From e6748e0bace5df7274e446e60a7d68979e99f64b Mon Sep 17 00:00:00 2001
From: dauinsight <145612907+dauinsight@users.noreply.github.com>
Date: Fri, 22 Dec 2023 10:03:26 -0800
Subject: [PATCH] Implement fix for empty aggregate (#324)

---
 mssql/compiler.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mssql/compiler.py b/mssql/compiler.py
index 2dfe1b6c..e2e0b703 100644
--- a/mssql/compiler.py
+++ b/mssql/compiler.py
@@ -16,7 +16,7 @@
 if django.VERSION >= (3, 1):
     from django.db.models.fields.json import compile_json_path, KeyTransform as json_KeyTransform
 if django.VERSION >= (4, 2):
-    from django.core.exceptions import FullResultSet
+    from django.core.exceptions import EmptyResultSet, FullResultSet
 
 def _as_sql_agv(self, compiler, connection):
     return self.as_sql(compiler, connection, template='%(function)s(CONVERT(float, %(field)s))')
@@ -241,6 +241,11 @@ def as_sql(self, with_limits=True, with_col_aliases=False):
                 if django.VERSION >= (4, 2):
                     try:
                         where, w_params = self.compile(self.where) if self.where is not None else ("", [])
+                    except EmptyResultSet:
+                        if self.elide_empty:
+                            raise
+                        # Use a predicate that's always False.
+                        where, w_params = "0 = 1", []
                     except FullResultSet:
                         where, w_params = "", []
                     try: