twalthr commented on a change in pull request #18287:
URL: https://github.com/apache/flink/pull/18287#discussion_r786612124



##########
File path: 
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/ExprCodeGenerator.scala
##########
@@ -722,9 +722,9 @@ class ExprCodeGenerator(ctx: CodeGeneratorContext, 
nullableInput: Boolean)
       case ARRAY_VALUE_CONSTRUCTOR =>
         generateArray(ctx, resultType, operands)
 
-      // maps and multisets
-      case MAP_VALUE_CONSTRUCTOR | MULTISET_VALUE =>
-        generateMapOrMultiset(ctx, resultType, operands)
+      // maps
+      case MAP_VALUE_CONSTRUCTOR =>

Review comment:
       @snuyanzin Looking forward to a PR for this commit. Maybe you can also 
address the comment about the value constructor in this PR (using HashMap for 
deduplication of key).




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