andygrove commented on code in PR #297:
URL: https://github.com/apache/datafusion-comet/pull/297#discussion_r1576321475


##########
core/src/execution/proto/expr.proto:
##########
@@ -165,6 +167,18 @@ message CovPopulation {
   DataType datatype = 4;
 }
 
+message VarianceSample {
+  Expr child = 1;
+  bool null_on_divide_by_zero = 2;
+  DataType datatype = 3;
+}
+
+message VariancePopulation {
+  Expr child = 1;
+  bool null_on_divide_by_zero = 2;
+  DataType datatype = 3;
+}

Review Comment:
   I don't think we need to have the same struct defined twice here because we 
have separate field tags (14 and 15) in AggExpr to represent the two different 
expressions?



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