asolimando commented on code in PR #3637:
URL: https://github.com/apache/hive/pull/3637#discussion_r1000687733


##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/Vectorizer.java:
##########
@@ -4635,7 +4636,26 @@ public static 
ImmutablePair<VectorAggregationDesc,String> getVectorAggregationDe
             "and output type: \"" + outputColVectorType + "\" " +
             "and mode: " + udafEvaluatorMode + " not supported for " +
             "evaluator " + evaluator.getClass().getSimpleName();
-    return new ImmutablePair<VectorAggregationDesc,String>(null, issue);
+    return new ImmutablePair<>(null, issue);
+  }
+
+  private static List<ConstantVectorExpression> getConstantParams(
+      VectorizationContext vContext, List<ExprNodeDesc> parameterList) throws 
HiveException {
+    if (parameterList.isEmpty()) {
+      return Collections.emptyList();
+    }
+
+    final List<ConstantVectorExpression> res = new 
ArrayList<>(parameterList.size() - 1);
+
+    // skip the first parameter as it is not a constant
+    for (ExprNodeDesc exprNodeDesc : parameterList.subList(1, 
parameterList.size())) {

Review Comment:
   I gave it a try but I prefer a classic for loop when the body is too complex 
like in this case.
   
   I also considered just using 
`parameterList.stream().skip(1).collect(Collectors.toList())` but it's less 
clear than the original statement, so if you don't feel strongly about this, 
I'd rather keep this part of the code as-is.



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