[GitHub] [calcite] amaliujia commented on a change in pull request #1669: [CALCITE-3590] Support SQL hints for Aggregate

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amaliujia commented on a change in pull request #1669: [CALCITE-3590] Support SQL hints for Aggregate
URL: https://github.com/apache/calcite/pull/1669#discussion_r358978685
 
 

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 File path: core/src/main/java/org/apache/calcite/rel/core/Aggregate.java
 ##########
 @@ -199,9 +227,9 @@ private boolean isPredicate(RelNode input, int index) {
    * Creates an Aggregate by parsing serialized output.
    */
   protected Aggregate(RelInput input) {
-    this(input.getCluster(), input.getTraitSet(), input.getInput(),
-        input.getBitSet("group"), input.getBitSetList("groups"),
-        input.getAggregateCalls("aggs"));
+    this(input.getCluster(), input.getTraitSet(), new ArrayList<>(),
 
 Review comment:
   nit: As the internal data structure is Immutable, you can use `Collections.emptyList()` to create an ImmutableList directly that  using `new ArrayList<>()`.

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