CreateQuery test_tuple_element (children 3)
 Identifier test_tuple_element
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration tuple (children 1)
    DataType Tuple (children 1)
     ExpressionList (children 2)
      NameTypePair k1 (children 1)
       DataType Nullable (children 1)
        ExpressionList (children 1)
         DataType UInt64
      NameTypePair k2 (children 1)
       DataType UInt64
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
  Set
