BiteTheDDDDt commented on code in PR #20164:
URL: https://github.com/apache/doris/pull/20164#discussion_r1217728506


##########
fe/fe-core/src/main/java/org/apache/doris/nereids/glue/translator/ExpressionTranslator.java:
##########
@@ -430,10 +442,44 @@ public Expr visitIsNull(IsNull isNull, 
PlanTranslatorContext context) {
         return new IsNullPredicate(isNull.child().accept(this, context), 
false, true);
     }
 
+    @Override
+    public Expr visitStateCombinator(StateCombinator combinator, 
PlanTranslatorContext context) {
+        List<Expr> arguments = combinator.getArguments().stream().map(arg -> 
arg.accept(this, context))
+                .collect(Collectors.toList());
+        return Function.convertToStateCombinator(new FunctionCallExpr(
+                translateAggregateFunction(combinator.getNestedFunction()), 
new FunctionParams(false, arguments)));
+    }
+
+    @Override
+    public Expr visitMergeCombinator(MergeCombinator combinator, 
PlanTranslatorContext context) {
+        List<Expr> arguments = combinator.getArguments().stream().map(arg -> 
arg.accept(this, context))
+                .collect(Collectors.toList());
+        return Function.convertToMergeCombinator(new FunctionCallExpr(
+                translateAggregateFunction(combinator.getNestedFunction()), 
new FunctionParams(false, arguments)));
+    }
+
+    private org.apache.doris.catalog.AggregateFunction 
translateAggregateFunction(AggregateFunction function) {

Review Comment:
   This logic can be used for both 
`translateAggregateFunction`/`visitStateCombinator`/`visitMergeCombinator`



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