Use integer without grouping for year reporting

issue10731
review355501002

opportunity.py

@@ -692,7 +692,7 @@ class SaleOpportunityEmployeeContext(ModelView):
 class SaleOpportunityMonthly(SaleOpportunityReportMixin, ModelSQL, ModelView):
     'Sale Opportunity per Month'
     __name__ = 'sale.opportunity_monthly'
-    year = fields.Char('Year')
+    year = fields.Integer("Year")
     month = fields.Many2One('ir.calendar.month', "Month")
     year_month = fields.Function(fields.Char('Year-Month'),
             'get_year_month')
@@ -714,9 +714,7 @@ class SaleOpportunityMonthly(SaleOpportunityReportMixin, ModelSQL, ModelView):
         query = super(SaleOpportunityMonthly, cls).table_query()
         opportunity, = query.from_
         type_id = cls.id.sql_type().base
-        type_year = cls.year.sql_type().base
-        year_column = Extract('YEAR', opportunity.start_date
-            ).cast(type_year).as_('year')
+        year_column = Extract('YEAR', opportunity.start_date).as_('year')
         month_index = Extract('MONTH', opportunity.start_date)
         query.from_ = opportunity.join(
             month, condition=month_index == month.index)
@@ -734,7 +732,7 @@ class SaleOpportunityEmployeeMonthly(
         SaleOpportunityReportMixin, ModelSQL, ModelView):
     'Sale Opportunity per Employee per Month'
     __name__ = 'sale.opportunity_employee_monthly'
-    year = fields.Char('Year')
+    year = fields.Integer("Year")
     month = fields.Many2One('ir.calendar.month', "Month")
     employee = fields.Many2One('company.employee', 'Employee')
 
@@ -753,9 +751,7 @@ class SaleOpportunityEmployeeMonthly(
         query = super(SaleOpportunityEmployeeMonthly, cls).table_query()
         opportunity, = query.from_
         type_id = cls.id.sql_type().base
-        type_year = cls.year.sql_type().base
-        year_column = Extract('YEAR', opportunity.start_date
-            ).cast(type_year).as_('year')
+        year_column = Extract('YEAR', opportunity.start_date).as_('year')
         month_index = Extract('MONTH', opportunity.start_date)
         query.from_ = opportunity.join(
             month, condition=month_index == month.index)