alamb commented on a change in pull request #840:
URL: https://github.com/apache/arrow-datafusion/pull/840#discussion_r685093844



##########
File path: ballista/rust/core/proto/ballista.proto
##########
@@ -144,18 +144,19 @@ enum ScalarFunction {
   TOTIMESTAMP = 24;
   ARRAY = 25;
   NULLIF = 26;
-  DATETRUNC = 27;
-  MD5 = 28;
-  SHA224 = 29;
-  SHA256 = 30;
-  SHA384 = 31;
-  SHA512 = 32;
-  LN = 33;
+  DATEPART = 27;

Review comment:
       I think until we know someone is using the ballista codebase in a way 
that such a change will affect them, we should not spend extra time striving 
for backwards compatibility (aka in my opinion this change is fine).
   
   Ballista also looks to me like more of an overall system (aka something 
people could use directly rather than as a library) which is different than 
DataFusion. I wonder if internal changes such as these enum values changes are 
less of an issue with such a system. 




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