Refs #22936 -- Removed unused code in Field.get_db_prep_lookup().

# purposes.

from django.core.exceptions import FieldDoesNotExist  # NOQA

from django.db import connection, connections, router

from django.db.models.query_utils import QueryWrapper, RegisterLookupMixin

from django.db.models.query_utils import RegisterLookupMixin

from django.utils import six, timezone

from django.utils.datastructures import DictWrapper

from django.utils.dateparse import (

        if not prepared:

            value = self.get_prep_lookup(lookup_type, value)

            prepared = True

        if hasattr(value, 'get_compiler'):

            value = value.get_compiler(connection=connection)

        if hasattr(value, 'as_sql') or hasattr(value, '_as_sql'):

            # If the value has a relabeled_clone method it means the

            # value will be handled later on.

            if hasattr(value, 'relabeled_clone'):

                return value

            if hasattr(value, 'as_sql'):

                sql, params = value.as_sql()

            else:

                sql, params = value._as_sql(connection=connection)

            return QueryWrapper(('(%s)' % sql), params)

        if lookup_type in ('search', 'regex', 'iregex', 'contains',

                           'icontains', 'iexact', 'startswith', 'endswith',

                           'istartswith', 'iendswith'):

            return [value]

        elif lookup_type in ('exact', 'gt', 'gte', 'lt', 'lte'):

        if lookup_type in ('exact', 'gt', 'gte', 'lt', 'lte'):

            return [self.get_db_prep_value(value, connection=connection,

                                           prepared=prepared)]

        elif lookup_type in ('range', 'in'):

            return [self.get_db_prep_value(v, connection=connection,

                                           prepared=prepared) for v in value]

        elif lookup_type == 'isnull':

            return []

        else:

            return [value]