[Update] 优化sql, or方式改为union (#3682)

* [Update] 优化sql, or方式改为union

* [Update] 优化union操作，直接union后，queryset 的一些参数不能使用，如annoate, 如filter assets__isnull=True

apps/common/utils/django.py

@@ -2,6 +2,7 @@
 #
 import re
 from django.shortcuts import reverse as dj_reverse
+from django.db.models import Subquery, QuerySet
 from django.conf import settings
 from django.utils import timezone
 
@@ -35,3 +36,16 @@ def date_expired_default():
         years = 70
     return timezone.now() + timezone.timedelta(days=365*years)
 
+
+def union_queryset(*args, base_queryset=None):
+    if len(args) == 1:
+        return args[0]
+    elif len(args) == 0:
+        raise ValueError("args is empty")
+    args = [q.order_by() for q in args]
+    sub_query = args[0].union(*args[1:])
+    queryset_id = list(sub_query.values_list('id', flat=True))
+    if not base_queryset:
+        base_queryset = args[0].model.objects
+    queryset = base_queryset.filter(id__in=queryset_id)
+    return queryset