Fix ATan2, Log, Ln and Round

Author: OskarPersson

sql_server/pyodbc/__init__.py

@@ -0,0 +1 @@
+import sql_server.pyodbc.functions  # noqa

sql_server/pyodbc/functions.py

@@ -1,5 +1,30 @@
 from django.db.models.functions import Cast
+from django.db.models.functions.math import ATan2, Log, Ln, Round
 
 
 class TryCast(Cast):
     function = 'TRY_CAST'
+
+
+def sqlserver_atan2(self, compiler, connection, **extra_context):
+    return self.as_sql(compiler, connection, function='ATN2', **extra_context)
+
+
+def sqlserver_log(self, compiler, connection, **extra_context):
+    clone = self.copy()
+    clone.set_source_expressions(self.get_source_expressions()[::-1])
+    return clone.as_sql(compiler, connection, **extra_context)
+
+
+def sqlserver_ln(self, compiler, connection, **extra_context):
+    return self.as_sql(compiler, connection, function='LOG', **extra_context)
+
+
+def sqlserver_round(self, compiler, connection, **extra_context):
+    return self.as_sql(compiler, connection, template='%(function)s(%(expressions)s, 0)', **extra_context)
+
+
+ATan2.as_microsoft = sqlserver_atan2
+Log.as_microsoft = sqlserver_log
+Ln.as_microsoft = sqlserver_ln
+Round.as_microsoft = sqlserver_round