text: from django.contrib.postgres.fields import ArrayField, JSONField
  from django.db.models import Value
  from django.db.models.aggregates import Aggregate
  
  from .mixins import OrderableAggMixin
  
  __all__ = [
      'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'JSONBAgg', 'StringAgg',
  ]
  
  
  class ArrayAgg(OrderableAggMixin, Aggregate):
      function = 'ARRAY_AGG'
      template = '%(function)s(%(distinct)s%(expressions)s %(ordering)s)'
      allow_distinct = True
  
      @property
      def output_field(self):
          return ArrayField(self.source_expressions[0].output_field)
  
      def convert_value(self, value, expression, connection):
          if not value:
              return []
          return value
  
  
  class BitAnd(Aggregate):
      function = 'BIT_AND'
  
  
  class BitOr(Aggregate):
      function = 'BIT_OR'
  
  
  class BoolAnd(Aggregate):
      function = 'BOOL_AND'
  
  
  class BoolOr(Aggregate):
      function = 'BOOL_OR'
  
  
  class JSONBAgg(Aggregate):
      function = 'JSONB_AGG'
      output_field = JSONField()
  
      def convert_value(self, value, expression, connection):
          if not value:
              return []
          return value
  
  
  class StringAgg(OrderableAggMixin, Aggregate):
      function = 'STRING_AGG'
      template = '%(function)s(%(distinct)s%(expressions)s %(ordering)s)'
      allow_distinct = True
  
      def __init__(self, expression, delimiter, **extra):
          delimiter_expr = Value(str(delimiter))
          super().__init__(expression, delimiter_expr, **extra)
  
      def convert_value(self, value, expression, connection):
          if not value:
              return ''
          return value
  