Jackie-Jiang commented on a change in pull request #4216: PQL -> SQL 
enhancement - phase 1 - new Pinot Query Struct
URL: https://github.com/apache/incubator-pinot/pull/4216#discussion_r291012177
 
 

 ##########
 File path: 
pinot-common/src/main/java/org/apache/pinot/pql/parsers/pql2/ast/InPredicateAstNode.java
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 @@ -92,7 +95,7 @@ public FilterQueryTree buildFilterQueryTree() {
       throw new Pql2CompilationException("IN predicate has no identifier");
     }
 
-    Set<String> values = new HashSet<>();
+    List<String> values = new ArrayList<>();
 
 Review comment:
   Why changing this to list? We can dedup with Set

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