fix(spanner): restore implicit database_dialect reload in sync client

Author: sinhasubham

google/cloud/spanner_v1/_async/database.py

@@ -410,6 +410,9 @@ def database_dialect(self):
         :rtype: :class:`google.cloud.spanner_admin_database_v1.types.DatabaseDialect`
         :returns: the dialect of the database
         """
+        if self._database_dialect == DatabaseDialect.DATABASE_DIALECT_UNSPECIFIED:
+            if not CrossSync.is_async:
+                self.reload()
         return self._database_dialect
 
     @property

google/cloud/spanner_v1/database.py

@@ -358,6 +358,8 @@ def database_dialect(self):
 
         :rtype: :class:`google.cloud.spanner_admin_database_v1.types.DatabaseDialect`
         :returns: the dialect of the database"""
+        if self._database_dialect == DatabaseDialect.DATABASE_DIALECT_UNSPECIFIED:
+            self.reload()
         return self._database_dialect
 
     @property