no control over the order that fields are defined!
+            # We are not concerned about user security rules.
+            self.env.cr.execute(
+                """
+SELECT
+    f.name,
+    f.ttype,
+    f.group_operator
+FROM
+    bi_sql_view v
+    LEFT JOIN bi_sql_view_field f ON f.bi_sql_view_id = v.id
+WHERE
+    v.model_name = %s
+;
+                """, (model._name,)
+                )
+            sql_fields = self.env.cr.fetchall()
+
+            for sql_field in sql_fields:
+                if sql_field[0] in model._fields and\
+                        sql_field[1] in ('integer', 'float') and\
+                        sql_field[2]:
+                    model._fields[sql_field[0]].group_operator = sql_field[2]
diff --git a/bi_sql_editor_aggregate/models/bi_sql_view_field.py b/bi_sql_editor_aggregate/models/bi_sql_view_field.py
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index 000000000..db79ab218
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+++ b/bi_sql_editor_aggregate/models/bi_sql_view_field.py
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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import fields, models
+
+
+class BiSQLViewField(models.Model):
+    _inherit = 'bi.sql.view.field'
+
+    _GROUP_OPERATOR_SELECTION = [
+        ('sum', 'Sum'),
+        ('avg', 'Average'),
+        ('min', 'Minimum'),
+        ('max', 'Maximum'),
+    ]
+
+    group_operator = fields.Selection(
+        string='Group Operator', selection=_GROUP_OPERATOR_SELECTION,
+        help="By default, Odoo will sum the values when grouping. If you wish"
+        " to alter the behaviour, choose an alternate Group Operator")
diff --git a/bi_sql_editor_aggregate/models/ir_model.py b/bi_sql_editor_aggregate/models/ir_model.py
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+++ b/bi_sql_editor_aggregate/models/ir_model.py
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+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import models
+
+
+class IrModelFields(models.Model):
+    _inherit = 'ir.model.fields'
+
+    def _add_manual_fields(self, model):
+        super()._add_manual_fields(model)
+        if 'bi.sql.view' in self.env:
+            Sql = self.env['bi.sql.view']
+            if hasattr(Sql, 'check_manual_fields'):
+                Sql.check_manual_fields(model)
diff --git a/bi_sql_editor_aggregate/views/view_bi_sql_view.xml b/bi_sql_editor_aggregate/views/view_bi_sql_view.xml
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+++ b/bi_sql_editor_aggregate/views/view_bi_sql_view.xml
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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+-->
+
+<odoo>
+
+    <record id="view_bi_sql_view_form" model="ir.ui.view">
+        <field name="model">bi.sql.view</field>
+        <field name='inherit_id' ref='bi_sql_editor.view_bi_sql_view_form'/>
+        <field name="arch" type="xml">
+            <field name="ttype" position='before'>
+                <field name='group_operator' attrs="{
+                    'invisible': ['!', ('ttype', 'in', ('float', 'integer'))]}"/>
+            </field>
+        </field>
+    </record>
+
+</odoo>