Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5015#discussion_r151408469
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/validate/FunctionCatalog.scala
 ---
    @@ -333,6 +337,10 @@ class BasicOperatorTable extends 
ReflectiveSqlOperatorTable {
         SqlStdOperatorTable.ITEM,
         SqlStdOperatorTable.CARDINALITY,
         SqlStdOperatorTable.ELEMENT,
    +    // MAP OPERATORS
    +    SqlStdOperatorTable.MAP_VALUE_CONSTRUCTOR,
    +    SqlStdOperatorTable.ITEM,
    --- End diff --
    
    ITEM and CARDINALITY are already present.


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